Avoid use w/ P-gp inhibitors (eg, ketoconazole, erythromycin, cyclosporine, ritonavir, diltiazem) in patients w/ moderate or severe renal impairment. Pregnancy & lactation. For childn 6-11 yr weighing at least 20 kg, use 10 mg ODT. Should not be used in childn <6 yr & under 20 kg.