Anaphylaxis (manifested by generalized pruritus, angioneurotic edema which may affect the larynx, tachycardia, severe dyspnea, cyanosis, diaphoresis, stridor, dizziness, rigors, loss of consciousness & peripheral circulatory failure), acute interstitial nephritis, agranulocytosis, allergic bronchial asthma, allergic vasculitis, angioedema, arthus phenomenon, chills, drug fever, eosinophilia, erythema multiforme, erythema nodosum, exfoliative dermatitis, fixed drug eruptions, hemolytic anemia, hypotension, laryngospasm, leukopenia, urticarial, erythematosus or morbiliform (maculopapular or exanthematic) rash & pruritus, serum sickness-like reactions (characterized by fever, malaise, urticaria, arthralgia, myalgia, lymphadenopathy, splenomegaly), SJS, vesiculobullous eruptions. Transient neutropenia, thrombocytopenia, thrombocytopenic purpura. Black hairy tongue,
C. difficile-associated diarrhea & colitis, increased capillary fragility characterized by spontaneous petechial hemorrhages w/ +ve result on the tourniquet test, diarrhea, epigastric distress, nausea, pruritus ani, sore mouth or tongue, vomiting. Hepatotoxicity, nephropathy, neuropathy.