Penicillin v potassium
Generic Name: penicillin v potassium (PEN-i-SIL-in V poe-TAS-ee-um)
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 a tetracycline antibiotic
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 old 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 they may decrease penicillin v potassium's effectiveness
- Anticoagulants (eg, warfarin) or methotrexate because their actions and the risk of their side effects may be increased by penicillin v potassium
- Anticoagulants (eg, warfarin), oral contraceptives (birth control pills), or chloramphenicol because their effectiveness may be decreased by penicillin v potassium
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.
- Take penicillin v potassium by mouth. 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 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.
- Mild diarrhea is common with antibiotic use. However, a more serious form of diarrhea (pseudomembranous colitis) may rarely occur. This may develop while you use the antibiotic or within several months after you stop using it. 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).
- 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:
Seek medical attention right away if any of these SEVERE side effects occur:
Black, hairy tongue; irritation of the mouth or throat; mild diarrhea; nausea; upset stomach; vomiting.
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody stools or urine; fever, chills, or persistent sore throat; severe or persistent diarrhea; stomach pain or cramps; unusual bruising or bleeding; 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 about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.
If OVERDOSE is suspected:
Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately. Symptoms may include diarrhea; nausea; vomiting.Proper storage of penicillin v potassium:
Store penicillin v potassium at room temperature, between 59 and 86 degrees F (15 and 30 degrees C) in a tightly closed container. Store away from heat, moisture, and light. Do not store in the bathroom. Keep penicillin v potassium out of the reach of children and away from pets.
- 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.
- Check with your pharmacist about how to dispose of unused medicine.
This information should not be used to decide whether or not to take penicillin v potassium or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about penicillin v potassium. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to penicillin v potassium. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using penicillin v potassium.
Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using this medicine.
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