What should I avoid while taking isoniazid?

First, you must avoid missing any doses of the TB drug isoniazid. Your doctor should give you a list of foods to avoid if you are taking it. The foods to avoid include: aged cheeses, avocados, bananas, raisins, sour cream, soy sauce, some sausages and meats, including liver; some fish, including skipjack, tropical fish and tuna, beer and red wine. You should restrict alcohol consumption while taking isoniazid because it boosts your risk for liver problems.