halothane /hal″əthān/ , an inhalation anesthetic. ▪ INDICATIONS: It is prescribed for induction and maintenance of general anesthesia. ▪ CONTRAINDICATIONS: It is not recommended for obstetric anesthesia unless uterine relaxation is required. ▪ ADVERSE EFFECTS: Among the more serious but rare adverse reactions are hepatic necrosis, cardiac arrest or arrhythmia, hypotension, malignant hyperthermia, nausea, and emesis.