Immediate-release Dose Research Articles

Pharmacokinetic Prediction of Immediate- and Extended-Release Tablets for Patients with Liver Disease Using Whole Body Physiologically-Based Pharmacokinetic Modeling for the Antipsychotic Drug Quetiapine.

Although quetiapine metabolism occurs extensively in the liver and careful dosing is recommended in patients with liver disease, there has been a paucity of pharmacometric studies to adjust the clinical dose of quetiapine according to liver-disease severity. This study aimed to establish a whole-body, physiologically-based pharmacokinetic (WB-PBPK) model to explain interindividual variability in quetiapine PK and quantitatively predict PK in patients with liver disease. The developed WB-PBPK model well described the PK characteristics of different quetiapine regimens in healthy populations. The PK predictions could also be applied to patients with schizophrenia (without significant differences from healthy subjects). For the same total dose of quetiapine, both immediate-release (IR) and extended-release (ER) tablets showed significantly increased exposure and decreased clearance in patients with liver disease compared to healthy subjects. The model showed that steady-state plasma quetiapine concentrations exceeded the usual therapeutic range after multiple doses of IR tablets 250mg three times daily or ER tablets 800mg once daily in patients with liver disease. Therefore, the doses of quetiapine IR or ER tablets could be reduced by 0.10-0.50 times depending on liver-disease severity, so that mean steady-state plasma concentrations could be positioned near the therapeutic range. WB-PBPK modeling for quetiapine enabled quantitative prediction of PK according to IR or ER formulation and liver-disease severity. The results of this study provide useful data for improving the therapeutic use of quetiapine by enabling dose selection based on formulation and liver-disease severity.

Lacosamide extended-release capsules are bioequivalent to lacosamide immediate-release tablets: Pharmacokinetic observations and simulations

ObjectivesAssess the bioequivalence of lacosamide extended-release (XR) capsules and immediate-release (IR) tablets and answer real-world clinical questions regarding the use of lacosamide XR. MethodsAn open-label, randomized, two-treatment, two-sequence, oral comparative bioavailability study was conducted to assess the bioequivalence of two lacosamide formulations. Participants were randomized 1:1 to receive lacosamide XR capsules (400 mg once-daily) or IR tablets (200 mg twice-daily) in 1 of 2 sequences over 7-day periods. Primary outcome was the area under the lacosamide concentration-time curve over 24 h at steady-state (AUC0-τ,ss). Secondary outcomes were maximum (Cmax,ss) and minimum concentrations at steady-state (Cmin,ss). Bioequivalence was established when 90% confidence intervals (CIs) for geometric least square means ratios (GLSMs) were between 80% and 125%. Adverse events (AEs) and other safety outcomes were also assessed. Pharmacokinetic simulations, including adherent and partially adherent dosing scenarios with XR and IR formulations, modeled the clinical use of lacosamide XR. ResultsThirty-five healthy adult males were enrolled in the bioequivalence study. After 7 days of study drug, mean AUC0-τ,ss, Cmax,ss, and Cmin,ss values were similar between XR and IR formulations; all 90% CIs for GLSMs were between 80% and 125%. AEs were mild and no serious AEs or other clinically significant safety findings were observed. Pharmacokinetic simulations suggested that partial adherence affected formulations similarly; and the best strategy for switching formulations was to take the morning lacosamide IR dose followed by the evening lacosamide XR dose, as this resulted in the most consistent lacosamide plasma concentrations. ConclusionsOnce-daily lacosamide XR capsules were bioequivalent to twice-daily lacosamide IR tablets. Pharmacokinetic simulations indicated lacosamide XR and IR formulations were similarly affected by partial adherence, though once-daily dosing with lacosamide XR may offer clinical advantages, and formulations can be easily switched. These results support the use of lacosamide XR capsules as a once-daily alternative to lacosamide IR tablets.

Pharmacokinetics and pharmacodynamics of a pasireotide subcutaneous depot (CAM4071) and comparison with immediate and long-acting release pasireotide.

