Side effects usually occur at the beginning of the treatment and gradually disappear as the drug is used or the dose is lowered.
From the central nervous system: at the beginning of treatment (especially in elderly patients) - drowsiness, fatigue, dizziness, impaired concentration, disorientation, slowing of mental and motor reactions; rarely - headache, euphoria, decreased mood, tremor, memory loss, confusion, impaired coordination of movements, dystonic extrapyramidal reactions (uncontrolled movements, including the eye), myasthenia gravis, dysarthria; extremely rarely - paradoxical reactions (aggressive outbursts, confusion, psychomotor agitation, fear, suicidal tendencies, muscle spasm, hallucinations, irritability, anxiety, insomnia).
From the hematopoiesis: leukopenia, neutropenia, agranulocytosis (chills, hyperthermia, sore throat, unusual fatigue or weakness), anemia, thrombocytopenia.
From the digestive system: dry mouth or salivation, heartburn, nausea, vomiting, anorexia, constipation, diarrhea; violations of liver function, increased activity of "liver" transaminases and alkaline phosphatase (APF), 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 of blood pressure (BP); rarely - visual impairment (diplopia), weight loss, tachycardia. With a sharp decrease in dose or withdrawal of the syndrome, "withdrawal" syndrome (increased irritability, sleep disturbance, dysphoria, spasm of the smooth muscles of the internal organs and skeletal muscles, depersonalization, increased sweating, depression, nausea, vomiting, tremor, perception disorders, incl.hyperaemia, paresthesia, photophobia; tachycardia, convulsions, rarely - acute psychosis).