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Pen-V

Generic Name: penicillin V (pen i SILL in)
Brand Name: PC Pen VK, Pen-V

What is Pen-V (penicillin V)?

Penicillin V is an antibiotic in the penicillin group of drugs. It fights bacteria in your body.

Penicillin V is used to treat many different types of infections caused by bacteria, such as ear infections,.

Penicillin V may also be used for other purposes not listed in this medication guide.

What is the most important information I should know about Pen-V (penicillin V)?

Do not use this medication if you are allergic to penicillin V or to any other penicillin antibiotic, such as amoxicillin (Amoxil), ampicillin (Omnipen, Principen), carbenicillin (Geocillin), dicloxacillin (Dycill, Dynapen), or oxacillin (Bactocill).

Before using penicillin V, tell your doctor if you are allergic to cephalosporins such as Ceclor, Ceftin, Duricef, Keflex, and others, or if you have asthma, kidney disease, a bleeding or blood clotting disorder, a history of diarrhea caused by taking antibiotics, or a history of any type of allergy.

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Penicillin V can make birth control pills less effective, which may result in pregnancy. Before taking penicillin V, tell your doctor if you use birth control pills.

Take this medication for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Penicillin V will not treat a viral infection such as the common cold or flu.

Do not give this medication to another person, even if they have the same symptoms you do.

Antibiotic medicines can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or has blood in it, call your doctor. Do not use any medicine to stop the diarrhea unless your doctor has told you to.

What should I discuss with my healthcare provider before taking Pen-V (penicillin V)?

Do not use this medication if you are allergic to penicillin V or to any other penicillin antibiotic, such as:

  • amoxicillin (Amoxil, Amoxicot, Biomox, Dispermox, Trimox);

  • ampicillin (Omnipen, Principen);

  • carbenicillin (Geocillin);

  • dicloxacillin (Dycill, Dynapen); or

  • oxacillin (Bactocill).

Before using penicillin V, tell your doctor if you are allergic to any drugs (especially cephalosporins such as Ceclor, Ceftin, Duricef, Keflex, and others), or if you have:

  • asthma;

  • kidney disease;

  • a bleeding or blood clotting disorder;

  • a history of diarrhea caused by taking antibiotics; or

  • a history of any type of allergy.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take penicillin V.

FDA pregnancy category B. This medication is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.

Penicillin V can make birth control pills less effective, which may result in pregnancy. Before taking penicillin V, tell your doctor if you use birth control pills.

Penicillin V can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How should I take Pen-V (penicillin V)?

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

You may take penicillin V with or without food.

To be sure this medication is helping your condition, your blood will need to be tested on a regular basis. Your kidney or liver function may also need to be tested. Do not miss any scheduled visits to your doctor.

Shake the oral suspension (liquid) well just before you measure a dose. To be sure you get the correct dose, measure the liquid with a marked measuring spoon or medicine cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.

Take this medication for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Penicillin V will not treat a viral infection such as the common cold or flu.

Do not give penicillin V to another person, even if they have the same symptoms you do.

This medication can cause you to have unusual results with certain medical tests. Tell any doctor who treats you that you are using penicillin V.

Store penicillin V tablets at room temperature away from moisture, heat, and light.

Store liquid penicillin V in a refrigerator but do not allow it to freeze. Throw away any liquid penicillin that has not been used within 14 days after it was mixed at the pharmacy.

What happens if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at your next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include confusion, behavior changes, a severe skin rash, urinating less than usual, or seizure (black-out or convulsions).

What should I avoid while taking Pen-V (penicillin V)?

Antibiotic medicines can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or has blood in it, call your doctor. Do not use any medicine to stop the diarrhea unless your doctor has told you to.

Pen-V (penicillin V) side effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

  • diarrhea that is watery or bloody;

  • fever, chills, body aches, flu symptoms;

  • easy bruising or bleeding, unusual weakness;

  • urinating less than usual or not at all;

  • severe skin rash, itching, or peeling;

  • agitation, confusion, unusual thoughts or behavior; or

  • seizure (black-out or convulsions).

Less serious side effects are more likely to occur, such as:

  • nausea, vomiting, stomach pain;

  • vaginal itching or discharge;

  • headache;

  • swollen, black, or "hairy" tongue; or

  • thrush (white patches or inside your mouth or throat).

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.

See also: Side effects (in more detail)

What other drugs will affect Pen-V (penicillin V)?

Before taking penicillin V, tell your doctor if you are using any of the following drugs:

  • methotrexate (Rheumatrex, Trexall); or

  • probenecid (Benemid).

This list is not complete and there may be other drugs that can interact with penicillin V. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

  • Your pharmacist can provide more information about penicillin V.
  • Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
  • Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

Copyright 1996-2012 Cerner Multum, Inc. Version: 6.02. Revision Date: 2010-12-15, 5:01:39 PM.

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