Anaphylactic/anaphylactoid reactions (including shock & fatalities), skin rashes, urticaria, fever, pruritus, arthralgia, angioedema, facial edema; erythema multiforme, SJS, TEN, serum sickness-like reactions. Diarrhea, loose or frequent stools, abdominal pain, anorexia, flatulence, dry mouth, dyspepsia, nausea, & vomiting; pseudomembranous colitis. Transient elevation of ALT, AST, alkaline phosphatase, hepatitis, & jaundice. Transient elevations in BUN or creatinine levels, & rarely, acute renal failure. Headache, dizziness, nervousness, insomnia, somnolence, malaise, fatigue, seizures. Transient thrombocytopenia, leukopenia, neutropenia & eosinophilia; prolongation of prothrombin time (rarely). Hyperbilirubinemia. Rarely, genital pruritus, vaginitis, & candidiasis.