Abstract
AimThe effect of switching from lithium immediate release (Li‐IR) to lithium prolonged release (Li‐PR) on lithium‐induced tremor after 1 and 12 weeks of treatment was evaluated in a randomized, multicenter, open trial, in bipolar patients from the participating sites with a tremor severity ≥2 (Udvalg for Kliniske Undersøgelser [UKU] rating scale) despite optimal lithium titration.MethodsThe primary endpoint was the evaluation of tremor by means of the UKU scale after 1 week of treatment. Secondary endpoints included manic Young Mania Rating Scale (YMRS) and depressive symptoms (Montgomery–Asberg Depression Rating Scale), a global assessment of the patient's status (Clinical Global Impression), polyuria/polydipsia (UKU item 3.8) and patient‐reported outcomes.ResultsOwing to difficulties in including suitable patients the enrollment phase was closed when 73 patients were randomized. Notwithstanding the lower number of patients, in the modified intention‐to‐treat population (n = 70) the primary endpoint was statistically significant: tremor improved after 1 week in 62.9% in Li‐PR group against 20.0% of patients in Li‐IR group (p = .0006; two‐tailed Fisher's exact test). The difference remained statistically significant after 4 (p = .0031) and 12 weeks (p = .0128). The same analysis performed in the PP population confirmed these results. Among the secondary endpoints, only the factor convenience of the treatment satisfaction questionnaire showed a statistically significant difference between groups. There were no apparent differences in the safety profile of the two formulations.ConclusionsThis study is the first comparative documentation of a potential benefit of the prolonged‐release formulation in reducing the symptom tremor, a well‐known adverse effect of lithium therapy. Indeed, the study results should be interpreted taking into account the sample size lower than planned.
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