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Cephalexin is a cephalosporin (SEF a low spor in) antibiotic. It works by fighting bacteria in your body.
Cephalexin is used to treat infections caused by bacteria, including upper respiratory infections, ear infections, skin infections, urinary tract infections and bone infections.
Cephalexin may also be used for purposes not listed in this medication guide.
You should not use this medicine if you are allergic to cephalexin or to similar antibiotics, such as Ceftin, Cefzil, Omnicef, and others. Tell your doctor if you are allergic to any drugs, especially penicillins or other antibiotics, or if you have kidney or liver disease, a stomach or intestinal disorder such as colitis, diabetes, or if you are malnourished.
Take cephalexin for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Cephalexin will not treat a viral infection such as the common cold or flu.
Do not use this medicine if you are allergic to cephalexin or to other cephalosporin antibiotics, such as:
cefaclor (Ceclor, Raniclor);
cefadroxil (Duricef);
cefazolin (Ancef, Kefzol);
cefdinir (Omnicef);
cefditoren (Spectracef);
cefpodoxime (Vantin);
cefprozil (Cefzil);
ceftibuten (Cedax);
cefuroxime (Ceftin); and others
To make sure cephalexin is safe for you, tell your doctor if you have:
an allergy to any drugs (especially penicillins);
kidney disease; or
a history of intestinal problems, such as colitis; or
a medical condition that requires blood-thinners
The liquid form of cephalexin may contain sugar. This may affect you if you have diabetes.
Cephalexin is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant.
Cephalexin can pass into breast milk. Tell your doctor if you are breast-feeding a baby.
Take cephalexin exactly as it was prescribed for you. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Do not use cephalexin to treat any condition that has not been checked by your doctor.
Shake the oral suspension (liquid) well just before you measure a dose. Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
Use this medicine for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Skipping doses may also increase your risk of further infection that is resistant to antibiotics. Cephalexin will not treat a viral infection such as the flu or a common cold.
Do not share cephalexin with another person, even if they have the same symptoms you have.
This medication can cause you to have unusual results with certain medical tests. Tell any doctor who treats you that you are using cephalexin.
Store the tablets and capsules at room temperature away from moisture, heat, and light.
Store the liquid medicine in the refrigerator. Throw away any unused liquid after 14 days.
Take cephalexin exactly as it was prescribed for you. Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include nausea, vomiting, stomach pain, diarrhea, and blood in your urine.
Antibiotic medicines can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or bloody, call your doctor. Do not use anti-diarrhea medicine unless your doctor tells you to.
Get emergency medical help if you have signs of an allergic reaction to cephalexin: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe stomach pain, diarrhea that is watery or bloody;
jaundice (yellowing of the skin or eyes);
easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin;
little or no urination;
agitation, confusion, hallucinations; or
severe skin reaction--fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Common cephalexin side effects may include:
diarrhea;
dizziness, feeling tired;
headache, joint pain; or
vaginal itching or discharge.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Metformin, probenecid, and blood-thinners may all interact with cephalexin. Other drugs may also interact with cephalexin, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use cephalexin only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Cephalexin (www.drugs.com/cephalexin.html).
Applies to cephalexin: oral capsule, oral powder for suspension, oral tablet
Along with its needed effects, cephalexin 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 immediately if any of the following side effects occur while taking cephalexin:
More common
Rare
Incidence not known
Some side effects of cephalexin 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
Applies to cephalexin: oral capsule, oral powder for reconstitution, oral tablet, oral tablet dispersible
The most commonly reported side effects included diarrhea, dyspepsia, gastritis, nausea, and vomiting.
Frequency not reported: Diarrhea, nausea, vomiting, dyspepsia, gastritis, abdominal pain, anal pruritus, Clostridium difficile-associated diarrhea/colitis/pseudomembranous colitis
Postmarketing reports: Colitis
Frequency not reported: Direct Coombs' test seroconversion, decreased prothrombin activity/prolonged prothrombin time, eosinophilia, neutropenia, thrombocytopenia, hemolytic anemia
Postmarketing reports: Aplastic anemia, pancytopenia, leukopenia, agranulocytosis
Frequency not reported: Urticaria, rash, erythema multiforme, Stevens Johnson syndrome, toxic epidermal necrolysis/exanthematic necrolysis
Frequency not reported: Transient hepatitis, cholestatic jaundice, AST and ALT elevations
Postmarketing reports: Increased bilirubin
Frequency not reported: Hypersensitivity/allergic reactions, angioedema, anaphylaxis
Allergic reactions (including urticaria and angioedema) usually subsided upon treatment discontinuation.
Frequency not reported: Genital pruritus, genital candidiasis, vulvovaginitis/vaginitis and vaginal discharge
Frequency not reported: Seizure, dizziness, headache
Frequency not reported: Agitation, confusion, hallucinations
Frequency not reported: Arthralgia, arthritis, joint disorder
Frequency not reported: Reversible interstitial nephritis
Postmarketing reports: Renal dysfunction, toxic nephropathy, increased blood urea nitrogen, increased creatinine
Frequency not reported: Fatigue
Postmarketing reports: Fever
Frequency not reported: Development of drug-resistant bacteria development
Postmarketing reports: Increased alkaline phosphatase, increased lactate dehydrogenase (LDH)
Postmarketing reports: Hemorrhage
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Cephalexin (www.drugs.com/cephalexin.html).
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