What does isoniazid do to the body?

Isoniazid is used with other medications to treat active tuberculosis (TB) infections. It is also used alone to prevent active TB infections in people who may be infected with the bacteria (people with positive TB skin test). Isoniazid is an antibiotic and works by stopping the growth of bacteria.Click to see full answer. Keeping this in consideration, which is a serious side effect of isoniazid?Common side effects may include: numbness, tingling, or burning pain in your hands or feet; nausea, vomiting, upset stomach; or. abnormal liver function tests.Additionally, does isoniazid cause weight gain? Headache, poor concentration, weight gain, poor memory, insomnia, and depression have all been associated with isoniazid use. Therefore, isoniazid-induced pyridoxine deficiency causes insufficient heme formation in early red blood cells, leading to sideroblastic anemia. Herein, what are the effects of isoniazid? Common side effects of isoniazid include: numbness and tingling in the extremities, hepatitis (symptoms include loss of appetite, nausea, vomiting, fatigue, malaise, and weakness), nausea, vomiting, upset stomach, fever, or. rash. How long should isoniazid be taken?To help clear up your tuberculosis (TB) completely, it is very important that you keep taking this medicine for the full time of treatment, even if you begin to feel better after a few weeks. You may have to take it every day for as long as 6 months to 2 years. It is important that you do not miss any doses.