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All about: Penicillin V Potassium

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Generic Name: Penicillin V Potassium Tablets (pen-i-SILL-in V poe-TASS-ee-uhm)
Brand Name: Examples include Penicillin-VK and Veetids

Penicillin V Potassium is used for:

Treating some types of infections caused by certain bacteria.

Penicillin V Potassium is a penicillin antibiotic. It works by interfering with the formation of the bacteria's cell wall while it is growing. This weakens the cell wall and kills the bacteria.

Do NOT use Penicillin V Potassium if:

  • you are allergic to any ingredient in Penicillin V Potassium or to other penicillins
  • you are taking tetracyclines

Contact your doctor or health care provider right away if any of these apply to you.

Before using Penicillin V Potassium :

Some medical conditions may interact with Penicillin V Potassium . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines, foods, or other substances
  • if you have diarrhea or a stomach infection, especially in children 9 years of age or younger

Some MEDICINES MAY INTERACT with Penicillin V Potassium . Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Chloramphenicol, guar gum, or tetracyclines because the effectiveness of Penicillin V Potassium may be decreased
  • Anticoagulants (eg, warfarin) or methotrexate because the actions and side effects of these medicines may be increased
  • Anticoagulants (eg, warfarin), chloramphenicol, or oral contraceptives (birth control pills) because the effectiveness of these medicines may be decreased

This may not be a complete list of all interactions that may occur. Ask your health care provider if Penicillin V Potassium may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use Penicillin V Potassium :

Use Penicillin V Potassium as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Penicillin V Potassium is best absorbed when taken on an empty stomach (1 hour before or 2 hours after meals), but may be taken with food.
  • Penicillin V Potassium should be taken at least 2 hours after KHAT.
  • Penicillin V Potassium works best if it is taken at the same time each day.
  • To clear up your infection completely, take Penicillin V Potassium for the full course of treatment. Keep taking it even if you feel better in a few days.
  • Do not miss any doses. If you miss a dose of Penicillin V Potassium , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use Penicillin V Potassium .

Important safety information:

  • Do not take Penicillin V Potassium if you have had a severe allergic reaction to a penicillin antibiotic (eg, amoxicillin, ampicillin) or a cephalosporin antibiotic (eg, cefaclor, cephalexin, cefuroxime, cefadroxil). A severe allergic reaction includes a severe rash, hives, breathing difficulties, or dizziness. Ask your health care provider if you are unsure if you are allergic to Penicillin V Potassium .
  • Long-term or repeated use of Penicillin V Potassium may cause a second infection. Tell your doctor if signs of a second infection occur. Your medicine may need to be changed to treat this.
  • Contact your doctor right away if stomach pain or cramps, severe diarrhea, or bloody stools occur. Do not treat diarrhea without first checking with your doctor.
  • Diabetes patients - Penicillin V Potassium may cause the results of some tests for urine glucose to be wrong. Ask your doctor before you change your diet or the dose of your diabetes medicine.
  • Hormonal birth control (eg, birth control pills) may not work as well while you are using Penicillin V Potassium . To prevent pregnancy, use an extra form of birth control (eg, condoms).
  • Lab tests may be performed while you use Penicillin V Potassium . These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
  • PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Penicillin V Potassium while you are pregnant. Penicillin V Potassium is found in breast milk. If you are or will be breast-feeding while you use Penicillin V Potassium , check with your doctor. Discuss any possible risks to your baby.

Possible side effects of Penicillin V Potassium :

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Black, hairy tongue; irritation of the mouth or throat; mild diarrhea; nausea; upset stomach; vomiting.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody stools or urine; chills; fast heartbeat; fever; headache; severe diarrhea; skin eruptions; stomach pain/cramps; vaginal irritation or itching; worsening of skin lesions.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider. You may report side effects to the FDA at 1-800-FDA-1088 (1-800-332-1088) or at http://www.fda.gov/medwatch.

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center (http://www.aapcc.org/findyour.htm), or emergency room immediately. Symptoms may include diarrhea; nausea; vomiting.

Proper storage of Penicillin V Potassium :

Store Penicillin V Potassium at room temperature, between 68 and 77 degrees F (20 and 25 degrees C) in a tight container. Store away from heat, moisture, and light. Keep Penicillin V Potassium out of the reach of children and away from pets.

General information:

  • If you have any questions about Penicillin V Potassium , please talk with your doctor, pharmacist, or other health care provider.
  • Penicillin V Potassium is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.

This information is a summary only. It does not contain all information about Penicillin V Potassium . If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.

Issue Date: September 5, 2007
Database Edition 07.3.1.003
Copyright © 2007 Wolters Kluwer Health, Inc.

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