Cefadyl Side Effects

Generic Name: cephapirin

Note: This page contains information about the side effects of cephapirin. Some of the dosage forms included on this document may not apply to the brand name Cefadyl.

Not all side effects for Cefadyl may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

Applies to cephapirin: injectable powder for injection


A case of occupational contact dermatitis due to cephalosporin allergy has been reported in a nurse who prepared cephalosporin solutions for administration to patients. The dermatitis resolved after the nurse stopped preparing the solutions.

Hypersensitivity reactions, including anaphylaxis, are unusual. There is approximately a 10% to 15% chance of allergic cross reactivity in patients who are allergic to penicillin.


Because neutropenia is often accompanied by rash and fever, it is believed to be a result of a hypersensitivity reaction.

Hematologic abnormalities have included neutropenia, thrombocytopenia, and eosinophilia. Drug discontinuation may be necessary depending on these changes and the condition of the patient.


Renal adverse effects include at least one case of acute interstitial nephritis that was attributed to cephapirin (the active ingredient contained in Cefadyl)

One patient developed a rash after 15 days on cephapirin. On day 56 of therapy, the patient had an increase in serum creatinine to 9.3 mg/dL, an increase in blood urea nitrogen to 109 mg/dL, 2+ protein in the urine, and eosinophilia. Laboratory and physical findings suggested acute interstitial nephritis. After stopping cephapirin, the serum creatinine decreased to a pretreatment value of 1.4 mg/dL within nine months.


Phlebitis is more common when the drug is administered for longer than two days. Careful monitoring of the infusion site and regular rotation of infusion sites should significantly decrease the risk of phlebitis.

Local reactions include phlebitis in up to 50% of patients who receive the drug by intravenous administration. Intramuscular administration may result in pain and induration at the injection site, but does not usually require drug discontinuation.


Women may experience an increased incidence of vaginal yeast infections while receiving cephapirin (the active ingredient contained in Cefadyl)

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.