Yes, they are a series of meds over 2-3 months if you get regular TB. Resistant TB differs. As I stated, Rifampin being one of the two month series drugs is an ass-whoopin. Huge fatigue and orange urine, not forecast by the doc who gave them too me. Quite a surprise but it hammers your system and all germs in view. Taking it for something as trivial as prophylaxis and having the effects was surprising. Very thorough stuff.