Anti-Tubercular Therapy (Isoniazid + Rifampicin + Pyrazinamide + Ethambutol) is a combination tablet used to treat eye conditions caused by tuberculosis bacteria.
| Drug class | Anti-tubercular |
|---|---|
| Type | Combination |
| Forms | Tablet |
| Common strength | Fixed-dose combination |
| Common Indian brands | AKT-4, Forecox, Rcinex, Akurit-4 |
| Prescription status | Prescription |
What Anti-Tubercular Therapy (Isoniazid + Rifampicin + Pyrazinamide + Ethambutol) is used for
This medicine is a combination of four powerful drugs used to treat certain eye conditions that are caused by tuberculosis (TB) bacteria. In India, TB can affect various parts of the body, including the eyes, leading to serious inflammation and vision problems. This therapy is specifically prescribed when your eye doctor suspects or confirms that TB is the underlying cause of your eye condition.
- Tubercular uveitis
- Serpiginous-like choroiditis
- Tubercular retinal vasculitis (Eales’ disease with TB association)
How it works
This combination therapy works by directly targeting and killing the tuberculosis bacteria. These bacteria can sometimes hide inside the delicate structures of your eye, leading to chronic inflammation and damage. By eliminating the bacteria, the medicine helps to reduce inflammation, prevent further damage, and preserve your vision. It’s a comprehensive approach to tackle the infection at its root.
How it’s used
This medicine is a tablet that you take by mouth. The treatment for TB-related eye conditions typically involves two main phases:
- Intensive Phase: This usually lasts for about 2 months. During this phase, you will take the medicine regularly as prescribed by your doctor.
- Continuation Phase: This phase follows the intensive phase and can last for 4 to 7 months. Your doctor will guide you on the exact duration and dosage for this phase.
It is extremely important to take this medicine exactly as your doctor advises, without missing any doses. Do not stop taking the medicine even if your symptoms improve, as stopping early can lead to the TB bacteria becoming resistant to the drugs, making future treatment much harder.
Always follow your ophthalmologist’s exact instructions.
Brands available in India
- AKT-4
- Forecox
- Rcinex
- Akurit-4
Brand availability and pricing vary; confirm with your pharmacist.
Important safety warning
MANDATORY EYE MONITORING. This medicine can damage the retina or optic nerve. Anyone taking it long-term needs baseline and regular eye screening (as advised — often OCT, visual fields and colour vision). Report any change in vision, colour perception or side vision immediately. Damage found late is often permanent.
Precautions & side effects
Taking Anti-Tubercular Therapy requires careful monitoring due to potential side effects. Here are some important precautions:
- IMPORTANT: Ethambutol and Optic Nerve Damage: One of the medicines in this combination, Ethambutol, can cause damage to your optic nerve. This can lead to changes in your vision, such as loss of colour vision (difficulty telling colours apart) or your vision becoming dim.
- Report Vision Changes Immediately: It is CRITICAL that you report ANY change in your vision, colour perception, or side (peripheral) vision to your eye doctor IMMEDIATELY. Do not wait.
- MANDATORY EYE MONITORING: Because of the risk to your vision, your eye doctor will arrange for regular eye check-ups throughout your treatment. This is not optional. These check-ups often include special tests like OCT (Optical Coherence Tomography), visual fields, and colour vision tests. You will need a baseline eye screening before starting the medicine and regular screenings as advised by your doctor.
- Damage Can Be Permanent: Damage to the retina or optic nerve, if found late, is often permanent. This is why strict adherence to eye monitoring and immediate reporting of any changes are so vital.
- Prescription Only: This is a prescription-only medicine. Do not self-medicate or share this medicine with others.
- Highly Relevant in India: TB uveitis is common in India, making these precautions particularly important for patients here.
Understanding Eye Tuberculosis and Your Treatment
Tuberculosis (TB) is a serious infection caused by bacteria called Mycobacterium tuberculosis. While TB is most commonly known to affect the lungs, it can actually spread to almost any part of the body, including the eyes. When TB affects the eyes, it can lead to various inflammatory conditions such as uveitis (inflammation of the middle layer of the eye), choroiditis (inflammation of the choroid, a layer of blood vessels in the eye), or retinal vasculitis (inflammation of the blood vessels in the retina). These conditions, if left untreated, can cause significant vision loss and even blindness.
In India, TB-related eye conditions are relatively common, and early diagnosis and appropriate treatment are crucial for preserving vision. Your doctor at Pristine Eye Hospitals has prescribed Anti-Tubercular Therapy, a combination of four powerful medicines (Isoniazid, Rifampicin, Pyrazinamide, and Ethambutol), specifically because they suspect or have confirmed that TB bacteria are causing your eye problem. This combination is highly effective in killing the TB bacteria that may be hidden within your eye, thereby reducing inflammation and preventing further damage. It’s important to understand that this is a long-term treatment, and your commitment to taking the medicine exactly as prescribed is key to its success.
