Ethambutol Oral: Dosing, Duration, and Precautions
Ethambutol guidance for tuberculosis combination therapy, with optic neuritis monitoring precautions.
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Source reviewed
August 2022
Guide category
Oral drugs
Safety boundary
Prescription medicine information for clinician-guided use.
Kenza Health Hub presents this medicine page as structured health education. Check dose, route, interactions, pregnancy or breast-feeding considerations, and local protocol with a qualified clinician or pharmacist. Read our medical editorial policy.
Therapeutic action
First-line antituberculosis antibacterial (bacteriostatic activity).
Indications
Tuberculosis, in combination with other antituberculosis antibacterials.
Forms and strengths
- 100 mg and 400 mg tablets.
- 50 mg and 100 mg dispersible tablets.
Dose
- Child and adult: 15 to 25 mg/kg once daily.
- Do not exceed 1200 mg daily.
- Patient with renal impairment: 15 to 25 mg/kg 3 times weekly.
Duration
According to protocol.
Contra-indications, adverse effects, precautions
- Do not administer to patients with severe renal impairment or pre-existing optic neuritis such as diabetic retinopathy.
- May cause dose-related retrobulbar optic neuritis, worsened by renal impairment.
- Patients should immediately stop treatment and seek medical attention in the event of visual disturbances such as blurred vision, reduced visual acuity, or green-red colour blindness.
- Visual alterations are usually reversible a few weeks after stopping ethambutol.
- Dosage must be carefully adjusted to body weight, especially for children under 5 years because visual alterations are harder to detect.
- Pregnancy: no contra-indication.
- Breast-feeding: no contra-indication.
Source
MSF Essential drugs practical guidelines (January 2026)
This page combines source-derived medicine reference sections with Kenza editorial context, while leaving out the Storage and Remarks sections from the source batch.
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