From the digestive system: nausea, vomiting, diarrhea, decreased appetite, indigestion, abdominal pain, pseudomembranous colitis; increased activity of "hepatic" transaminases, hyperbilirubinemia, hepatitis, dysbacteriosis.
From the cardiovascular system: decrease in arterial pressure, vascular collapse, tachycardia, lengthening of the interval Q-T, extremely rare - atrial fibrillation.
From the side of metabolism: hypoglycemia (increased appetite, sweating, nervousness, trembling).
From the nervous system: headache, dizziness, weakness, drowsiness, insomnia, paresthesia, anxiety, fear, hallucinations, confusion, depression, movement disorders, convulsions.
From the sense organs: impaired vision, hearing, smell, taste and tactile sensitivity.
From the musculoskeletal system: arthralgia, muscle weakness, myalgia, tendon rupture, rhabdomyolysis, tendonitis.
From the urinary system: hypercreatininemia, interstitial nephritis, acute renal failure.
From the hematopoiesis: eosinophilia, hemolytic anemia, leukopenia, neutropenia, agranulocytosis, thrombocytopenia, pancytopenia, hemorrhages.
Allergic reactions: itching, redness of the skin, swelling of the skin and mucous membranes, urticaria, malignant exudative erythema (Stevens-Johnson syndrome), toxic epidermal necrolysis (Lyell's syndrome), bronchospasm, anaphylactic shock, severe choking, allergic pneumonitis, vasculitis.
Other: photosensitivity, asthenia (general weakness), exacerbation of porphyria, persistent fever, development of superinfection.