Gastralgia, nausea, vomiting, hepatotoxicity, nephrotoxicity, erosive-ulcerative lesions of the gastrointestinal tract, allergic reactions (including Stevens-Johnson syndrome, Lyell), tachycardia, increased blood pressure, bronchospasm. With prolonged use - dizziness, headache, visual impairment, tinnitus, decreased aggravationgation of platelets, hypocoagulation, haemorrhagic syndrome (epistaxis, bleeding gums, purpura, etc.), kidney damage with papillary necrosis; deafness; Reye's syndrome in children (hyperpyrexia, metabolic acidosis, disorders of the nervous system and psyche, vomiting, liver dysfunction).