To assess the pharmacokinetics, pharmacodynamics, safety and tolerability of subcutaneous depot CAM4071, a novel, ready-to-use pasireotide formulation. This was a phase 1, randomised, open-label study in healthy volunteers. After a single 600 µg dose of pasireotide immediate release (IR), participants were randomised to one of eight groups to receive either a CAM4071 upper thigh (5, 10, 20, 40 or 80 mg) or buttock (20 mg) injection or multiple pasireotide IR 900 µg upper thigh injections twice daily or a single pasireotide long-acting release (LAR) 60 mg intramuscular buttock injection. Ninety-four participants were randomised. For all CAM4071 doses, initial pasireotide release was relatively rapid compared to pasireotide LAR and sustained over the 2-month observation period, with a slow decay in plasma concentrations. CAM4071 maximum plasma concentrations increased slightly greater than dose proportionally; area under the curve extrapolated to infinity increased approximately dose proportionally. Relative bioavailability of pasireotide for different doses of CAM4071 versus pasireotide IR 600 μg ranged from 0.752 (90% confidence interval [CI]: 0.58, 0.98) to 1.68 (1.32, 2.14), and versus pasireotide LAR: 0.517 (0.37, 0.72) to 1.15 (0.84, 1.58). CAM4071 doses >5 mg exhibited rapid initial reductions of insulin-like growth factor 1 (IGF-1) compared to pasireotide LAR. Maximum IGF-1 inhibition was greatest for CAM4071 80 mg. CAM4071 injections ≤40 mg were well tolerated and comparable with currently available pasireotide formulations. CAM4071 provided long-acting release of pasireotide over at least one month, with high bioavailability and onset and duration of IGF-1 suppression similar to pasireotide LAR. EudraCT: 2014-003783-20.

P571 The Effect of NLRX1 Activation on Eosinophils in Ulcerative Colitis and Inflammation: Translational Learnings Across Diseases and from Mouse to Human

Abstract Background Although the precise role of eosinophils in IBD is debated, elevated eosinophils may influence response to therapy and clinical outcomes1. Thus, therapeutic agents which affect both neutrophil and eosinophil recruitment may provide more robust clinical improvement in patients with UC. NLRX1 is an immunometabolic protein which reduces oxidative stress, shifts cellular metabolism, and decreases inflammation in multiple cell types implicated in ulcerative colitis (UC). Studies of NLRX1 agonists (gut-selective NX-13 & systemic LABP-73) in diverse disease models identified novel cellular targets of NLRX1 activation. We compared NLRX1’s effect on eosinophils in 2 disease states, UC and the more prototypical eosinophilic disease, asthma, and evaluated the findings. Methods In the 4-week NX-13 Phase 1b, a double-blind trial of 36 patients with active UC (Total Mayo Score 4-10; Mayo endoscopic subscore 2-3) who were randomly assigned to NX-13 250mg Immediate Release (IR), 500mg IR, 500mg Delayed Release (DR) or Placebo QD for 4 weeks, histology was assessed using the Geboes score by a blinded pathologist2. For allergic asthma models, mice were immunized with ovalbumin or house dust mite followed by antigen challenge concurrent with LABP-73 or vehicle. Cells isolated from the lung were analyzed by flow cytometry using the BD FACS Celesta/Diva. Data are represented as means (standard error). Results In the 1b clinical trial, both the Geboes score and neutrophil subscores were reduced in the IR NX-13 group compared to placebo, consistent with the effects seen in preclinical IBD models. Upon examination, eosinophil infiltration was reduced in both the IR dose cohorts compared to placebo (Fig1A). In the subset of patients with active eosinophil infiltration at baseline (defined as Geboes subscore ≥2A.1), eosinophil reduction was seen in all NX-13 doses (Fig1B). Importantly, a numerically increased clinical response rate (decrease in total Mayo score of ≥3 or ≥30%) was seen in patients that demonstrated effective eosinophil reduction, compared to patients without improvement (75% versus 29%; Fisher’s Exact Test, p=0.08). In two allergic asthma models, NLRX1 activation by LABP-73 significantly reduced the fraction of eosinophils within the lung relative to vehicle control (n=7-8; p< 0.05), confirming NLRX1 activation can regulate eosinophilic inflammation in Th2-mediated responses. Conclusion Neutrophil and eosinophil infiltration were reduced in UC patients treated with the gut selective NLRX1 agonist, NX-13, and was coupled with better clinical outcomes. The effect of NX-13 on eosinophils will be evaluated further in the ongoing phase 2 NEXUS trial in patients with UC. 1 A Mookhoek, et al. JCC (16). 2 L Peyrin-Biroulet, et al. JCC (17) Supp

Physiologically based pharmacokinetic and pharmacodynamic modelling of alprazolam: Implications for anxiety and addiction.

