Last updated: June 2021

Prescription under medical supervision

Therapeutic action

– First line antituberculosis antibacterial (bacteriostatic activity)


– Tuberculosis, in combination with other antituberculosis antibacterials

Forms and strengths

– 100 mg and 400 mg tablets
– 100 mg dispersible tablet


– 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


– According to protocol

Contra-indications, adverse effects, precautions

– Do not administer to patients with severe renal impairment or pre-existing optic neuritis (e.g. diabetic retinopathy).
– May cause: dose-related retrobulbar optic neuritis, exacerbated in renal impairment. Patients should be warned that they must immediately stop treatment and seek medical attention in the event of visual disturbances such as blurred vision, reduced visual acuity, green-red colour blindness. Visual alterations are usually reversible a few weeks after stopping ethambutol.
– The dosage must be carefully adjusted to the body weight, especially for children under 5 years, as it is more difficult to detect visual alterations at this age.
Pregnancy: no contra-indication
Breast-feeding: no contra-indication


– For patients sensitive to first-line antituberculosis treatment, ethambutol is given as part of a fixed dose combination.
Storage: below 25 °C -