DEFICIENCY STATES, 20-50 MG UP TO 3 TIMES DAILY
ISONIAZID NEUROPATHY, PROPHYLAXIS 10 MG DAILY [OR 20 MG DAILY IF SUITABLE PRODUCT NOT AVAILABLE]; THERAPEUTIC, 50 MG THREE TIMES DAILY.
IDIOPATHIC SIDEROBLASTIC ANAEMIA, 100-400 MG DAILY IN DIVIDED DOSES.
PREMENSTRUAL SYNDROME, 50-100 MG DAILY .