Increased serum theophylline conc; plasma conc of carbamazepine, ranitidine, bismuth (plasma trough conc) & active metabolite of terfenadine; steady-state plasma conc of omeprazole. Decreased steady-state of zidovudine (in HIV-infected adults). Increased mean steady-state C
min & AUC w/ fluconazole (200 mg daily).