There may be nausea, epigastric pain, allergic reactions (skin rash, itching, urticaria, and Quincke's edema).
Very rarely - anemia, thrombocytopenia, methemoglobinemia.
Rarely can occur rapid heartbeat, constipation, sleep disturbance, drowsiness, dizziness.
With prolonged use in doses much higher than recommended, the probability of impaired liver and kidney function is increased and a control of the blood picture is necessary.
All side effects of the drug should be reported to the doctor.