Generic Name: Penicillin G

  • What is Pfizerpen?

    Pfizerpen is an antibacterial agent (in the form of an injection) used to treat many different types of severe bacterial infections, including strep and staph infections, meningitis, anthrax, gonorrhea, syphilis, and diphtheria. It is also used to prevent infections of the heart valves in people with certain heart conditions who will undergo dental or upper respiratory tract surgical procedures.

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

    Do not use this medication if you are allergic to penicillin or have had an allergic reaction to a cephalosporin antibiotic. There is a possibility that you are allergic to both types of medications, and if a reaction occurs, it could be extremely severe. If you take the drug and notice any signs of a reaction such as a skin rash, chills, fever, or swelling, seek medical attention immediately.

    Pfizerpen will not treat a viral infection such as the common cold.

    Pfizerpen should be used with caution if you have a history of significant allergies and/or asthma.

    While it is common to feel better early in the course of therapy, you should use this medication exactly as directed by your physician for the entire length of time prescribed.

    After you have finished your treatment, your doctor may want to perform tests to make sure your infection has completely cleared up.

  • Who should not take Pfizerpen?

    Do not use Pfizerpen if you are allergic to penicillin or cephalosporin antibiotics.

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

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Pfizerpen. Also talk to your doctor about your complete medical history, especially if have ever had asthma or significant allergies, or if you have heart, liver, or kidney disease.

  • 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.

    Adults and Children: Your doctor will prescribe the appropriate dosage for you.

  • How should I take Pfizerpen?

    Your doctor, nurse, or other healthcare provider will give you this injection. Dosage and duration of therapy will be determined by your age and type of the infection.

    Your doctor will only prescribe Pfizerpen to treat a bacterial infection. Skipping doses or not completing the full course of therapy may decrease the drug's effectiveness, increase the chances for bacterial resistance, and will not be treatable by Pfizerpen or other antibacterial drugs in the future.

  • What should I avoid while taking Pfizerpen?

    Avoid skipping doses or not completing the full course of therapy.

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

    If Pfizerpen 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 Pfizerpen with other antibiotics such as erythromycin and tetracycline or the gout medication probenecid.

  • What are the possible side effects of Pfizerpen?

    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: skin rash, chills, fever, swelling or irritation at injection site, joint pain, irregular heartbeats

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

    Pfizerpen should be used during pregnancy only when clearly needed. If you are pregnant or plan to become pregnant, inform your doctor immediately. Since Pfizerpen may appear in breast milk, you should consult your doctor if you plan to breastfeed your baby.

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

    Pfizerpen should be given under special circumstances determined by your doctor. If you miss your scheduled dose, it is best to speak to your healthcare provider for advice.

  • How should I store Pfizerpen?

    Your physician will store this medication.

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

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