So, 2HREZ/4HR3 means isoniazid, rifampicin, Ethambutol, pyrazinamide daily for two months, followed by four months
of isoniazid and rifampicin given three times a week.
The standard"short" course treatment for TB is isoniazid(along with pyridoxal phosphate to obviate peripheral neuropathy caused by isoniazid),
rifampicin(also known as rifampin in the United States), pyrazinamide, and Ethambutol for two months, then isoniazid
and rifampicin alone for a further four months.