While this medicine is vital for treating your eye condition, it’s also important to be aware of how it works and what to expect. The goal is not just to treat the symptoms but to eradicate the underlying infection. This comprehensive approach ensures that the TB bacteria are fully eliminated, reducing the risk of recurrence and protecting your precious eyesight. Always communicate openly with your doctor about any concerns or questions you may have throughout your treatment journey.
General Advice for Taking Oral Medicines and Maintaining Eye Health
Taking oral medicines correctly is just as important as taking eye drops or ointments. Always swallow your tablets with a glass of water, unless your doctor advises otherwise. Try to take your medicine at the same time each day to help you remember and to maintain a consistent level of the drug in your body. If you miss a dose, take it as soon as you remember, but do not take a double dose to make up for a missed one. If it’s almost time for your next dose, just skip the missed one and continue with your regular schedule. Never stop taking your medicine without consulting your doctor, even if you feel better. Stopping early can lead to the infection returning and becoming harder to treat.
Maintaining good hygiene is also important during your treatment. Wash your hands thoroughly before and after handling your medicines. Store your tablets in a cool, dry place, away from direct sunlight and out of reach of children. Do not store them in the bathroom, as humidity can affect the medicine’s effectiveness. Always check the expiry date on the packaging and do not use expired medicines.
Beyond your specific medication, general eye care practices can support your overall eye health. Protect your eyes from dust and injury, especially if you are in dusty environments. If you wear glasses or contact lenses, ensure they are clean and your prescription is up to date. Avoid rubbing your eyes excessively, as this can cause irritation or introduce infection. A balanced diet rich in fruits and vegetables, especially those high in vitamins A, C, and E, can also contribute to good eye health.
When to Seek Medical Help
While Anti-Tubercular Therapy is effective, it’s crucial to be vigilant about your health and know when to seek medical attention. As highlighted in the precautions, any changes in your vision, such as blurring, dimming, difficulty seeing colours, or changes in your side vision, must be reported to your eye doctor immediately. These could be signs of a serious side effect related to the medicine. Do not delay in reporting these symptoms, as early detection can prevent permanent damage.
Beyond vision changes, you should also contact your doctor if you experience any other unusual or severe side effects. This could include persistent nausea, vomiting, yellowing of the skin or eyes (jaundice), dark urine, unusual tiredness, or joint pain. While some mild side effects might be expected, anything that causes significant discomfort or concern should be discussed with your healthcare provider. Your doctor at Pristine Eye Hospitals is your best resource for guidance and support throughout your treatment. They are there to monitor your progress, manage any side effects, and ensure the best possible outcome for your eye health. Regular follow-up appointments are essential, so make sure to attend all scheduled visits.
Frequently asked questions
What is Anti-Tubercular Therapy (Isoniazid + Rifampicin + Pyrazinamide + Ethambutol) used for?
This medicine is a combination tablet used to treat specific eye conditions caused by tuberculosis (TB) bacteria, such as tubercular uveitis, serpiginous-like choroiditis, and tubercular retinal vasculitis.
How does this medicine work?
This combination therapy works by directly killing the tuberculosis bacteria that can hide inside your eye and cause chronic inflammation. By eliminating the bacteria, it helps reduce inflammation and prevent further damage to your vision.
What are the common brands of this medicine available in India?
Some common brands of this Anti-Tubercular Therapy combination tablet available in India include AKT-4, Forecox, Rcinex, and Akurit-4.
How should I take this medicine?
This medicine is a tablet taken by mouth. It typically involves an intensive phase of about 2 months, followed by a continuation phase of 4 to 7 months. You must take it exactly as prescribed by your doctor, without missing doses, and never stop treatment early.
Do I need a prescription for this medicine?
Yes, this medicine is a prescription-only drug. You cannot obtain it without a valid prescription from a qualified doctor.
What are the key precautions I need to take while on this therapy?
The most critical precaution is the risk of optic nerve damage from Ethambutol, which can cause loss of colour vision or dimming. You must report any vision changes immediately and undergo mandatory regular eye monitoring (including tests like OCT, visual fields, and colour vision) as advised by your eye doctor. Damage found late can be permanent.
References
- Consensus on Managing Tubercular Uveitis – American Academy of Ophthalmology
- Tuberculous Uveitis – PMC – NIH
- Antitubercular Medications – StatPearls – NCBI Bookshelf
- Eye health – MedlinePlus (US National Library of Medicine)
- Learn about eye health – National Eye Institute (NIH)
Medically reviewed by Dr. C Jagadesh Reddy, Chief Surgeon: Cornea, Cataract and Refractive Surgery — last reviewed 2026-07-28.
This page is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Never self-medicate or reuse an old prescription. Always consult a qualified ophthalmologist before starting, changing or stopping any eye medicine.