Antacids, cetirizine, didanosine, digoxin & colchicine, ergot derivatives, zidovudine, atorvastatin, carbamazepine, cimetidine, coumarin-type oral anticoagulants, ciclosporin, efavirenz, fluconazole, indinavir, methylprednisolone, midazolam, nelfinavir, rifabutin, sildenafil, terfenadine, theophylline, triazolam, trimethoprim/sulfamethoxazole, other antibiotics & medicinal products known to prolong the QT interval.