Alprazolam is an anxiolytic compound that can lead to psychological and physiological dependence especially with prolonged use. This study utilized physiologically based pharmacokinetic (PK) and pharmacodynamic (PD) modelling to further examine the underlying mechanisms of anxiety treatment and addiction. Data and parameter values for this study were obtained from PubMed and DrugBank literature searches. The physiologically based PK models for alprazolam were developed using PK-Sim software and PD models were implemented with the MonolixSuite 2021R platform. After single administrations, peak unbound interstitial brain concentrations range from 4 to 33 nM for 0.25-2mg-doses of the immediate-release form and 3-54 nM for 0.5-10-mg doses of the extended-release form. With repetitive administrations, peak concentration is 59 nM for a 2-mg alprazolam immediate-release dose and 122 nM for a 10-mg extended-release dose. Potentiation of EC10 GABA-gated currents from recombinant GABAA Rs composed of α1β2γ2, α2β3γ2 and α5β3γ2 subunit combinations is 92, 150 and 75%, respectively, for an alprazolam concentration of 59 nM. The 10-90% rise times for the brain concentration-time profile following a single 1-mg immediate-release administration is 22.8min and 3.8h for a 3-mg extended-release administration. Unbound interstitial brain concentration-time profiles of alprazolam corresponded to changes in β rhythm activity, peak saccade velocity, mood improvement, cognitive speed slowing and digit symbol substitution test scores. PD models for these endpoints suggest that alprazolam immediate-release maximal effects on cognitive slowing, cognitive impairment, sedation and mood improvement occur sequentially following the brain concentration-time profile.

P577 A Phase 1b Study to Evaluate Safety, Tolerability, Pharmacokinetics and Clinical Efficacy of the Nucleotide-binding oligomerization domain, Leucine rich Repeat containing X1 (NLRX1) agonist NX-13 in Ulcerative Colitis

Abstract Background NLRX1 is a mitochondrial membrane protein whose activation reduces oxidative stress and decreases effector cell differentiation and cytokine release. NX-13 is a first-in-class, orally active, gut selective NLRX1 agonist with low systemic exposure. In preclinical studies of IBD, NX-13 effectively reduced inflammatory responses and disease severity. A phase 1a study (healthy subjects) showed NX-13 to be well tolerated with low systemic drug exposure suggesting a gut-selective drug delivery. We report the results of a phase 1b study in patients with Ulcerative colitis (UC) on the safety, target engagement and clinical efficacy of NX-13. Methods In this double-blind trial, 36 patients with active UC (Total Mayo Score [MCS] 4-10; Mayo endoscopic subscore [MES] 2-3) were randomly assigned to NX-13 250mg Immediate Release (IR), 500mg IR, 500mg Modified Release (MR) or Placebo to be taken QD for 4 weeks (safety visit at week 5). Biologic exposed patients, stable 5’ASAs dose and corticosteroids (oral ≤20mg/day prednisone or equivalent) were permitted. IV or topical corticosteroids use was prohibited. Primary endpoints were safety and pharmacokinetic (PK) analysis. The study was not powered for clinical efficacy, however MCS, histopathologic Geboes score, and NLRX1, cytokine, and gene expression were obtained at baseline and day 28 in exploratory analyses (Table 1). Results During the 5-week observation period, no serious adverse events (AEs) were reported. All AEs were classified as mild or moderate and were most common in the 500mg MR group. One patient was withdrawn before week 5 due to a flare of UC. IR dose plasma PK levels peaked at 1hour, while the MR dose was absorbed later and maintained a low exposure longer. Qualitative immunohistochemical analysis showed target engagement as indicated by increase of NLRX1 at all doses. Symptomatic efficacy was seen in 8/11 patients in the 250mg group with a PRO (RB+SF) score of 0 at week 4. The decrease in MCS was 2.1-3.4 in the NX-13 arms vs 1 point with placebo (Fig 1A) while clinical response rates ranged from 27-72% amongst the active arms with no placebo responders, though no dose-response relationship was observed (Fig 1B). Endoscopic response ranged from 27-40% (Fig 1C), with 5/32 dosed patients being in endoscopic remission. Histologic remission largely paralleled endoscopic response and cytokine and mRNA levels support target engagement. Conclusion In patients with active UC, NX-13 was well-tolerated and target engagement was achieved. The exploratory efficacy endpoints indicated rapid clinical, endoscopic, and histologic improvement at week 4, relative to placebo. This novel mechanism of action will be further evaluated in a phase 2 study.

Population pharmacokinetic analysis of acetaminophen overdose with immediate release, extended release and modified release formulations

