|The most common side effects at usual doses are nausea, constipation, confusion and occasionally vomiting. Other possible effects include: urticaria, pruritus, rashes, decreased libido or potency, mood changes, drowsiness, dry mouth, sweating, headache, facial flushing, vertigo, bradycardia, tachycardia, palpitations, postural hypotension, dysphoria, hypotension, hypothermia, miosis, dysuria, sedation or excitation (particularly in elderly subjects in whom delirium and hallucinations may occur), increased intracranial pressure which may aggravate existing cerebral disorders, increased pressure in the main bile duct and urinary retention in cases of prostatic adenoma or urethral stenosis. Mild respiratory depression occurs even at therapeutic doses. In the event of overdosage it may be severe, serious or even fatal. Physical and psychic dependence may appear after administration of therapeutic doses for periods of 1 to 2 weeks. Some cases of dependence have been observed after only 2 to 3 days.Withdrawal syndrome: this may occur a few hours after withdrawal of a prolonged treatment, and is maximal between the 36th and 72nd hours.|
Reporting of suspected adverse reactions Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard.