.png | CAS_number = 536-33-4 | ATC_prefix = J04 | ATC_suffix = AD03 | ATC_supplemental = | PubChem = 2761171 | DrugBank = APRD00961 | chemical_formula = C₈H₁₀N₂S | molecular_weight = 166.244 g/mol | bioavailability = | protein_bound = Approximately 30% bound to proteins. | metabolism = | elimination_half-life = 2 to 3 hours | pregnancy_category = | legal_status = | routes_of_administration = }} Ethionamide (2-ethylthioisonicotinamide, Trecator SC®) is an antibiotic used in the treatment of tuberculosis.