Sweating, dizziness, nausea, vomiting, dry mouth & fatigue. Very rarely, hypoglycaemia (patients w/ diabetes or renal insufficiency, elderly).
Inj Constipation, drowsiness, confusion, facial flushing, bradycardia, palpitations, orthostatic hypotension, hypothermia, restlessness, mood changes, miosis, raised intracranial pressure.