In rare cases, phenoxymethylpenicillin can cause a serious allergic reaction anaphylaxis. You could be having a serious allergic reaction and may need immediate treatment in hospital. You can report any suspected side effect to the UK safety scheme. It's usually safe to take phenoxymethylpenicillin during pregnancy and while breastfeeding. For safety, tell your doctor if you're trying to get pregnant, already pregnant, or breastfeeding.
There are many medicines that don't mix well with phenoxymethylpenicillin. Tell your doctor if you're taking these medicines before you start taking phenoxymethylpenicillin:. There are no known problems with taking herbal remedies and supplements with phenoxymethylpenicillin.
For safety, tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements. Phenoxymethylpenicillin is an antibiotic. It works by killing the bacteria that cause infection. Tell your doctor or pharmacist if you have had an allergic reaction to penicillin or any other medicine in the past.
If you're allergic to penicillin, you'll be allergic to all penicillin-based medicines , including phenoxymethylpenicillin, and your doctor will prescribe a different type of antibiotic. It's very important that you keep taking phenoxymethylpenicillin until your course is finished. Do this even if you feel better. It'll help stop the infection coming back. Tell your doctor if you don't start feeling better after taking phenoxymethylpenicillin for 3 days. If you're taking phenoxymethylpenicillin to prevent infection for example, if you have sickle cell disease or have had chorea, rheumatic fever or your spleen removed , you may have to take it for the rest of your life.
Phenoxymethylpenicillin is generally safe when prescribed long term to prevent infections. There are no additional known side effects. But if you develop diarrhoea that lasts for more than a couple of days, ask your pharmacist or doctor for advice. Phenoxymethylpenicillin and other penicillins, like amoxicillin , are antibiotics that are widely used to treat a variety of infections, including skin infections, chest infections and urinary tract infections UTIs.
Not all antibiotics are suitable for every infection. Your doctor will choose an antibiotic that's suitable for the type of infection you have.
But if phenoxymethylpenicillin makes you have severe diarrhoea or vomiting - and you continue to vomit or pass 6 to 8 watery stools over 24 hours - your contraceptive pills may not protect you from pregnancy. If this happens, follow the instructions in the leaflet that comes with your contraceptive pills. Read more about what to do if you're on the pill and you're being sick or have diarrhoea.
Some people get a fungal infection called thrush after taking a course of antibiotics like phenoxymethylpenicillin. Antibiotics kill the normal harmless bacteria that help to defend against thrush. Symptoms include redness and itching in the mouth. Women may get vaginal itching. There's no firm evidence to suggest that taking phenoxymethylpenicillin will reduce fertility in either men or women.
But for safety, speak to a pharmacist or your doctor before taking it if you're trying to get pregnant. Doron S, Gorbach S. Bacterial infections: overview. International Encyclopedia of Public Health. Coppoc GL. Penicillin derivatives. Purdue Research Foundation. US Food and Drug Administration. Penicillin VK: label. Published Your Privacy Rights. To change or withdraw your consent choices for VerywellHealth.
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I Accept Show Purposes. Table of Contents View All. Table of Contents. Before Taking. Side Effects. Do not freeze it. It is important to keep all medication out of sight and reach of children as many containers such as weekly pill minders and those for eye drops, creams, patches, and inhalers are not child-resistant and young children can open them easily.
To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location — one that is up and away and out of their sight and reach.
Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them.
However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. In case of overdose, call the poison control helpline at If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at Do not let anyone else take your medication. Your prescription is probably not refillable.
If you still have symptoms of infection after you finish the penicillin V potassium, call your doctor. It is important for you to keep a written list of all of the prescription and nonprescription over-the-counter medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.
Generic alternatives may be available. Penicillin V Potassium pronounced as pen i sil' in. Symptoms of an overdose of this drug can include:. But if your symptoms are severe, call or go to the nearest emergency room right away.
What to do if you miss a dose: Take your dose as soon as you remember. But if you remember just a few hours before your next scheduled dose, take only one dose. Never try to catch up by taking two doses at once. This could result in dangerous side effects.
How to tell if the drug is working: Your symptoms and your infection should get better. As with all medications, the costs of penicillin V can vary. To find current prices for your area, check out GoodRx. Do not take this drug with food. Take it on an empty stomach, at least 1 hour before eating or 2 hours after eating.
A prescription for this medication is refillable. You should not need a new prescription for this medication to be refilled. Your doctor will write the number of refills authorized on your prescription. Your doctor may do blood tests to check how well your kidneys are working.
There are other drugs available to treat your condition. Some may be better suited for you than others. Talk to your doctor about other drug options that may work for you.
If you have an allergic reaction, call your doctor or local poison control center right away. If your symptoms are severe, call or go to the nearest emergency room. Taking it again could be fatal cause death. If you have severe allergies, you have a higher risk of developing a severe allergic reaction to penicillin.
This type of allergic reaction is called anaphylaxis. Symptoms can include throat swelling, trouble swallowing, wheezing, and trouble breathing. For people with asthma: If you have asthma, you have a higher risk of developing a severe allergic reaction to penicillin. For people with kidney problems: If you have kidney problems or a history of kidney disease, you may not be able to clear this drug from your body well. This may increase the levels of penicillin V in your body and cause more side effects.
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