From the digestive system: gastralgia, decreased appetite, nausea, vomiting, diarrhea, flatulence, abdominal pain, increased activity of "hepatic" transaminases, hyperbilirubinemia, cholestatic jaundice, pseudomembranous enterocolitis. From the nervous system: headaches, dizziness, motion uncertainty, tremors, convulsions, numbness and paresthesia of the limbs, intense dreams, nightmarish dreams, psychotic reactions, anxiety, arousal, phobias, depression, confusion, hallucinations, increased intracranial pressure. From the musculoskeletal system: tendonitis, myalgia, arthralgia, tendosynovitis, tendon rupture.
From the sense organs: violation of color perception, diplopia, violation of taste, smell, hearing and balance.
From the side of the cardiovascular system: tachycardia, lowering of blood pressure Allergic reactions: skin rash, itching, hives, allergic pneumonitis, allergic nephritis, eosinophilia, fever, angioedema, bronchospasm; multiforme exudative erythema (including Stevens-Johnson syndrome) and toxic epidermal necrolysis (Lyell's syndrome), photosensitivity, vasculitis, anaphylactic shock.
From the skin: point hemorrhages (petechiae), bullous hemorrhagic dermatitis, papular rash with a cortex, indicative of vascular lesions (vasculitis).
From the hematopoiesis: leukopenia, agranulocytosis, anemia, thrombocytopenia, pancytopenia, hemolytic and aplastic anemia.
From the urinary system: acute interstitial nephritis, impaired renal function, hypercreatininaemia, increased urea concentration.
Other: dysbacteriosis of the intestine, superinfection, hypoglycemia (in patients with diabetes mellitus), vaginitis.