This medication is used alone to prevent tuberculosis. It is used in combination with other drugs to treat active tuberculosis. Isoniazid is best taken on an empty stomach one hour before or two hours after a meal. If this drug causes nausea , it may be taken with food. If you take an aluminum-containing antacid , make sure it is taken at least one hour after taking isoniazid.
Tuberculosis takes a long time to treat, often over a year.
Take as instructed by your health care provider. Store this medication at room temperature. Do not double your next dose. Tell your health care provider as soon as possible if other symptoms develop. Alcohol also reduces the effectiveness of this medication.