From the digestive system: increased activity of "liver" transaminases, pain in the epigastric region, ulceration of the mucous membrane of the gastrointestinal tract, diarrhea, heartburn, nausea, vomiting (rarely).
From the central nervous system: headache, dizziness, drowsiness.
From the urinary system (rarely): hematuria, oliguria, fluid retention, edema.
On the part of the blood system: thrombocytopenia, leukopenia, anemia, agranulocytosis, prolongation of bleeding time.
Allergic reactions: skin rash, hives, anaphylactic shock.