

Myambutol is a prescription medicine containing ethambutol, an antibiotic primarily used to treat tuberculosis (TB). Tuberculosis is a serious infection caused by the bacterium Mycobacterium tuberculosis, mainly affecting the lungs but sometimes involving other organs, such as the spine, kidneys, or brain. Myambutol is not used by itself. It is combined with other TB medicines to prevent resistance and fully treat the infection. It is available as an oral tablet and is usually taken once daily.
| Product Name | Myambutol |
|---|---|
| Active Ingredient | Ethambutol Hydrochloride |
| Drug Class | Antitubercular agents |
| Available Forms | Oral tablets |
| Strengths Available | 100 mg and 400 mg |
| Routes of Administration | Taken by mouth |
| Myambutol Uses | Treats: Active pulmonary tuberculosis Extrapulmonary tuberculosis |
| Myambutol Storage | Store at room temperature between 20°C and 25°C (68°F and 77°F) |
| Pregnancy and Breastfeeding | Consult a doctor |
| Legal Status | Rx only |
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Myambutol is FDA-approved to treat:
Myambutol is not a standalone medication but is used along with other medicines to treat tuberculosis.
Myambutol (ethambutol) works by interfering with bacterial cell wall synthesis. It mainly works by:
By weakening the bacterial cell wall, the drug helps other tuberculosis medicines work more effectively.
If you are diagnosed with tuberculosis (TB) and starting the treatment, you should carefully check the following Myambutol precautions. It is crucial to inform your healthcare professional if you have:
Important Information: Eye monitoring is essential before starting the tuberculosis treatment. Myambutol can affect your vision, so your doctor may examine you before and during treatment.
Your doctor may stop or change your medication if you experience the following symptoms:
The table below summarizes possible side effects of Myambutol. If you experience any usual Myambutol side effects, consult your doctor immediately.
| Common Side Effects of Myambutol | Sudden vision loss | Rare Side Effects of Myambutol |
|---|---|---|
| Loss of appetite | Eye pain | Liver injury |
| Nausea | Skin rash | Severe allergic reaction |
| Vomiting | Visual disturbances | Difficulty breathing |
| Headache | Numbness or tingling | Blood disorders (thrombocytopenia, leukopenia) |
| Mild stomach upset | Joint pain | Sudden vision loss |
| Dizziness | Increased uric acid levels | Severe rash |
| Diarrhea | Fever | Swelling of the throat or face |
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Myambutol is contraindicated in patients who have:
Follow the directions as prescribed by your healthcare provider.
In case of a Myambutol overdose, contact your healthcare provider or seek immediate medical attention. Even if there are no symptoms, call the Poison Control Center immediately.
If you forget to take a Myambutol tablet at the regular time, take it as soon as possible. If you are unable to take the tablet on the same day, take it the next day as usual. Do not double the dose, as this can cause severe adverse effects.
Several medicines are known to interact with Myambutol. Some of them are listed below:
Note: Avoid taking aluminum-containing antacids within several hours of Myambutol tablets, as they can reduce their effectiveness.
If Myambutol tablets are unavailable, consider the following Myambutol alternatives for treating tuberculosis.
Do not switch to these alternatives without consulting your healthcare professional.
Myambutol may be expensive at some U.S. pharmacies. At Polar Bear Meds, we help you access your prescribed medications at more affordable prices by sourcing them through fully licensed Canadian and international pharmacy partners.
You can buy Myambutol online in Canada from Polar Bear Meds and receive several benefits:
At Polar Bear Meds, your prescription is filled through licensed pharmacy partners to ensure authenticity and safety. If you are seeking a trusted, affordable way to buy Myambutol online from Canada, Polar Bear Meds offers a convenient way to access your prescribed medication.
The medical content provided about Myambutol is for informational and educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Myambutol is a prescription-based medicine for tuberculosis and should be used only under the supervision of a healthcare professional. Always consult your doctor before changing or stopping your Myambutol dosage.

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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