Objectives The introduction of delayed release formulations of acetaminophen (APAP) has created concern about the role of formulation in overdose. We examined the APAP overdose pharmacokinetic (PK) profiles to assess the role of dose, coingestants and formulation: immediate release (IR), extended release (ER), and modified release (MR) on APAP pharmacokinetic measures. Methods We collected by-subject APAP PK data: subject description, timed blood APAP concentrations, dose, and coingestants. We sought both overdose and randomized controlled trials (RCTs) for supratherapeutic doses involving ER or MR formulations. Data analysis and simulation used the non-linear mixed-effects modeling program NONMEM-version 7.4. Results The final dataset comprised 3,033 [APAP] from 356 subjects and 15 sources including 3 RCTs (179 subjects receiving IR, 122 ER, 65 MR). The final population PK (PopPK) model was a linear 2-compartment model with first-order (oral) absorption. Covariate relationships included: APAP absorption rate and bioavailability decreased with increased oral dose (p < 0.00005) for all 3 formulations (MR > ER > IR). Post hoc analyses showed opioid coingestant increased exposure (area under the curve, AUC) by factor of 1.6. Simulations of 100 g vs 10 g doses for IR, ER and MR showed overdose of the ER formulation exhibits slower absorption and lower C max, overall exposure (AUC) is less than 80% of an equivalent dose of IR acetaminophen. The overall exposure for the MR formulation is less than 70% of an equivalent dose of IR. Conclusions Acetaminophen ER and MR formulations have slower absorption and decreased bioavailability leading to a lower C max and later T max than the IR formulation. These results have potential clinical implications because delayed absorption could confound use of the Rumack-Matthew nomogram by underestimating the severity of ingestion early in the course of treatment.

Abstract CT236: A Two-Part Phase 2 Study of Itacitinib Immediate Release in Patients with Primary or Secondary Myelofibrosis Who Have Received Prior Ruxolitinib and/or Fedratinib Monotherapy

Abstract Background: Ruxolitinib (JAK1/JAK2 inhibitor) and fedratinib (JAK2/FLT3 inhibitor) are indicated in the US for myelofibrosis (MF); however, some patients fail to achieve adequate/sustained response to initial JAK-inhibitor therapy. Itacitinib is a potent JAK inhibitor selective for JAK1 over JAK2 when administered as a once-daily sustained-release (SR) formulation. In prior clinical trials, the SR formulation improved MF-related symptoms but had less effect with respect to spleen volume reduction. When dosed as a twice-daily (BID) immediate release (IR) formulation, itacitinib may offer increased JAK2 inhibition (in addition to JAK1 inhibition) to better address the JAK2-mediated myeloproliferative features of MF. This open-label phase 2 study is designed to determine a tolerable and safe dose of itacitinib IR that results in clinically significant reductions in symptoms and spleen volume in patients with MF who have previously received ruxolitinib and/or fedratinib monotherapy (INCB 39110-213; NCT04629508). Methods: Eligible patients are aged ≥18 years, diagnosed with at least INT-1 risk (Dynamic International Prognostic Scoring System [Passamonti. Blood. 2010;115:1703-1708]) primary or secondary (post-polycythemia vera or post-essential thrombocythemia) MF and have received ruxolitinib and/or fedratinib monotherapy. Patients must also have palpable splenomegaly and platelets ≥50×109/L at screening. Exclusion criteria include receipt of a JAK inhibitor other than ruxolitinib or fedratinib, ≥10% myeloid blasts in peripheral blood or bone marrow, or inability to taper ruxolitinib/fedratinib over 14 days without use of other agents. Two itacitinib IR dose levels (DLs) will be evaluated in part 1 following a Bayesian optimal interval design algorithm: 3-9 patients will be enrolled at DL1 (300 mg BID) and observed for 28 days for dose-limiting toxicity before enrollment at DL2 (600 mg BID). Part 2 will enroll ~55 patients at the recommended phase 2 dose (RP2D) determined in part 1. Patients may remain on treatment until week 48 if they are receiving clinical benefit and have not met study withdrawal criteria. A safety follow-up will occur 30 days after treatment completion. Primary objectives: part 1 - evaluate safety and tolerability of itacitinib IR and select the RP2D; part 2 - evaluate efficacy of itacitinib IR at the RP2D based on spleen volume reduction at week 24. Secondary objectives (part 2 only): evaluate safety and tolerability of itacitinib IR; evaluate efficacy of itacitinib IR with respect to MF symptom improvement at week 24 in patients with baseline total symptom score ≥10, quality-of-life improvement, and patient global impression of change. Sites are opening in the US and EU. Citation Format: Andrew T. Kuykendall, Lea Burke, Mani Lakshminarayanan, Philomena Colucci. A Two-Part Phase 2 Study of Itacitinib Immediate Release in Patients with Primary or Secondary Myelofibrosis Who Have Received Prior Ruxolitinib and/or Fedratinib Monotherapy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr CT236.

