From the nervous system: depression, headache, dizziness, fatigue, insomnia, increased convulsive alertness, anxiety, agitation, tremor, rarely - convulsions.
From the side of the digestive system, nausea, vomiting, diarrhea, abdominal pain, decreased appetite, flatulence, pseudomembranous colitis, transient increase in "hepatic" transaminases, cholestatic jaundice, hepatitis, and necrosis of the liver.
From the urinary system. crystalluria, rarely glomerulonephritis, dysuria.
Allergic reactions: skin rash, skin itch, hives, skin hyperemia, rarely - angioedema, bronchospasm, arthralgia.
From the hematopoietic system: leukopenia, neutropenia, thrombocytopenia (at doses of 1600 mg / day), agranulocytosis, eosinophilia.
Local reactions: phlebitis.
Other: tachycardia, myalgia, tendonitis, candidiasis, photosensitivity.