- Use of vitamin A (>1000 microgram/day), phenytoin, carbamazepine, warfarin, rifampicin, tetracyclines, ketoconazole, itraconazole, astemizole, terfenadine, cisapride, anti-psychotics, anti-depressants, lithium, antimalarials, alpha-blocking drugs, angiotensin-converting enzyme inhibitors, cyclosporin A, glucocorticosteroids and non-steroid anti-inflammatory drugs, non-potassium-sparing diuretics