Population pharmacokinetics of immediate-release and modified-release paracetamol and its major metabolites in a supratherapeutic dosing study

Objectives Overdose with paracetamol modified-release (MR) formulation, a bilayer tablet containing 69% slow-release component, has been increasing since its introduction to the market. However, little evidence exists for the management of MR paracetamol overdose. We aimed to develop a population pharmacokinetic (PK) model for immediate-release (IR) and MR paracetamol and its major metabolism, and quantitatively understand the formulation difference in toxicity assessment based on the nomogram line. Methods Data from a cross-over study design in nine healthy volunteers administered a single supratherapeutic oral dose (80 mg/kg) of either IR and MR paracetamol were available from a published study. Plasma concentrations for paracetamol and its metabolites glucuronide (APAPG) and sulfate conjugate (APAPS) for both formulations were measured and analysed with population pharmacokinetic (PK) method using NONMEM. Toxicity in both formulations was assessed by comparing the simulated paracetamol concentrations under different paracetamol dose levels with the 150 mg/L nomograms. The difference in the assessment was compared between the two formulations. Results Paracetamol concentrations for the IR formulation were described with a two-compartment model with first-order input and a lag time. The delayed time-course of MR paracetamol concentrations was best captured by a parallel absorption model in which the slow-release component was a serial zero-order then the first-order process. The formation of APAPG was linear, while APAPS concentrations were best fitted by a Michaelis-Menten process. The relative bioavailability of MR paracetamol compared to IR () was estimated as 0.81. The simulated probability of making different toxicity assessments based on nomogram line was increased with dose levels and was as high as 14.6% after 22 g IR or MR paracetamol ingested. Conclusions A joint parent-metabolite model to describe time-course profiles of both IR and MR paracetamol and its metabolites APAPG and APAPS concentrations was developed. Simulations from the model showed that toxicity assessment based on the 150 mg/L nomograms is not suitable in MR paracetamol overdoses.

Real-World Experience with Carbidopa-Levodopa Extended-Release Capsules (Rytary®): Results of a Nationwide Dose Conversion Survey.

Background The introduction of carbidopa-levodopa extended-release (CD-LD ER) capsules (Rytary®) did not go as smoothly as expected, largely due to difficulty around dose conversion from available immediate-release (IR) levodopa (LD) formulations. The dose conversion table in the CD-LD ER prescribing information was similar to the table used in the pivotal clinical trial and is considered by many prescribing HCPs to be less than optimal. By the end of the dose conversion period in that trial, dosing in 76% of subjects was adjusted for symptom control; roughly 60% of patients required a higher dose and about half required more frequent administration than the recommended TID dosing. Objective The primary objective of our nationwide (US) survey was to determine the dose conversion strategy most commonly employed by CD-LD ER frequent prescribers. The survey also aimed to explore additional features regarding CD-LD ER use in clinical practice. Methods A survey consisting of 21 multiple-choice questions was developed and administered to experts in the use of CD-LD ER, based on prescription volume. Results Of the 394 HCPs who were invited to participate, 90 (23%) HCPs completed the survey. All respondents were aware of the dose conversion table; the largest group did not find the table to be helpful and did not use it to convert patients to CD-LD ER. The most common strategy in calculating the CD-LD ER dose was based on the total daily LD IR dose, with the majority of that group initiating dose conversion by doubling the total daily LD dose from CD-LD IR and administering CD-LD ER one less time per day. Conclusion Overall, most survey respondents agreed that a good starting point for CD-LD ER conversion could be doubling the daily LD IR dose and administering it one time less frequently. Moreover, rapid patient follow-up after initial dose conversion to allow for further dose adjustments plays a critical role in achieving success. Gaining experience over time is important for satisfactory conversion.

Effect of Gliclazide or Gliclazide plus Metformin Combination on Glycemic Control in Patients with T2DM in India: A Real-World, Retrospective, Longitudinal, Observational Study from Electronic Medical Records.

