For most infections, you should feel better within a few days. With serious swelling including dental infections , the medicine will start working within a few days but it may take longer before your symptoms start to get better. For some of the infections that metronidazole is used for, you may only begin to notice an improvement after a week. When using the cream or gel to treat rosacea, you may have to wait a few weeks before you see any improvement.
It's very important that you keep taking metronidazole until the course is finished. Do this even if you feel better. It will help stop the infection coming back.
Tell your doctor if you still do not feel better 2 or 3 days after finishing your course of metronidazole. Also tell them if, at any time, you start to feel worse. Metronidazole does not stop any type of contraception from working, including the combined pill and emergency contraception. However, if metronidazole makes you vomit or have severe diarrhoea, 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 metronidazole. This is more common if you're using the vaginal gel.
It happens because antibiotics kill the normal harmless bacteria that help to protect you against thrush. There's no clear evidence to suggest that taking metronidazole will reduce fertility in either men or women. However, speak to a pharmacist or doctor before taking it if you're trying to get pregnant. However, very rarely, some people suffer from drowsiness or blurred vision. Do not drive or ride a bike until you stop feeling drowsy and your vision is clear. Do not drink alcohol while you're taking metronidazole, including for 2 days afterwards.
This gives the medicine time to leave your body. This is important because metronidazole can react with alcohol to cause a number of side effects. These include feeling and being sick, stomach pain, hot flushes, a pounding heartbeat palpitations and a headache. You must not have any alcohol in either your food or drink while taking metronidazole - and for 2 days afterwards.
Page last reviewed: 6 December Next review due: 6 December Metronidazole On this page About metronidazole Key facts Who can and cannot take metronidazole Tablets, liquid or suppositories Cream or gel Vaginal gel Side effects How to cope with side effects Pregnancy and breastfeeding Cautions with other medicines Common questions.
About metronidazole Metronidazole is an antibiotic. Metronidazole is only available on prescription. Help us improve our website Can you answer a quick question about your visit today? The most common side effects of metronidazole tablets, liquid, suppositories or vaginal gel are feeling or being sick, diarrhoea, and a slight metallic taste in your mouth. Do not drink alcohol while taking a course of metronidazole tablets, liquid, suppositories or vaginal gel, or for 2 days after finishing treatment.
Alcohol can cause side effects such as feeling and being sick, stomach pain, hot flushes, a pounding heartbeat palpitations and a headache. For most infections, you'll start to feel better in a few days but for some it may take longer.
When treating rosacea, you may only notice a difference after several weeks. Metronidazole tablets or suppositories are called by the brand name Flagyl. Metronidazole cream is called by the brand names Rosiced or Rozex. To make sure the tablets, liquid or suppositories are safe for you, tell your doctor if you: have had an allergic reaction to metronidazole or any other medicines in the past are pregnant or breastfeeding have liver problems are having dialysis feel you will not be able to stop drinking alcohol while using metronidazole To make sure the external cream or gel is safe for you, tell your doctor if you: have had an allergic reaction to metronidazole or any other medicines including any creams or ointments in the past are pregnant or breastfeeding To make sure the vaginal gel is safe for you, tell your doctor if you: have had an allergic reaction to metronidazole or any other medicines in the past are pregnant or breastfeeding have liver problems feel you will not be able to stop drinking alcohol while using metronidazole think you may have vaginal thrush.
How long should I take it for? Important Carry on taking this medicine until you have finished the course, even if you feel better. What if I forget to take it? What if I take too much? How to put it on Put a thin layer of cream or gel onto the area you're treating and rub it in very gently. How long should I use it for? Important Carry on using this medicine until you have finished the course, even if you feel better. What if I forget to use it?
What if I use too much? How to use it Follow the instructions that come in the packaging along with your medicine. Do not have sex while using the vaginal gel. If you accidentally use too much gel it's unlikely to harm you. Talk to your pharmacist or doctor if you're worried.
Common side effects of tablets, liquid, suppositories or vaginal gel Keep taking the medicine, but talk to your doctor or pharmacist if these side effects bother you or do not go away: feeling sick nausea being sick vomiting or diarrhoea metallic taste in your mouth or a furry tongue Serious side effects of tablets, liquid, suppositories or vaginal gel Serious side effects are rare and happen in less than 1 in 1, people.
Serious allergic reaction In rare cases, it's possible to have a serious allergic reaction anaphylaxis to metronidazole. Health Topics. Health Tools. Metronidazole Flagyl. RTU , Metryl Reviewed: November 19, You should not use this medicine if you are allergic to metronidazole, secnidazole, or tinidazole, or if: you drank alcohol in the past 3 days; you consumed foods or medicines that contain propylene glycol in the past 3 days; or you took disulfiram Antabuse within the past 14 days.
