Abstract
Management of constipation in patients receiving cyclophosphamide, doxorubicin, vincristine and prednisolone (CHOP) or CHOP-like chemotherapy regimens is important for prevention of paralytic ileus. We reported earlier that the laxative action of magnesium oxide is reversed by the concomitant use of antacids in cancer patients receiving opioid analgesics. Here, we assessed the prevalence of prophylactic laxative medication for the control of constipation in patients receiving CHOP or CHOP-like regimens for non-Hodgkin's lymphoma. Data obtained from 211 eligible patients were retrospectively analyzed. Almost all patients (99%) received anti-ulcer agents such as proton pump inhibitors and H2 receptor antagonists for the prophylaxis of gastric disorders associated with prednisolone. Prophylactic laxatives were prescribed in 86 patients (40.8%), in which magnesium oxide was used most predominantly (88.4%). However, magnesium oxide at doses of ≦2000 mg/d was not effective for prevention of constipation, although the compound totally inhibited the incidence of constipation at doses higher than 2000 mg/d. Therefore, it is important to avoid negative drug interaction between magnesium oxide and antacids in patients receiving CHOP chemotherapy.
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