BackgroundThe efficacy of gliclazide has been reported in clinical trials in India. However, real-world data on the effectiveness of gliclazide in India is unavailable.ObjectiveTo provide real-world evidence regarding the effectiveness of gliclazide or gliclazide + metformin fixed-dose combination or separate medications, used either as monotherapy or as the latest add-on to other antihyperglycemic agents in reducing glycated hemoglobin (HbA1c) levels in Indian patients with type 2 diabetes mellitus (T2DM).MethodsElectronic medical record data of adult patients who were diagnosed with T2DM who were newly initiated on or had been prescribed gliclazide or gliclazide + metformin combination for < 30 days as monotherapy or as add-on therapy to other antihyperglycemic agents, and had HbA1c ≥ 6.5% were retrospectively analyzed. Mean change in HbA1c from baseline was the primary endpoint. Secondary endpoints were assessment of dosages and formulations of gliclazide or gliclazide + metformin prescribed in the HbA1c spectrum and antihyperglycemic agents to which gliclazide or gliclazide + metformin was added as an adjunct. Readings were obtained before initiating gliclazide or gliclazide + metformin and after at least 90 days of treatment with gliclazide or gliclazide + metformin.ResultsIncluded patients (n = 498) were categorized into gliclazide only (n = 66), gliclazide + metformin only (n = 179), gliclazide add-on (n = 169), and gliclazide + metformin add-on (n = 84) groups. Mean (95% confidence interval [CI]) change in HbA1c among patients with baseline HbA1c > 7% was − 0.8% (− 1.26, − 0.34) in gliclazide only group; − 1.6% (− 1.89, − 1.31; p < 0.001) in gliclazide + metformin group; − 1.2% (− 1.50, − 0.90; p < 0.001) in add-on gliclazide group; and − 1.4% (− 1.75, − 1.05; p < 0.001) in add-on gliclazide + metformin group. Gliclazide once daily was the most prescribed regimen in the gliclazide only group (72.7%), with 60 mg being the most prescribed modified-release dose (62.5%). Gliclazide + metformin twice daily was the most prescribed regimen in the gliclazide + metformin group (69.3%) with 80 mg + 500 mg being the most prescribed immediate-release dose (62.9%). Gliclazide and gliclazide + metformin were most added as an adjunct to existing prescriptions of biguanides (83.4%) or insulin (64.3%), respectively.ConclusionGliclazide or gliclazide + metformin prescribed as mono- or add-on therapy during routine clinical practice effectively reduced HbA1c in Indian patients with T2DM, thus validating the use of gliclazide and gliclazide + metformin for managing T2DM in India.

Changing the Drug Delivery System: Does It Add to Non-Compliance Ramifications Control? A Simulation Study on the Pharmacokinetics and Pharmacodynamics of Atypical Antipsychotic Drug.

This study investigates the pharmacokinetic (PK) and pharmacodynamic (PD) consequences of shifting from Quetiapine fumarate immediate-release (IR) to extended-release (XR) formulation in non-adherent schizophrenia patients. Monte-Carlo simulations using population PK and PD models were implemented to predict the time course of plasma concentration and Brief Psychiatric Rating Scale (BPRS) scores following the oral administration of 200 mg Seroquel® every 12 h and 400 mg Seroquel XR® every 24 h in patients experiencing dose delay, omission or doubling. Parameters were computed and their distributions were compared using the Kolmogorov–Smirnov test. Dose irregularities with both formulations had different effects on plasma concentration and %reduction in BPRS scores from baseline. However, the odds ratio of getting a %reduction in BPRS below 14%, or plasma concentration exceeding 500 µg/L, were comparable for adherent and non-adherent patients. Plasma therapeutic concentration after treatment cessation was maintained for <24 h in 48% and 29.6% of patients, and a steady state recovery time of <48 h was achieved in 51% and 13.4% of patients on the IR and XR formulations, respectively. Monte-Carlo simulations predict that the risks associated with the IR dose irregularities are not worsened when the XR formulation is used instead. Non-adherence events involving a single dose of either formulation do not require rescue doses.

Segmental-Dependent Solubility and Permeability as Key Factors Guiding Controlled Release Drug Product Development.

The main factors influencing the absorption of orally administered drugs are solubility and permeability, which are location-dependent and may vary along the gastrointestinal tract (GIT). The purpose of this work was to investigate segmental-dependent intestinal absorption and its role in controlled-release (CR) drug product development. The solubility/dissolution and permeability of carvedilol (vs. metoprolol) were thoroughly studied, in vitro/in vivo (Octanol-buffer distribution coefficients (Log D), parallel artificial membrane permeability assay (PAMPA), rat intestinal perfusion), focusing on location-dependent effects. Carvedilol exhibits changing solubility in different conditions throughout the GIT, attributable to its zwitterionic nature. A biorelevant pH-dilution dissolution study for carvedilol immediate release (IR) vs. CR scenario elucidates that while the IR dose (25 mg) may dissolve in the GIT luminal conditions, higher doses used in CR products would precipitate if administered at once, highlighting the advantage of CR from the solubility/dissolution point of view. Likewise, segmental-dependent permeability was evident, with higher permeability of carvedilol vs. the low/high Peff marker metoprolol throughout the GIT, confirming it as a biopharmaceutical classification system (BCS) class II drug. Theoretical analysis of relevant physicochemical properties confirmed these results as well. A CR product may shift the carvedilol’s solubility behavior from class II to I since only a small dose portion needs to be solubilized at a given time point. The permeability of carvedilol surpasses the threshold of metoprolol jejunal permeability throughout the entire GIT, including the colon, establishing it as a suitable candidate for CR product development. Altogether, this work may serve as an analysis model in the decision process of CR formulation development and may increase our biopharmaceutical understanding of a successful CR drug product.

Efficacy and Safety of Tapentadol Immediate Release for Acute Pain: A Systematic Review and Meta-Analysis.

