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Isoniazid is a medication used to treat and prevent tuberculosis (TB) infections. It works by killing the bacteria that cause TB.

What it is

Isoniazid is an anti-tuberculosis drug. It is used alone or in combination with other medicines to treat active tuberculosis and as preventive therapy in people with latent TB infection.

What it's used for

Isoniazid is indicated for the treatment of all forms of tuberculosis where the bacteria are sensitive to it. It is also recommended as preventive therapy for certain groups, such as those with a positive skin test who are at increased risk of developing active TB.

Common side effects

The most common side effects involve the nervous system and liver. Nervous system effects include peripheral neuropathy (tingling, numbness, or burning in the hands and feet), which is more common in people who are malnourished, have diabetes, or drink alcohol. Other possible effects include nausea, vomiting, and signs of liver problems such as yellowing of the skin or eyes, dark urine, or unusual tiredness.

Important cautions

Do not take isoniazid if you have severe allergic reactions to it, a history of isoniazid-related liver injury, or any acute liver disease. Serious skin reactions (such as Stevens-Johnson syndrome) have been reported; stop the medicine and seek medical help if you develop a rash, blisters, or fever. Your doctor may monitor your liver function during treatment. Avoid alcohol while taking this medicine.

Frequently asked questions

What is isoniazid used for?

Isoniazid is used to treat active tuberculosis (TB) infections and to prevent TB in people who have been exposed to the bacteria or have a positive skin test.

What are the side effects of isoniazid?

Common side effects include numbness or tingling in the hands and feet, nausea, and stomach upset. More serious side effects can include liver damage and severe skin reactions. Seek medical attention if you notice jaundice, dark urine, or a rash.

Can I buy isoniazid without a prescription in Nigeria?

Although this product is listed as over-the-counter, tuberculosis treatment requires medical supervision. You should consult a doctor for proper diagnosis and prescription to ensure safe and effective use.

How is isoniazid taken?

Isoniazid is usually taken once daily by mouth as a tablet. For active TB, it must be combined with other TB medicines. Your doctor will tell you the right dose and duration.

What should I avoid while taking isoniazid?

Avoid drinking alcohol as it increases the risk of liver damage. Also inform your doctor about all other medicines you take, especially those that may affect the liver.

This information is for general guidance only and is not medical advice. Please consult your physician or pharmacist before using any medication.