The dose of ethambutol depends on body weight and will be determined by your doctor.
For adults and children 13 years of age and over who have not used ethambutol before, the recommended dose is 15 mg per kilogram of body weight once daily (to a maximum of 2.5 g).
For adults and children aged 13 years and older who have used ethambutol before, the recommended dose is 25 mg per kilogram of body weight once daily. After 60 days of treatment, or when the infection clears up, the dose can be decreased to 15 mg per kilogram of body weight once daily.
When ethambutol is used in combination with other tuberculosis medications, a dose of 50 mg per kilogram of body weight (to a maximum of 2.5 g) can be taken twice a week. Alternatively, ethambutol can be used at a dose of 25 mg per kilogram of body weight to 30 mg per kilogram of body weight (to a maximum of 2.5 g) 3 times a week.
Children's dosage: Dosage has not been established for children less than 13 years of age but your doctor may consider ethambutol for children under 13 years, especially if other tuberculosis medications have not worked. It is not recommended for children whose visual changes cannot be monitored (e.g., children younger than 6 years of age).
Many things can affect the dose of a medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
Ethabutol must be taken for the recommended duration of treatment, even if you are feeling better. This will reduce the chances of having remaining bacteria grow back.
Ethambutol can be taken with or without food. It should be taken as a single daily dose, at the same time each day, and preferably in the morning.
Ethambutol should never be used on its own and should always be used in combination with other tuberculosis medications.
It is important to take this medication exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Store this medication at room temperature; protect it from light, moisture, and excessive heat; and keep it out of the reach of children.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.