Isoniazid

Isoniazid is a medication primarily used to prevent and treat tuberculosis, a bacterial infection that mainly affects the lungs. It is an important part of the standard treatment regimen for tuberculosis.

By targeting the bacteria causing the infection, isoniazid helps in controlling the spread and severity of the disease.

Information about Isoniazid

Isoniazid Uses

Isoniazid is mainly used in the treatment and prevention of tuberculosis.

Treatment of active tuberculosis infection
Prevention of tuberculosis in individuals exposed to the bacteria
Part of combination therapy for tuberculosis
Management of latent tuberculosis infection

How Isoniazid Works

Isoniazid works by inhibiting the synthesis of mycolic acids, which are essential components of the bacterial cell wall in Mycobacterium tuberculosis.

This action weakens the bacteria, preventing them from growing and multiplying effectively.

As a result, it helps the immune system to control and eliminate the infection.

Common side effects of Isoniazid

Not everyone experiences side effects with isoniazid, and many are mild and temporary.

Nausea
Vomiting
Loss of appetite
Fatigue
Numbness or tingling in hands and feet
Rash

If you experience serious or persistent symptoms, contact your healthcare provider.

CONTENT DETAILS

Written By

Douglas C. Goldberg, MD

Reviewed By

Philip Schein, MD

Last updated

28 Nov 2025 | 03:00 PM (UTC)

Medicine brands for Isoniazid

Isoniazid
Dosage: 300mg
from $36.005 variant(s)

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Expert advice for Isoniazid

Take isoniazid on an empty stomach for better absorption, unless advised otherwise by your doctor.
Avoid alcohol while taking this medication as it may increase the risk of liver damage.
Report any symptoms of liver problems, such as yellowing of the skin or eyes, to your doctor immediately.
Inform your healthcare provider about all other medications you are taking to avoid potential interactions.
Regular monitoring of liver function may be recommended during treatment.

Always consult your doctor for personalized advice and guidance.

Frequently Asked Questions

What is isoniazid used for?

Isoniazid is used for the treatment and prevention of tuberculosis, a bacterial infection that mainly affects the lungs.

How does isoniazid work?

Isoniazid works by inhibiting the synthesis of essential components of the bacterial cell wall, thus preventing the bacteria from growing and multiplying.

Are there any common side effects of isoniazid?

Yes, common side effects include nausea, vomiting, fatigue, and numbness in the hands and feet.

Can I drink alcohol while taking isoniazid?

It is advisable to avoid alcohol as it may increase the risk of liver damage while taking isoniazid.

How should I take isoniazid?

Isoniazid is usually taken on an empty stomach, but follow your doctor’s instructions for the best results.