Monitor ECG & K levels in patients w/ risk factors for ventricular arrhythmias eg, cardiac disease, subarachnoid haemorrhage, metabolic abnormalities (hypokalaemia, hypocalcemia or hypomagnesemia), starvation, alcohol abuse & concomitant w/ drugs that prolong the QT interval. Epilepsy, history of convulsive disorders, Parkinson's disease; thyrotoxicosis, hypothyroidism, liver or severe resp disease; personal or family history of narrow-angle glaucoma, prostatic hypertrophy, myasthenia gravis or high ambient temp; surgery; phenothiazine hypersensitivity. May affect ability to drive or operate machinery. Pregnancy & lactation. Elderly especially frail or at risk of hypothermia.