Ethambutol: Uses, Dosage, Side Effects, Precautions and Price in India

Ethambutol is an antitubercular medicine used, together with other drugs, to treat tuberculosis (TB). This guide covers ethambutol uses, how it works, dosage, side effects, precautions, brand names and its approximate price in India.

At a Glance

What is Ethambutol?

Ethambutol is an antitubercular drug used to treat tuberculosis (TB). It is used in combination with other drugs, and it is not used alone for active TB. Its role is mainly to help prevent and delay the emergence of resistant strains.

Not every person with TB automatically needs ethambutol. Treatment depends on the type of TB, drug susceptibility or resistance pattern, age, and the treatment protocol followed by the treating doctor.

How Ethambutol Works

Ethambutol interferes with cell-wall synthesis in Mycobacterium tuberculosis, the bacteria that cause TB. This prevents their growth and spread.

Uses of Ethambutol

• Tuberculosis (TB): Part of combination therapy for active TB, in regimens where the treating doctor includes it.

Ethambutol Dosage (General Reference Information)

The doses below are general reference only. Take ethambutol only as prescribed by your doctor.

This section is general reference information. It is not a dosing guide and must not be used for self-medication. Ethambutol dosing varies with the TB treatment regimen, age, weight, kidney function, and the TB programme or protocol being followed. The figures below come from different sources and are not one universal dosing rule. Do not start, stop, or change your dose yourself.

India (NTEP / programme context)

Under India’s National TB Elimination Programme (NTEP), drug-susceptible TB is treated with daily fixed-dose combination tablets chosen by weight band. Ethambutol is one component of these combinations, at about 15 mg/kg per day. The number of tablets depends on body weight and treatment phase, and is decided by the treating team.

General reference range

Prescribing and reference sources describe ethambutol doses of about 15–25 mg/kg once daily, depending on the regimen.

Adult weight-band reference (daily therapy, adults and children 15 years and older)

One commonly cited reference table, from US TB guidelines, lists:

• 40–55 kg: 800 mg
• 56–75 kg: 1200 mg
• 76–90 kg: 1600 mg

In this specific table, 1.6 g is the highest dose listed. It is not a universal maximum dose for every patient or TB regimen.

Children

Dosing is weight-based. About 20 mg/kg once daily (range 15–25 mg/kg) is commonly cited in WHO and standard references, and India’s programme uses weight-band dosing for children. The doctor decides the exact dose.

Side Effects of Ethambutol

Eye and vision problems (most important)

• Blurred vision or reduced sharpness of vision
• Difficulty telling colours apart, especially red and green
• Blind spots in vision

Ethambutol can cause optic neuritis (optic nerve inflammation, also called optic neuropathy). Prescribing information notes that vision loss can sometimes be irreversible. Consult your doctor promptly if you notice any change in your vision. Do not wait for your next appointment, and do not stop TB treatment on your own.

Other side effects may include:

• Dizziness
• Nausea

Who Should Not Take Ethambutol

Ethambutol is contraindicated in people who:

• Are known to be hypersensitive to it
• Cannot notice or report changes in their vision (for example, very young children or unconscious patients)

Ethambutol is generally not used in people with known optic neuritis. Existing optic neuritis or significant visual problems need careful assessment by the treating doctor, and by an eye specialist where needed, before ethambutol is considered.

Ethambutol Precautions

• Eye checks: Vision is usually tested before starting ethambutol and periodically during treatment. Testing is done monthly when the dose is above 15 mg/kg per day. Existing eye conditions such as cataract, diabetic retinopathy, or optic neuritis make changes harder to judge, so tell your doctor about them.
• Kidney problems: Ethambutol is cleared mainly by the kidneys. The dose or dosing interval may need to be adjusted when kidney function is reduced. This must be decided by the doctor, and patients should not try to calculate or change their own dose.
• Liver: Liver problems with ethambutol are rare, and they are much less common than its eye effects. Hepatotoxicity has been reported, and other anti-TB drugs given with it can also affect the liver. Tell your doctor if you have liver disease. Also tell them promptly if you develop unusual fatigue, loss of appetite, dark urine, or yellowing of the skin or eyes.
• Pregnancy: Ethambutol may be used during pregnancy as part of an appropriate TB treatment regimen. Untreated TB can be dangerous in pregnancy, and the treating doctor weighs the benefits and potential risks. Tell your doctor if you are pregnant or planning pregnancy, and do not stop TB treatment on your own.

Ethambutol Brand Names in India

Brands of ethambutol 400 mg tablets available in India include Combutol, Myambutol, and Mycobutol. These are not the only ethambutol brands. Availability varies by location and may change over time.

Ethambutol Price in India

Approximate current listed prices for a strip of 10 tablets of 400 mg are ₹18–₹33.

Prices may vary by brand, strength, formulation, pack size, pharmacy, location, and available discounts. This is not a recommendation to buy or use the medicine without a prescription.

How HealthPil Can Help

Medicines should be started, adjusted, or stopped only under the guidance of a qualified healthcare professional. If you have questions about ethambutol, its side effects, or your TB treatment plan, you can consult a doctor through HealthPil.