From the digestive system: nausea, vomiting, stomach pain, ulceration of the gastric mucosa, bleeding in the gastrointestinal tract, burning in the epigastric region, dry mouth, cholestasis, jaundice, increased activity of "liver" transaminases, hyperbilirubinemia.
From the nervous system: rarely - headache, dizziness; in isolated cases - hallucinations.
From the side of the cardiovascular system: decrease or increase in blood pressure, tachycardia, cyanosis.
On the part of the system of hematopoiesis: agranulocytosis, leukopenia, thrombocytopenia, hemolytic anemia, thrombocytopenic purpura.
From the respiratory system: shortness of breath, asthma attack, bronchospasm - in predisposed patients.
From the urinary system: renal dysfunction (when taking high doses) - oliguria, anuria, proteinuria, interstitial nephritis; staining the urine in red.
Allergic reactions: urticaria (incl.on the conjunctiva and mucous membranes of the nasopharynx), skin rash, itching, angioedema, in rare cases - multiforme exudative erythema (including Stevens-Johnson syndrome), toxic epidermal necrolysis (Lyell's syndrome), bronchospasm, anaphylactic shock.
From the skin: epidermolysis, necrotic processes in the oral cavity, nose, ears and genitals.