Allergic reactions: skin rash, bronchospasm, angioedema.
Formation on the basis of the hapten mechanism of the "aspirin triad" (combination of bronchial asthma, recurrent polyposis of the nose and paranasal sinuses, and intolerance of acetylsalicylic acid and preparations of pyrazolone series).
From the gastrointestinal tract: nausea, vomiting, pain in the epigastric region, diarrhea;
On the part of the hematopoiesis system: Thrombocytopenia, anemia, leukopenia, hemorrhagic syndrome (nasal bleeding, bleeding gums), lengthening of clotting time.
With prolonged use in large doses, there may be erosive and ulcerative lesions of the gastrointestinal tract, bleeding, black "tarry" stool, general weakness, interstitial nephritis, prerenal azotemia with increasing levels creatinine and hyperkalemia, bronchospasm, papillary necrosis, acute renal failure, nephrotic syndrome, increased activity of "liver" transaminases, aseptic meningitis, increased symptoms of chronic heart failure, edema.
When such symptoms appear, it is recommended to stop taking the drug and immediately consult a doctor.