Can cause dependence
withdrawal symptoms
nausea
vomiting
constipation
drowsiness
confusion
difficulty in micturition
ureteric or biliary spasms
urinary retention
dry mouth
dizziness
sweating
facial flushing
headache
vertigo
bradycardia
tachycardia
palpitations
oedema
postural hypotension
hypothermia
vertigo
restlessness
mood changes
decreased libido or potency
hallucination
miosis
raised intracranial pressure
muscle rigidity
visual disturbances.
Potentially Fatal: Respiratory depression and hypotension
with circulatory failure and deepening coma (larger doses). Convulsions (especially in childn and infants)
rhabdomyolysis.