Drug	Daily dosage (maximum)	Adult intermittent dosage (maximum)	Duration
Isoniazid*†3	5 mg per kg (300 mg)	15 mg per kg (900 mg per dose) twice per week	Nine months in adults and children (six months may be an alternative treatment duration in adults)
Rifampin (Rifadin)*‡3	10 mg per kg (600 mg)	10 mg per kg (600 mg per dose); daily dosing required when used alone	Four months in adults; six months in children