The question is why are you taking Isoniazid
? Is it for prophylaxis or is it part of tuberculosis
regimen ? Yes Isoniazid has liver
toxicity but not in all patients .. Only some patients develop raised liver enzymes because of isoniazid. Do have an underlying liver disease ? If not there is nothing to worry. Go for a baselne Liver function test and repeat it after three months , if the ALT
and AST has not increased by > 3 times the upper limit of normal then there is nothing to worry. You dont need to take any other medications to prevent liver toxicity.