Tell your doctor if you have ever had: liver disease; kidney disease or if you are on dialysis ; a heart rhythm disorder; a stomach or intestinal disease such as Crohn's disease; a blood cell disorder such as anemia lack of red blood cells or low white blood cell WBC counts; a fungal infection anywhere in your body; or a nerve disorder.
Side Effects. Side Effects What are the side effects of Metronidazole Flagyl? Call your doctor at once if you have: new or worsening symptoms of infection; painful or difficult urination; confusion; a light-headed feeling like you might pass out ; vaginal itching or discharge; or blisters or ulcers in your mouth, red or swollen gums, trouble swallowing.
Stop taking the medicine and call your doctor right away if you have neurologic side effects more likely to occur while taking metronidazole long term : numbness, tingling, or burning pain in your hands or feet; vision problems, pain behind your eyes, seeing flashes of light; muscle weakness, problems with speech or coordination; trouble speaking or understanding what is said to you; a seizure; or fever, neck stiffness, and increased sensitivity to light.
Side effects may be more likely in older adults. Common side effects may include: depression, trouble sleeping, feeling irritable; headache, dizziness, weakness; nausea, vomiting, loss of appetite, stomach pain; diarrhea, constipation; unpleasant metallic taste; rash, itching; vaginal itching or discharge, pain during sex; mouth sores; or swollen, red, or "hairy" tongue.
Interactions What drugs and food should I avoid while taking Metronidazole Flagyl? Swallow the extended-release tablet whole and do not crush, chew, or break it. Store at room temperature away from moisture and heat. What should I do if I missed a dose of Metronidazole Flagyl? If you think you or someone else may have overdosed on: Metronidazole Flagyl , call your doctor or the Poison Control center. If someone collapses or isn't breathing after taking Metronidazole Flagyl , call What to Expect You should feel better after using metronidazole for a few days, but this will depend on the type of infection you have.
Additional Dosage Information Your dosage will depend on the type of infection you have, the formulation of metronidazole you use, and other factors.
See More. Medical Disclaimer Drugs A-Z provides drug information from Everyday Health and our partners, as well as ratings from our members, all in one place. The information within all other sections is proprietary to Everyday Health. Read more. Flagyl can also change the taste of alcohol. Take care to avoid alcohol from unexpected sources, such as over-the-counter cough suppressants or cold medications NyQuil , for example.
Milk thistle Silybum marianum may help to protect the liver from medications that may harm it, such as Flagyl. It has not been studied in relation to Flagyl, but it may be prescribed as a complementary therapy. Flagyl, also known as metronidazole or by the brand name Protostat is an anti-bacterial drug that treats anaerobic bacterial infections or protozoal infections.
It's important to follow your doctor's instructions when you take this medication. Side effects may include abdominal cramping, diarrhea, nausea, vomiting, loss of appetite, and headache. Some patients experience more serious side effects such as numbness or seizures. If you experience these severe side effects, call your doctor right away.
After the last dose of Flagyl is taken, wait at least 72 hours before drinking any alcohol. Drinking while on Flagyl can cause nausea, abdominal cramps, vomiting, and headaches. Some types of over-the-counter cough suppressant and cold products contain small amounts of alcohol, so be careful if you decide to take one.
No, metronidazole is not available over the counter. You will need to contact your doctor to receive a prescription. Most people begin to feel better after a few days of taking metronidazole or Flagyl.
However, even if you feel better, the infection may still be present, which is why it's important to take the full course of medication as prescribed. Flagyl should never be used to treat a yeast infection. In fact, using it might worsen the effects of a yeast infection. Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Howe K, Kissinger PJ. Single-dose compared with multidose metronidazole for the treatment of trichomoniasis in women: a meta-analysis.
Sex Transm Dis. Role of antibiotics for treatment of inflammatory bowel disease. World J Gastroenterol. Therapeutic uses of metronidazole and its side effects: an update. Eur Rev Med Pharmacol Sci. Treatment of infections caused by metronidazole-resistant Trichomonas vaginalis.
Clin Microbiol Rev. The use of metronidazole during pregnancy: a review of evidence. Curr Drug Saf. National Library of Medicine. Updated August 24, Updated September 29, Metronidazole-induced cerebellar toxicity. Neurol Int. Published Apr 1. Am J Forensic Med Pathol.
Possible nephrotoxic interaction of lithium and metronidazole. The effects of milk thistle Silybum marianum on human cytochrome P activity.
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