Gastro-intestinal effects: nausea, vomiting, diarrhea, abdominal pain, dyspepsia, rarely Pseudomembranous colitis.
CNS-related effects: headache, dizziness, restlessness, tremor, drowsiness, insomnia, nightmares, visual and other sensory disturbances and, more rarely, hallucinations, psychotic reactions, depression, convulsions, occasionally paraesthesia and peripheral neuropathy.
Dermatologic effects: rash, pruritus, rarely vasculitis, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, photosensitivity.
Hepatic effects: elevated liver enzyme values, jaundice, hepatitis.
Hematological effects: eosinophilia, leucopenia, thrombocytopenia, hemolytic anemia or agranulocytosis.
Others: transient increase in serum creatinine or blood urea nitrogen, occasionally acute renal failure, crystalluria, tachycardia.