Can cause dry mouth
drowsiness
dizziness
headache
constipation
impotence
vivid dreams
urinary retention
itching
burning sensation in the eye
fluid or electrolyte imbalance
gastrointestinal upset
paralytic ileus
orthostatic hypotension
weakness
sedation
pruritus
myalgia
urticaria
nausea
insomnia
arrhythmias
agitation
reduced gastrointestinal motility
respiratory depression
convulsion
bradycardia
coma and disturbances in conduction (in individuals with preexisting diseases of sinoatrial/ atrioventricular (SA/AV) nodes
overdose or on digitalis).