Generic Name: Cephalexin

  • What is Keflex?

    Keflex is an antibiotic used to treat infections of the lungs, middle ear, bones, skin, and urinary systems.

  • What is the most important information I should know about Keflex?

    If you are allergic to either penicillin or cephalosporin antibiotics in any form, consult your doctor before taking Keflex. If you take the drug and feel signs of a reaction, seek medical attention immediately.

    Your doctor will only prescribe Keflex to treat a bacterial infection. Keflex will not cure a viral infection such as the common cold. It is important to take the full dosage schedule of Keflex, even if you're feeling better in a few days. Not completing the full dosage schedule may decrease the drug's effectiveness and increase the chances that the bacteria may become resistant to Keflex and similar antibiotics.

    Diarrhea is a common problem caused by antibiotics, which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, people can develop watery and bloody stools (with or without stomach cramps and fever) even as late as 2 or more months after having taken the last dose of the antibiotic. If this occurs, contact your doctor as soon as possible.

  • Who should not take Keflex?

    Do not take Keflex if you are allergic to this drug, any cephalosporin antibiotics, or penicillin.

  • What should I tell my doctor before I take the first dose of Keflex?

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Keflex. Also, talk to your doctor about your complete medical history, especially if you have kidney or liver disease, are taking a blood thinner, or have a history of stomach or intestinal disease such as inflammation of the large intestine.

  • What is the usual dosage?

    The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.

    Your doctor will prescribe the appropriate dose for you based on the type of infection you have.

  • How should I take Keflex?

    Take Keflex at even intervals around the clock as prescribed by your doctor.

  • What should I avoid while taking Keflex?

    Do not give Keflex to other people and do not use it for other infections.

  • What are possible food and drug interactions associated with Keflex?

    If Keflex is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Keflex with metformin and probenecid.

  • What are the possible side effects of Keflex?

    Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.

    Side effects may include: diarrhea, allergic reactions, abdominal pain, rash, fever, seizures

  • Can I receive Keflex if I am pregnant or breastfeeding?

    The effects of Keflex during pregnancy and breastfeeding are unknown. Tell your doctor immediately if you are pregnant, plan to become pregnant, or are breastfeeding.

  • What should I do if I miss a dose of Keflex?

    If you miss a dose of Keflex, take the missed dose as soon as you remember. However, if it is almost time for your next dose, skip the one you missed and return to your regular dosing schedule. Do not take two doses at once.

  • How should I store Keflex?

    Store at room temperature. Store the liquid suspension in a refrigerator and throw out any unused medication after 14 days.

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I'm Kristen Dore, PharmD. Welcome to PDR Health!

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