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Isoniazid is an antibacterial agent used in the treatment and prevention of tuberculosis. Isoniazid acts against actively growing tubercle bacilli.

Isoniazid is an antibiotic used to prevent and treat tuberculosis. It is often used in combination with other drugs to prevent and treat tuberculosis.

Isoniazid is available as 100 mg or 300 mg tablets, as a syrup (50 mg per teaspoonful) or in a 100 mg/ml solution for injection while typically given while hospitalized for treatment. The actual dosage given and frequency of isoniazid is dependent on the patient's weight and age. It usually is taken once a day, on an empty stomach, 1 hour before or 2 hours after meals. Always follow doctor's orders when taking any medication.

It is very important that you follow the prescription carefully. After a few weeks you may feel better but you must continue to take the full course of the drug to avoid a relapse. If at anytime you do not understand how and when the medicine is to be taken, do not be afraid to ask your doctor or pharmacist.

You must be sure to tell your doctor all the medications and even herbal medications you are currently taking, as there may be severe drug interactions while taking Isoniazid. Do not drink alcoholic beverages

If you experience any of the following symptoms, call your doctor immediately: excessive tiredness, weakness, lack of energy, loss of appetite, upset stomach, vomiting, dark yellow or brown urine, yellowing of the skin or eyes, diarrhea, vision problems, numbness or tingling in the hands and feet, a skin rash, fever, swollen glands or sore throat.

Isoniazid may cause an upset stomach. If antacids are used they should not contain aluminum, as the aluminum will affect the absorption of the Isoniazid into the body.

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Do not store in your bathroom as heat and moisture may cause the medication to lose potency.

Throw away any medication that is outdated or no longer needed