Ampicillin Side Effects
Not all side effects for ampicillin may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
For the Consumer
Applies to ampicillin: oral capsules, oral for suspension, parenteral powder for injection or infusion
Side effects include:
GI effects (diarrhea, nausea), rash.
For Healthcare Professionals
Applies to ampicillin: compounding powder, injectable powder for injection, oral capsule, oral powder for reconstitution
The eruption that is sometimes observed in ampicillin-treated patients with undiagnosed infectious mononucleosis is characterized by a delayed pruritic maculopapular erythematous rash that generally occurs 5 to 10 days after ampicillin therapy is initiated. It is often more severe and extensive and longer in duration than the typical spontaneous eruption of infectious mononucleosis, but does not necessarily indicate a lifelong allergy to ampicillin or other penicillin derivatives. Although this type of reaction has been described with penicillin and also tetracycline, ampicillin has been implicated most frequently. Therefore, ampicillin may not be suitable in patients suspected of having infectious mononucleosis.
Hypersensitivity reactions have included urticarial rash, erythema multiforme, exfoliative dermatitis, serum sickness-like reactions, edema, hypotension, fever, eosinophilia, dyspnea, interstitial nephritis, Henoch-Schonlein purpura, focal glomerulonephritis, Stevens-Johnson syndrome, bullous pemphigoid, hypersensitivity myocarditis, toxic epidermal necrolysis, and fixed drug eruptions. Anaphylaxis is rare (up to 0.2%), but is more common in patients receiving parenteral ampicillin therapy. Erythematous eruptions have been reported in patients with infectious mononucleosis who were given ampicillin.
Gastrointestinal side effects have included diarrhea (5% to 20%), nausea, vomiting, anorexia, gastritis, generalized abdominal cramps, oral candidiasis, black hairy tongue, mouth or tongue soreness, glossitis, stomatitis, enterocolitis, and pseudomembranous colitis. Rare cases of pancreatitis have occurred.
Ampicillin-associated diarrhea is usually self-limiting and thought to be related to alterations of intestinal microflora. However, Clostridium difficile toxin diarrhea may occasionally occur and may be indicative of pseudomembranous colitis. If diarrhea is severe, or if the patient has more than 10 loose stools per day, the stools should be tested for Clostridium difficile toxin. Clostridium perfringens type C has also been implicated in an isolated case of ampicillin-related pseudomembranous colitis in an 11-year-old boy.
Transient increases in liver function tests and chronic cholestasis have rarely been associated with ampicillin. Acute pancreatitis has been reported and confirmed by rechallenge with ampicillin in a patient in whom there was no other obvious cause of pancreatitis.
Neutropenia was described in one case report of 3 pediatric patients who received high dosages (150 to 400 mg/kg) of intravenous ampicillin. In all 3 cases, white blood cell and neutrophil counts returned to normal after discontinuation of therapy.
Hematologic side effects have rarely included thrombocytopenia, thrombocytopenic purpura, Henoch Schönlein purpura, red cell aplasia, leukopenia, neutropenia, anemia, eosinophilia and agranulocytosis. These reactions are generally reversible and some may be allergic in nature. Prolongations in activated partial thromboplastin time and bleeding time, and platelet aggregation abnormalities have also been reported. Leukopenia has been reported in 23% of patients with liver disease receiving beta-lactam antibiotics.
Nervous system side effects have rarely included seizures in patients treated with large intravenous doses of ampicillin, headache, and dizziness.
Seizures have been reported in patients with high serum concentrations of ampicillin, although these patients were otherwise very ill. High cerebral spinal fluid (CSF) levels of some penicillins are known to be potentially neurotoxic, and the CSF concentrations of ampicillin rise significantly in meningitis.
Generalized seizures have been described in 2 patients during treatment with ampicillin, although in both cases, there were underlying disease factors that may have predisposed the patients to seizure activity.
Renal side effects have rarely included crystalluria in patients receiving high dosages of intravenous ampicillin, interstitial nephritis, and glomerulonephritis. The latter two may be associated with hypersensitivity.
Hepatic side effects have included rare cases of hepatitis, cholestasis, and elevated AST (SGOT) and ALT (SGPT). Glutamic oxalacetic transaminase is released at intramuscular injection sites; therefore increased SGOT is not necessarily a hepatic side effect.
Local side effects have rarely included phlebitis after IV administration and pain with IM administration of ampicillin.
Dermatologic side effects have included rash, maculopapular rash, morbilliform rash, exfoliative dermatitis, erythema multiforme, purpura, urticaria, pruritus, and acute generalized exanthematous pustulosis. Rashes have been reported in patients with infectious mononucleosis and Epstein-Barr virus. Ampicillin has also been associated with a case of reactivation of latent Epstein-Barr virus infection and rash.
HIV/AIDS patients have a significantly higher incidence of rash than other patients.
Genitourinary side effects have included vaginal candidiasis.
Respiratory side effects have included laryngeal stridor.
Other side effects have included fever.
More about ampicillin
- Other brands: Principen
Related treatment guides
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