>10%:
Central nervous system: Headache
Dermatologic: Rash
Gastrointestinal: Anorexia, nausea, vomiting, diarrhea, oral candidiasis
Neuromuscular & skeletal: Gouty arthritis (acute)
1% to 10%:
Cardiovascular: Flushing of face
Central nervous system: Dizziness
Dermatologic: Skin rash, itching
Gastrointestinal: Sore gums, severe abdominal or stomach cramps and pain
Genitourinary: Dysuria
Renal: Renal calculi
<1%:
Central nervous system: Seizures
Hematologic: Leukopenia, hemolytic anemia, aplastic anemia
Hepatic: Hepatic necrosis
Renal: Urate nephropathy, nephrotic syndrome
Miscellaneous: Anaphylaxis, penicillin encephalopathy, lymphocytic leukemia