From the gastrointestinal tract: nausea, diarrhea, vomiting, abdominal pain, flatulence, anorexia, cholestatic jaundice (especially in patients with liver disease), hepatitis, hepatonecrosis.
From the nervous system: dizziness, headache, fatigue, anxiety, tremor, insomnia, nightmarish dreams, peripheral paralysis (anomaly of perception of pain), sweating, increased intracranial pressure, confusion, depression, hallucinations, and other manifestations of psychotic reactions (occasionally progressing to conditions in which the patient can do harm to himself), migraine, fainting, thrombosis of the cerebral arteries.
From the sense organs: violation of taste and smell, visual impairment (diplopia, change in color perception), tinnitus, hearing loss.
From the cardiovascular system: tachycardia, heart rhythm disturbances, lowering blood pressure, flushing of blood to the skin of the face.
From the hematopoietic system: leukopenia, granulocytopenia, anemia, thrombocytopenia, leukocytosis, thrombocytosis, hemolytic anemia.
From the laboratory indicators: hypoprothrombinemia, increased activity of "liver" transaminases and alkaline phosphatase, hypercreatininemia, hyperbilirubinemia, hyperglycemia.
From the urinary system: hematuria, crystalluria (especially in alkaline urine and low diuresis), glomerulonephritis, dysuria, polyuria, urinary retention, albuminuria, urethral bleeding, decreased renal nitrogen function, interstitial nephritis.
From the musculoskeletal system: arthralgia, arthritis, tendovaginitis, tendon ruptures, myalgia.
Allergic reactions: itching, urticaria, the formation of blisters accompanied by bleeding and small nodules that form scabs, drug fever, pinpoint hemorrhages (petechiae), face and laryngeal edema, shortness of breath, eosinophilia, vasculitis, nodal erythema, exudative erythema multiforme, Stevens-Johnson syndrome (malignant exudative erythema), toxic epidermal necrolysis (Lyell's syndrome).
Other: increased photosensitivity, general weakness, superinfection (candidiasis, pseudomembranous colitis).