course treatment
for active
TB is isoniazid, rifampicin, pyrazinamide, and ethambutol
for two months, then isoniazid and rifampicin alone for a further four months. The patient is considered cured at six months (although there is still a relapse rate of 2 to 3%).
2HREZ/4HR3
means isoniazid(H), rifampicin(R), ethambutol(E), pyrazinamide(Z) daily for two months, followed by four months of isoniazid and rifampicin given three times a week.
http://en.wikipedia.