Tapentadol (TAP) immediate release (IR) is a newer opioid option for acute pain. The aim of this systematic review was to examine the efficacy and safety of TAP IR compared with other opioids for acute pain. A systematic literature search as conducted using the Cochrane Library, Embase, International Pharmaceutical Abstracts, MEDLINE, PubMed, and Web of Science. The search included all randomized controlled trials and observational studies examining TAP IR versus other orally administered IR opioids for acute pain. The protocol for this study was registered on PROSPERO (CRD42018110267). Thirteen studies and 1 abstract were included in the systematic review (n=12,814 patients). Of these, 5 studies and 1 abstract were included in the qualitative review (n=9108 patients). Eight randomized controlled trials (n=3706 patients) comparing 50 to 100 mg TAP IR versus 5 to 15 mg oxycodone IR were included in the meta-analysis. The lowest dose of TAP IR (ie, 50 mg) was associated with less pain control compared with oxycodone IR (standardized mean difference=0.25, 95% confidence interval: 0.06-0.44, P<0.01). However, there were no significant differences at higher doses (ie, 75, 100 mg, or when a titration strategy was used). In the qualitative analysis, pain control with TAP IR was also similar to morphine IR and tramadol IR. TAP IR was less likely to have gastrointestinal adverse effects such as nausea and constipation compared with other opioids. TAP IR is as effective as other opioids at higher doses for acute pain and is associated with fewer gastrointestinal adverse effects. On the basis of these findings, TAP IR can be considered as a first-line opioid for acute pain.

Bioavailability and Pharmacokinetics of Once-Daily Amantadine Extended-Release Tablets in Healthy Volunteers: Results from Three Randomized, Crossover, Open-Label, Phase 1 Studies.

IntroductionIn February 2018, OS320—an amantadine extended-release (ER) tablet formulation with once-daily morning administration—was approved for the treatment of Parkinson’s disease and drug-induced extrapyramidal reactions in adults. The purpose of this study was to describe three phase 1 studies that assessed the pharmacokinetics (PK) and bioavailability of amantadine ER in healthy adult volunteers.MethodsStudy 1 was an open-label, four-treatment, single-dose, crossover study comparing amantadine ER 129, 193, and 258 mg tablets with an equivalent dose of immediate-release (IR) amantadine 40 mg/5 mL syrup. Study 2 was an open-label, single-dose, crossover food-effect study with amantadine ER 258 mg. Study 3 was an open-label, multiple-dose, crossover study comparing amantadine ER and amantadine IR syrup.ResultsAmantadine ER displayed a steady release of amantadine, with the peak amantadine concentration occurring at ~ 7.5 h postdose or in the middle of the day (following a morning dose) with steady-state administration. Administration of amantadine ER 258 mg with a high-fat meal did not affect amantadine bioavailability. Amantadine plasma exposure increased proportionally with increasing doses, and at steady state, amantadine exposure from an amantadine ER 258-mg tablet was bioequivalent to twice-daily 129-mg amantadine IR syrup.ConclusionThe PK profile of amantadine ER 129-mg, 193-mg, and 258-mg tablets allows for once-daily dosing in the morning; the 24-h average amantadine plasma concentration is equivalent to that for the same daily dose of IR amantadine administered twice daily.FundingOsmotica Pharmaceutical US LLC.

Pharmacokinetics, safety, and efficacy of tapentadol oral solution for treating moderate to severe pain in pediatric patients.

Background: This trial is part of the global pediatric clinical development program investigating the administration of the strong analgesic tapentadol in children and adolescents.Patients and methods: The single site, open-label phase 2 trial evaluated the pharmacokinetic profile of tapentadol and its major metabolite, tapentadol-O-glucuronide, as well as safety and tolerability and efficacy of a single dose of tapentadol oral solution (1 mg/kg) in patients (2 to <18 years) undergoing dental, ear, nose, or throat surgery. Blood sampling and pain intensity measurements were conducted using age-appropriate schedules and rating scales, respectively. Adverse events were monitored throughout the trial.Results: Sixty-six patients were treated. They were stratified by age: Group 1 (12 to <18 years), n=21; Group 2 (6 to <12 years), n=28; and Groups 3 (3 to <6 years) and 4 (2 to <3 years), n=17. Serum tapentadol concentrations observed in these pediatric patients were within the range observed in adults after administration of a single tapentadol immediate-release dose (50–100 mg), whereas those of the metabolite tapentadol-O-glucuronide were within the same range or lower than in adults who received comparable single doses of tapentadol. Pain intensity improved over time across all age groups. The most common treatment-emergent adverse events were nausea (24.2%), vomiting (16.7%), dizziness (9.1%), and headache (6.1%).Conclusion: A single dose of tapentadol oral solution (1 mg/kg) administered to pediatric patients (2 to <18 years) resulted in serum tapentadol concentrations within the targeted range shown to be safe and efficacious in adults. Tapentadol demonstrated good tolerability and safety; within the limitations of the trial design, improvements in postsurgical pain intensity were observed across the age groups. Tapentadol may provide a new treatment option in the management of moderate to severe pediatric pain.

