Isoniazid
Common side effects: Hepatitis, peripheral neuropathy
Uncommon side effects: Cutaneous reactions, arthralgia, drug induced lupus, optic neuritis, convulsions, mental symptoms aplastic anaemia, haemolytic anaemia agranulocytosis, gynaecomastia.
Mycobacterium tuberculosis can survive or a long time in darkness, away from sunlight.Those persons who stay indoors for prolonged periods with a patient of pulmonary TB are most likely to get infected.