Depending on the frequency of occurrence, the following groups of side
effects: very rare - less than 0.01%, rare - more than 0.01% and less than 0.1%, infrequent - more than 0.1% and less than 1%, frequent - more than 1% and less than 10%, very frequent - more than 10%.
From the nervous system: very frequent - drowsiness, sedation; frequent - dizziness, weakness, fatigue, confusion, gait disturbance, insomnia, euphoria, depression, asthenia, ataxia, tremor, hallucinations, nightmares, nystagmus, dry mouth; rare - paresthesia, dysarthria.
From the cardiovascular system: frequent - reduction of cardiac output, arterial hypotension.
From the gastrointestinal tract: very frequent - nausea; frequent - vomiting, constipation, diarrhea, dyspeptic phenomena; rare - abdominal pain, dysgeusia, impaired liver function.
From the respiratory system: frequent - respiratory depression.
From the musculoskeletal system: frequent - myalgia.
From the sense organs: frequent - paresis of accommodation, visual disturbances.
From the skin and subcutaneous tissue: frequent - a hyperhidrosis, an eruption.
From the side of the kidneys and the urinary system: frequent - polyuria, enuresis, dysuria; rare - urinary retention.
On the part of the reproductive system: rare - erectile dysfunction.
Common violations: very rare - hypothermia.
In isolated cases, there was an increase in spasticity, which was regarded as a paradoxical reaction to the drug.