The following side effects are classified by organs and systems and by frequency. Side effects are classified by frequency as follows: very often (≥ 1/10), frequent (≥ 1/100 and <1/10), infrequently (≥ 1/1 000 and <1/100), rarely (≥ 1/10 000 and <1/1 000), very rarely (<1/10 000), with an unknown frequency (based on existing data, it is impossible to make an estimate).
Infections: infrequently - cystitis.
Immune system disorders: very rarely - severe skin reactions, erythema multiforme exudative, Stevens-Johnson syndrome.
Disorders from the metabolism and nutrition: rarely - weight gain.
Mental disorders: often - arousal, irritability, insomnia, anxiety.
Disturbances from the nervous system: infrequently - dizziness, headache; rarely - sedation (relaxation, slowing down the reaction); very rarely - cramps.
Disorders from the gastrointestinal tract: infrequent - dry mouth, nausea, vomiting, diarrhea.
Hepatobiliary disorders: very rarely - increased activity of hepatic enzymes, hepatitis.
At the beginning of the treatment, dry mouth and dizziness may appear, but they usually pass spontaneously during the treatment. In rare cases, there are symptoms of central nervous system stimulation, such as irritation, irritability, insomnia and anxiety, especially in children, nervousness, fatigue, drowsiness.