CNS depression; paradoxical stimulation (high doses, children or elderly); headache, psychomotor impairment; dry mouth, thickened respiratory tract secretions, blurred vision; urinary difficulty or retention, constipation, increased gastric reflux; nausea, vomiting, diarrhoea, epigastric pain. Rarely, blood disorders. Convulsions, sweating, myalgia, paraesthesias, extrapyramidal effects, tremor, sleep disturbances, depression, confusion, tinnitus, hypotension, hair loss. Potentially Fatal: Anaphylaxis.