47 rifabutin (used for treating bacterial infections), birth control pills (may not prevent pregnancy when given with VIRACEPT so other birth control methods should be used), calcium channel blockers including bepridil (for the treatment of heart conditions), immunosuppressants including tacrolimus and ciclosporin, sildenafil (for male impotence), statins (used to lower lipid levels in the blood), phenobarbital, phenytoin or carbamazepine (used in the treatment of epilepsy), methadone (used in the treatment of opiate dependence), lansoprazole and other medicines which reduce stomach acid, sedative agents (i.e. midazolam administered by injection).