CEFAZOLIN is a cephalosprin antibiotic. It is used to treat or prevent certain kinds of bacterial infections. It will not work for colds, flu, or other viral infections. Compare cephalosporin antibiotics.

Ancef Side Effects

What should I watch for?

Tell your doctor or health care professional if your symptoms do not get better in a few days.

If you have diabetes you might get a false-positive result for sugar in your urine. Check with your doctor or health care professional before you change your diet or the dose of your diabetes medicine.


Interactions with Medications

Along with its needed effects, a medicine 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:


Bluish color

changes in skin color


swelling of the foot or leg


Incidence not known

Abdominal or stomach cramps or tenderness

back, leg, or stomach pains

black, tarry stools

bleeding gums

blistering, peeling, or loosening of the skin


blood in the urine or stools

bloody or cloudy urine

chest pain


clay-colored stools

cloudy urine


coughing up blood

dark urine

decrease in urine output or decrease in urine-concentrating ability

decreased frequency or amount of urine


diarrhea, watery and severe, which may also be bloody

difficult or painful urination

difficulty with breathing or swallowing


excessive muscle tone

fast heartbeat

feeling of discomfort


general body swelling

general tiredness and weakness



increased blood pressure

increased menstrual flow or vaginal bleeding

increased thirst

inflammation of the joints


itching of the vagina or genital area

joint or muscle pain

light-colored stools

loss of appetite

lower back or side pain

muscle aches or stiffness

muscle tension or tightness

nausea or vomiting


pain during sexual intercourse

pain, warmth, or burning in the fingers, toes, and legs

pale skin


pinpoint red spots on the skin

problems with vision or hearing

prolonged bleeding from cuts

puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue


red irritated eyes

red or black, tarry stools

red or dark brown urine

red skin lesions, often with a purple center

red, irritated eyes



skin rash

sore throat

sores, ulcers, or white spots on the lips or in the mouth

stomach cramps

sudden decrease in the amount of urine

swelling of the face, fingers, or lower legs

swollen lymph glands

swollen or painful glands

thick, white vaginal discharge with no odor or with a mild odor

tightness in the chest

trouble sitting still

troubled breathing

unpleasant breath odor

unusual bleeding or bruising

unusual tiredness or weakness

unusual weight loss

upper right abdominal pain


vomiting of blood

weight gain


yellowing of the eyes or skin

Some side effects 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:

Incidence not known

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

hives or welts

redness of the skin

sore mouth or tongue

weight loss

white patches in the mouth, tongue, or throat

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

GoodRx is not sponsored by or affiliated with any of the pharmacies identified in its price comparisons. All trademarks, brands, logos and copyright images are property of their respective owners and rights holders and are used solely to represent the products of these rights holders. This information is for informational purposes only and is not meant to be a substitute for professional medical advice, diagnosis or treatment. GoodRx is not offering advice, recommending or endorsing any specific prescription drug, pharmacy or other information on the site. GoodRx provides no warranty for any of the pricing data or other information. Please seek medical advice before starting, changing or terminating any medical treatment.
The information contained in the Truven Health Micromedex products as delivered by GoodRx is intended as an educational aid only. It is not intended as medical advice for individual conditions or treatment. It is not a substitute for a medical exam, nor does it replace the need for services provided by medical professionals. Talk to your doctor, nurse or pharmacist before taking any prescription or over the counter drugs (including any herbal medicines or supplements) or following any treatment or regimen. Only your doctor, nurse, or pharmacist can provide you with advice on what is safe and effective for you.
The use of the Truven Health products is at your sole risk. These products are provided "AS IS" and "as available" for use, without warranties of any kind, either express or implied. Truven Health and GoodRx make no representation or warranty as to the accuracy, reliability, timeliness, usefulness or completeness of any of the information contained in the products. Additionally, TRUVEN HEALTH MAKES NO REPRESENTATION OR WARRANTIES AS TO THE OPINIONS OR OTHER SERVICE OR DATA YOU MAY ACCESS, DOWNLOAD OR USE AS A RESULT OF USE OF THE THOMSON REUTERS HEALTHCARE PRODUCTS. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE OR USE ARE HEREBY EXCLUDED. Truven Health does not assume any responsibility or risk for your use of the Truven Health products.