Front Desk: 469-391-0070
Cephalexin Antibiotic: Uses, Dosage, Side Effects & Warnings
Summary of Key Points
Cephalexin is an antibiotic commonly used to treat a variety of bacterial infections, including those affecting the respiratory tract, skin, and urinary system (UTIs). It belongs to the cephalosporin class of antibiotics, which work by preventing bacteria from growing. Cephalexin is available in different forms and strengths, and it’s important to take it exactly as prescribed by your healthcare provider. For personalized advice on Cephalexin usage and dosage, you can consult our telemedicine providers.
Names of Medication
Keflex (Cephalexin)
Daxbia (Cephalexin)
The generic name refers to the active ingredient, while the brand name is assigned by the manufacturer. In this case, the generic name for the medication is listed in parentheses.
Pharmacologic Category
Cephalosporin Antibiotics (First Generation)
Cephalexin Dosage
Cephalexin is prescribed for a range of bacterial infections. The dosage, frequency, and duration of treatment depend on the specific type of infection being treated. Always follow your healthcare provider’s instructions carefully, and consult them before making any changes to your dose. Our telemedicine providers are also available to offer guidance on Cephalexin dosage and administration.
Cephalexin for Pneumonia
500 mg every 6 hours for 7-14 days
Cephalexin for Bronchitis
500 mg every 6-12 hours for 7-10 days
Cephalexin for Skin Infections (e.g., cellulitis, impetigo)
500 mg every 6-12 hours for 7-14 days
Cephalexin for Ear Infections (Otitis Media)
500 mg every 6 hours for 10-14 days
Cephalexin for Urinary Tract Infections (UTIs)
500 mg every 12 hours for 7-14 days
Cephalexin for Bone Infections
500 mg every 6 hours for at least 4-6 weeks
Cephalexin for Dental Infections
500 mg every 6 hours for 7-10 days
Cephalexin for Strep Throat
500 mg every 12 hours for 10 days
Dosage Forms and Strengths
Cephalexin is available in the following forms and strengths:
- Capsules: 250 mg, 500 mg, 750 mg
- Tablets: 250 mg, 500 mg
- Oral Suspension: 125 mg/5 mL, 250 mg/5 mL
Administration Instructions for Cephalexin
Cephalexin can be taken with or without food. If it causes stomach discomfort, taking it with food may help alleviate this. It’s essential to complete the full course of treatment, even if you start feeling better, to ensure the infection is fully eradicated. If you miss a dose, take it as soon as you remember, but avoid doubling up on doses. If you have any questions about how to take your Cephalexin prescription, consult your healthcare provider.
Adverse Reactions and Cephalexin Side Effects
Like all medications, Cephalexin may cause side effects. While most are mild, some may require medical attention. If you experience severe or concerning symptoms, contact your healthcare provider immediately. Our telemedicine providers are available to help address any concerns about Cephalexin side effects in adults.
Common Side Effects: Diarrhea, nausea, vomiting, upset stomach
Less Common Side Effects: Dizziness, fatigue, headache
Serious Side Effects (Rare): Severe allergic reactions (rash, itching, swelling, difficulty breathing), severe diarrhea (Clostridium difficile infection), liver problems (yellowing of the skin or eyes)
Contraindications for Cephalexin
A contraindication is a specific condition where a medication should not be used because it may be harmful. Several contraindications should be considered before taking Cephalexin:
Allergy to Cephalexin or other cephalosporins: If you have had an allergic reaction to Cephalexin or other cephalosporins, you should not take this medication. Allergic reactions can range from mild rashes to severe, life-threatening conditions like anaphylaxis.
Severe allergy to penicillin: Some individuals with a penicillin allergy may also be allergic to cephalosporins like Cephalexin. This cross-reactivity may lead your healthcare provider to recommend an alternative antibiotic.
Kidney disease: Cephalexin is processed by the kidneys. If you have severe kidney disease or impaired kidney function, your body may not clear the drug efficiently, increasing the risk of side effects. In such cases, your healthcare provider may adjust the dose or suggest a different medication.
Drug to Drug Interactions with Cephalexin
Cephalexin can interact with other medications, potentially affecting its effectiveness or increasing the risk of side effects. Some medications that may interact with Cephalexin include:
Metformin (Glucophage): Cephalexin may increase metformin levels in your blood, raising the risk of side effects such as low blood sugar (hypoglycemia).
