Do not take w/ lithium due to increased blood levels of lithium. Dose adjustment may be needed w/ chlorpromazine, thioridazine, amisulpride, sulpiride, haloperidol; quinidine, hydroquinidine, disopyramide, amiodarone, sotalol, dofetilide & ibutilide; bepridil; cisapride, diphemanil; antibiotics eg, erythromycin inj, pentamidine, sparfloxacin & moxifloxacin; halofantrine; mizolastine; vincamine inj; NSAIDs eg, ibuprofen, COX-2 inhibitors eg, celecoxib or high doses of ASA; ACE inhibitors eg, captopril, enalapril or perindopril; amphotericin B inj; steroids eg, hydrocortisone, prednisolone, tetracosactide; stimulant laxatives eg, senna & glycerol supp; baclofen; digoxin & digitoxin; K-sparing diuretics eg, amiloride, spironolactone, triamterene; metformin; antidepressants eg, imipramine & neuroleptics; medicines containing Ca; immunosuppressive agents eg, ciclosporin, tacrolimus. Additional precautions may be needed in patients who will undergo X-ray.