Effect of Roux-en-Y gastric bypass on the bioavailability of metoprolol from immediate and controlled release tablets: a single oral dose study before and after surgery

ObjectiveRoux-en-Y gastric bypass (RYGB) surgery induces major changes in the gastrointestinal tract that may alter the pharmacokinetics of orally administered drugs. Results from pharmacokinetic studies are sparse. This study aimed...

A Phase 1b Study of Oprozomib with Dexamethasone or Pomalidomide and Dexamethasone in Patients with Relapsed or Refractory Multiple Myeloma

A Phase 1b Study of Oprozomib with Dexamethasone or Pomalidomide and Dexamethasone in Patients with Relapsed or Refractory Multiple Myeloma

Efficacy and safety of febuxostat extended release and immediate release in patients with gout and moderate renal impairment: phase II placebo-controlled study

BackgroundFebuxostat immediate release (IR), a xanthine oxidase inhibitor, is indicated for the management of hyperuricemia in patients with gout by lowering urate levels. An extended release (XR) formulation of febuxostat was developed to provide equal or superior efficacy on urate lowering compared with the IR formulation and potentially lower the risk of treatment-initiated gout flares due to an altered pattern of drug exposure. The present study evaluated the efficacy and safety of febuxostat XR and IR formulations in patients with gout and moderate renal impairment (estimated glomerular filtrate rate ≥ 30 and < 60 ml/min).MethodsThis was an exploratory, 3-month, phase II, multicenter, placebo-controlled, double-blind proof-of-concept study. Patients (n = 189) were randomized 1:1:1:1:1 to receive placebo or febuxostat IR 40 mg, XR 40 mg, IR 80 mg, or XR 80 mg once daily. Endpoints included: proportion of patients with serum uric acid (sUA) < 5.0 mg/dl at month 3 (primary endpoint), proportion of patients with sUA < 6.0 mg/dl at month 3, and proportion of patients with ≥ 1 gout flare requiring treatment over 3 months.ResultsAt month 3, all febuxostat treatment groups were associated with greater proportions of patients achieving sUA < 5.0 mg/dl (p < 0.05 vs placebo). A greater proportion of patients receiving XR 40 mg achieved sUA < 5.0 mg/dl versus those receiving IR 40 mg (p = 0.034); proportions were similar in the IR 80 mg and XR 80 mg groups. Higher proportions of febuxostat-treated patients achieved sUA < 6.0 mg/dl at month 3 (p < 0.05 vs placebo) and experienced ≥ 1 gout flare (significant for all comparisons, except XR 40 mg). Incidences of treatment-related adverse events were low across all treatment groups; the majority were mild or moderate with no apparent trends correlating with IR or XR doses. The most common treatment-emergent adverse event was hypertension. One death (unrelated to the study drug) was reported.ConclusionsThese exploratory data demonstrate that febuxostat (XR and IR) formulations were effective and well tolerated in patients with gout and moderate renal impairment.Trial registrationClinicalTrials.gov, NCT02128490 Registered on 29 April 2014.

Exenatide effects on gastric emptying rate and the glucose rate of appearance in plasma: A quantitative assessment using an integrative systems pharmacology model

This study aimed to quantify the effect of the immediate release (IR) of exenatide, a short-acting glucagon-like peptide-1 (GLP-1) receptor agonist (GLP-1RA), on gastric emptying rate (GER) and the glucose rate of appearance (GluRA), and evaluate the influence of drug characteristics and food-related factors on postprandial plasma glucose (PPG) stabilization under GLP-1RA treatment. A quantitative systems pharmacology (QSP) approach was used, and the proposed model was based on data from published sources including: (1) GLP-1 and exenatide plasma concentration-time profiles; (2) GER estimates under placebo, GLP-1 or exenatide IR dosing; and (3) GluRA measurements upon food intake. According to the model's predictions, the recommended twice-daily 5- and 10-μg exenatide IR treatment is associated with GluRA flattening after morning and evening meals (48%-49%), whereas the midday GluRA peak is affected to a lesser degree (5%-30%) due to lower plasma drug concentrations. This effect was dose-dependent and influenced by food carbohydrate content, but not by the lag time between exenatide injection and meal ingestion. Hence, GER inhibition by exenatide IR represents an important additional mechanism of its effect on PPG.