Probenecid (Benemid): Probenecid can slow down how quickly your body eliminates Cephalexin, potentially increasing the risk of side effects.
Warfarin (Coumadin): Cephalexin can enhance the effects of warfarin, a blood thinner, which may increase the risk of bleeding. Your healthcare provider may need to monitor your blood clotting levels more closely if you take these medications together.
Cephalexin in Pregnancy
Is it safe to take Cephalexin when pregnant?
Cephalexin is generally considered safe during pregnancy. It is classified as a Category B medication by the FDA, meaning animal studies have not shown harm to the fetus, although well-controlled studies in pregnant women are limited. If you are pregnant or planning to become pregnant, it’s important to discuss the potential risks and benefits of Cephalexin with your healthcare provider. You can also consult one of our telemedicine providers for personalized advice on using Cephalexin during pregnancy.
Cephalexin while Breastfeeding
Is it safe to take Cephalexin while breastfeeding?
Cephalexin is considered safe for use while breastfeeding. Only small amounts of the medication pass into breast milk, making it unlikely to cause harm to a nursing infant. However, some babies may experience mild side effects, such as diarrhea or yeast infections. If you are breastfeeding and have concerns about potential side effects for you or your baby, consult your healthcare provider or schedule a telemedicine consultation to discuss your options.
Estimated Cost of Cephalexin Medication
The cost of a 30-day supply of Cephalexin without insurance can vary depending on the pharmacy and location. With a GoodRx coupon, the estimated price for a 30-day supply of Cephalexin 500 mg typically ranges from $10 to $15. Prices may fluctuate, so it’s a good idea to check with your local pharmacy or use a coupon service like GoodRx for the most up-to-date pricing information.
Possible Alternatives to Cephalexin
If Cephalexin isn’t the right option for you, there are alternative treatments available for the conditions it commonly treats. Always consult your healthcare provider or one of our telemedicine providers before making any changes to your treatment plan.
- Pneumonia: Alternatives may include antibiotics such as azithromycin (Zithromax) or doxycycline, depending on the type of pneumonia. Lifestyle changes, like quitting smoking and staying up to date on vaccinations, can also help prevent future infections.
- Bronchitis: For bacterial bronchitis, alternatives include amoxicillin or azithromycin. For viral bronchitis, rest, fluids, and over-the-counter medications may be recommended to alleviate symptoms.
- Skin infections: Alternatives include clindamycin or doxycycline. Keeping the affected area clean and dry can also support recovery. While Cephalexin is commonly prescribed for skin infections, alternatives may be necessary in certain cases.
- Ear infections: Alternatives include amoxicillin or azithromycin. In some instances, ear infections may resolve without the need for antibiotics.
- Urinary tract infections (UTIs): Alternatives include nitrofurantoin (Macrobid) or trimethoprim-sulfamethoxazole (Bactrim). Drinking plenty of water and urinating frequently can help flush out bacteria. Cephalexin is a common treatment for UTIs, but other options may be considered based on individual needs.
- Bone infections: Alternatives include clindamycin or vancomycin, depending on the severity of the infection. In some cases, surgery may also be required.
- Dental infections: Alternatives include amoxicillin or clindamycin. Maintaining good oral hygiene and scheduling regular dental check-ups can help prevent future infections.
- Strep throat: Alternatives include amoxicillin or azithromycin. Drinking warm liquids and using throat lozenges can help soothe symptoms.
- Impetigo: Alternatives include topical antibiotics like mupirocin (Bactroban) or oral antibiotics such as clindamycin. Keeping the affected area clean and covered can help prevent the spread of infection.
- Cellulitis: Alternatives include clindamycin or doxycycline. Elevating the affected limb and applying warm compresses can help reduce swelling and discomfort.
Recent Updates on Cephalexin Research
Recent research on Cephalexin has focused on its effectiveness in treating resistant bacterial infections and its role in outpatient care. Studies indicate that Cephalexin remains effective against many common bacterial infections, although some bacteria are developing resistance. Researchers are also exploring the use of Cephalexin in combination with other antibiotics to treat more severe infections. Ongoing studies aim to optimize Cephalexin dosing strategies to reduce the risk of resistance and improve patient outcomes.
Staying informed about the latest research is important. If you have any questions about Cephalexin or your treatment plan, consider scheduling a telemedicine visit with one of our providers for personalized advice on Cephalexin antibiotic therapy.
