From the nervous system: at the beginning of treatment (especially in elderly patients) - drowsiness, fatigue, dizziness, impaired concentration, ataxia, disorientation, slowing of mental and motor reactions, confusion; headache, euphoria, depression, tremor, memory loss, movement coordination disorders (especially at high doses), mood reduction, dystonic extrapyramidal reactions (uncontrolled movements, including the eye), asthenia, myasthenia gravis, dysarthria, epileptic seizures (in patients with epilepsy); paradoxical reactions (outbreaks of aggression, psychomotor agitation, fear, suicidal tendencies, muscle spasm, hallucinations, anxiety, sleep disturbance).
On the part of the organs of hematopoiesis: leukopenia, neutropenia, agranulocytosis (chills, hyperthermia, sore throat, unusual fatigue or weakness), anemia, thrombocytopenia.
From the digestive system: dry mouth or drooling, heartburn, nausea, vomiting, decreased appetite,constipation or diarrhea; violations of liver function, increased activity of "liver" transaminases and alkaline phosphatase, jaundice.
From the genitourinary system: urinary incontinence, urinary retention, impaired renal function, decreased or increased libido, dysmenorrhea.
Allergic reactions: skin rash, itching.
Influence on the fetus: teratogenicity (especially I trimester), central nervous system depression, respiratory failure and suppression of sucking reflex in newborns whose mothers used the drug.
Other: addiction, drug dependence; lowering blood pressure; rarely - visual impairment (diplopia), weight loss, tachycardia. With a sharp decrease in dose or discontinuation of reception - the syndrome of "withdrawal" (sleep disturbance, dysphoric reactions, spasm of smooth muscles of internal organs and skeletal muscles, depersonalization, increased sweating, depression, nausea, vomiting, tremor, perception disorders, including hyperacuscus , paresthesia, photophobia, tachycardia, convulsions, rarely - psychotic reactions).
The frequency and nature of side effects depend on the individual sensitivity, dose and duration of treatment.With reduced doses or discontinuation of reception side effects disappear.