Unasyn Side Effects

Generic Name: ampicillin / sulbactam

Note: This document contains side effect information about ampicillin / sulbactam. Some of the dosage forms listed on this page may not apply to the brand name Unasyn.

Some side effects of Unasyn may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

For the Consumer

Applies to ampicillin / sulbactam: injection powder for solution

Along with its needed effects, ampicillin / sulbactam may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking ampicillin / sulbactam:

Less common
  • Changes in skin color
  • diarrhea
  • pain, tenderness, or swelling of the foot or leg
Rare
  • Bloody nose
  • burning while urinating
  • chest pain, discomfort, or pressure
  • chills
  • decrease in frequency of urination
  • decrease in urine volume
  • difficulty in passing urine (dribbling)
  • flushing or redness of the skin
  • painful urination
  • swelling
  • swelling or puffiness of the face
  • tightness in the throat
  • unusually warm skin
Incidence not known
  • Abdominal or stomach cramps or tenderness
  • black, hairy tongue
  • blistering, peeling, or loosening of the skin
  • bloating
  • cough or hoarseness
  • cracks in the skin
  • diarrhea, watery and severe, which may also be bloody
  • fever
  • fever with or without chills
  • general feeling of tiredness or weakness
  • increased thirst
  • itching
  • joint or muscle pain
  • loss of heat from the body
  • lower back or side pain
  • nausea or vomiting
  • pain
  • red, irritated eyes
  • red, swollen skin
  • scaly skin
  • severe stomach pain
  • sore throat
  • sores, ulcers, or white spots on the lips or in the mouth
  • swelling or inflammation of the mouth
  • unusual bleeding or bruising
  • unusual tiredness or weakness
  • unusual weight loss
  • vomiting

Some side effects of ampicillin / sulbactam may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common
  • Bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site
Rare
  • Excess air or gas in the stomach or intestines
  • full or bloated feeling
  • general feeling of discomfort or illness
  • headache
  • passing gas
  • pressure in the stomach
  • redness, swelling, or soreness of the tongue
  • swelling of the abdominal or stomach area
  • white patches in the mouth or throat or on the tongue
  • white patches with diaper rash
Incidence not known
  • Burning feeling in the chest or stomach
  • indigestion
  • stomach upset

For Healthcare Professionals

Applies to ampicillin / sulbactam: injectable powder for injection

General

Ampicillin-sulbactam is generally well-tolerated.

Local

Local side effects have included pain at the intramuscular injection site (16%), pain at the intravenous injection site (3%), and thrombophlebitis (3%).

Gastrointestinal

Gastrointestinal side effects have included diarrhea (3%), nausea (<1%), vomiting (<1%), flatulence (<1%), abdominal distension (<1%), and glossitis (<1%). Rare cases of pancreatitis have been reported. Ampicillin-class antibiotics have been associated with gastritis, stomatitis, black hairy tongue, enterocolitis, and pseudomembranous colitis.

Hypersensitivity

Hypersensitivity reactions to ampicillin have included urticarial rash, edema, hypotension, fever, eosinophilia, dyspnea, a delayed hypersensitivity maculopapular rash, anaphylaxis, interstitial nephritis, Henoch-Schonlein purpura, focal glomerulonephritis, and Stevens-Johnson syndrome.

Dermatologic

Dermatologic side effects have included rash (<2%), itching (<1%), erythema multiforme, and exfoliative dermatitis. Rare cases of ampicillin-associated bullous pemphigoid, linear IgA dermatosis, and pseudoporphyria have been reported.

Hematologic

Hematologic side effects have included decreases in hemoglobin, hematocrit, red blood cells, neutrophils, lymphocytes, and platelets, and increases in lymphocytes, monocytes, basophils, eosinophils, and platelets. Thrombocytopenia, leukopenia, red cell aplasia, anemia, and positive direct Coombs test have rarely been reported. Atypical lymphocytosis has been reported in a pediatric patient. Penicillins have been associated with agranulocytosis.

Nervous system

Nervous system side effects have included seizures in very ill patients with high serum concentrations of ampicillin. 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. Ampicillin may worsen myasthenia gravis symptoms.

Hepatic

Hepatic side effects have included increases in AST (SGOT), ALT (SGPT), alkaline phosphatase, and LDH. Rare cases of hepatitis and prolonged cholestasis have been reported.

Metabolic

Metabolic side effects have included decreases in serum albumin and total protein.

Genitourinary

Genitourinary side effects have included urine retention, dysuria, urinary red blood cells, and urinary hyaline casts. Superinfections may occur (i.e., Candida, Pseudomonas).

Renal

Renal side effects have included increases in BUN and creatinine.

Other

Other side effects have included facial swelling, erythema, chills, throat tightness, substernal pain, epistaxis, and mucosal bleeding.

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.

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