PrescriptionGiant is a FREE prescription savings program that can save you up to 75% on your prescriptions with or without insurance!

Flagyl (Generic Metronidazole)

Actual product appearance may differ slightly.

Click the CARD below to print or take a screenshot on your mobile phone or tablet. There is no need to download another app!

If you would like to personalize your card enter your full name in the member name field below the card at this link and click the Update button.


Flagyl, also known by its generic name metronidazole, is an antibiotic medication commonly used to treat bacterial infections, including certain types of gastrointestinal and vaginal infections. While generally effective, there are some risks associated with taking Flagyl:

  • Allergic reactions: Some individuals may experience allergic reactions to Flagyl, which can range from mild skin rashes to severe reactions such as swelling of the face, throat, or difficulty breathing. If you experience any allergic symptoms, seek medical attention immediately.
  • Gastrointestinal effects: Common side effects of Flagyl include nausea, vomiting, diarrhea, and abdominal discomfort. These symptoms are usually mild and temporary but can be bothersome for some individuals.
  • Neurological side effects: In rare cases, Flagyl can cause neurological side effects such as seizures, dizziness, headaches, and confusion. These side effects are more common at higher doses or with prolonged use.
  • Interaction with alcohol: Flagyl can interact with alcohol, leading to a disulfiram-like reaction. This reaction can cause symptoms such as severe nausea, vomiting, flushing, and headache when alcohol is consumed while taking Flagyl. It’s essential to avoid alcohol during treatment and for at least 48 hours after stopping the medication.
  • Risk of overgrowth of non-susceptible organisms: Prolonged use of Flagyl can lead to the overgrowth of non-susceptible organisms, such as fungi or bacteria, which can cause secondary infections.
  • Potential for antibiotic resistance: Like all antibiotics, the overuse or misuse of Flagyl can contribute to the development of antibiotic-resistant bacteria, making future infections more difficult to treat.

It’s crucial to take Flagyl exactly as prescribed by your healthcare provider and to discuss any concerns or potential side effects with them. Additionally, inform your doctor of any other medications or supplements you are taking to avoid potential interactions.

Why is this medication prescribed?

Flagyl, or metronidazole, is prescribed for several reasons due to its effectiveness against various bacterial and protozoal infections. Here are some common reasons why Flagyl may be prescribed:

  • Bacterial Infections: Flagyl is often prescribed to treat bacterial infections, including those of the gastrointestinal tract, such as certain types of colitis (inflammation of the colon) and bacterial overgrowth in the intestines.
  • Protozoal Infections: It is also effective against certain protozoal infections, such as giardiasis (caused by Giardia lamblia) and trichomoniasis (caused by Trichomonas vaginalis).
  • Anaerobic Infections: Flagyl is particularly useful in treating infections caused by anaerobic bacteria, which thrive in environments without oxygen. These infections can occur in various parts of the body, including the abdomen, pelvis, skin, and soft tissues.
  • Dental Infections: It may be prescribed for dental infections such as periodontal abscesses.
  • Pelvic Inflammatory Disease (PID): Flagyl is sometimes used in combination with other antibiotics to treat pelvic inflammatory disease, a serious infection of the female reproductive organs.

How should this medicine be used?

Flagyl is available in various forms, including tablets, capsules, and oral suspensions, as well as topical forms for certain infections. The dosage and duration of treatment will depend on the specific condition being treated, the severity of the infection, and other factors such as the patient’s age and overall health.

Here are some general guidelines for using Flagyl:

  • Follow Prescribed Dosage: Take Flagyl exactly as prescribed by your healthcare provider. Do not take more or less than the prescribed dose, and do not stop taking the medication before completing the full course of treatment unless directed to do so by your doctor.
  • Take with Food: Flagyl can be taken with or without food. However, taking it with food may help reduce stomach upset.
  • Avoid Alcohol: It’s important to avoid consuming alcohol while taking Flagyl and for at least 48 hours after completing the course of treatment, as it can cause a severe reaction.
  • Complete the Full Course: Even if you start feeling better before completing the full course of treatment, continue taking Flagyl as directed by your healthcare provider. Stopping the medication prematurely can lead to the return of the infection or the development of antibiotic resistance.
  • Store Properly: Store Flagyl at room temperature away from moisture and heat. Follow any specific storage instructions provided with the medication.

As with any medication, it’s essential to discuss any questions or concerns with your healthcare provider before starting treatment with Flagy

Other uses for this medicine

  • Flagyl is primarily prescribed for bacterial and parasitic infections, including certain types of bacterial vaginosis, pelvic inflammatory disease, gastrointestinal infections, and certain types of sexually transmitted infections.
  • It may also be used in combination with other medications to treat certain types of ulcers caused by Helicobacter pylori bacteria.

What special precautions should I follow?

As for special precautions to follow when taking Flagyl, here are some important considerations:

  • Allergies: Inform your healthcare provider if you have any allergies to metronidazole or other medications before starting treatment.
  • Pregnancy and Breastfeeding: Flagyl should be used with caution during pregnancy, especially during the first trimester, and only if the potential benefits outweigh the risks. It may pass into breast milk, so discuss the risks and benefits with your doctor if you are breastfeeding.
  • Liver Function: Flagyl is metabolized in the liver, so individuals with liver disease or impaired liver function may require dosage adjustments or closer monitoring while taking the medication.
  • Neurological Effects: Flagyl can rarely cause neurological side effects such as seizures, dizziness, and confusion. If you experience any unusual symptoms, notify your healthcare provider immediately.
  • Avoid Alcohol: As mentioned earlier, avoid consuming alcohol while taking Flagyl and for at least 48 hours after completing the course of treatment, as it can cause a severe reaction.
  • Drug Interactions: Inform your doctor about all medications, supplements, and herbal products you are taking, as Flagyl can interact with certain medications, including blood thinners and drugs that affect liver enzymes.
  • Kidney Function: Flagyl is excreted primarily by the kidneys, so individuals with kidney disease or impaired kidney function may require dosage adjustments or closer monitoring.

Always follow your healthcare provider’s instructions and recommendations regarding the use of Flagyl, and do not hesitate to ask any questions or express concerns you may have about the medication.

What special dietary instructions should I follow?

Regarding dietary instructions for Flagyl, there are no specific dietary restrictions associated with this medication. However, taking Flagyl with food or milk may help reduce stomach upset. If you have any concerns about diet and Flagyl, consult your healthcare provider for personalized advice.

What should I do if I forget a dose?

If you forget to take a dose of Flagyl, take it as soon as you remember. However, if it’s almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to make up for the missed one. If you’re unsure about what to do, consult your healthcare provider or pharmacist for guidance. It’s essential to maintain a consistent dosing schedule to ensure the effectiveness of Flagyl in treating your infection.

What side effects can this medication cause?

Flagyl (metronidazole) can cause various side effects, although not everyone experiences them. Common side effects of Flagyl may include:

  • Nausea and vomiting: These gastrointestinal symptoms are among the most common side effects of Flagyl. Taking the medication with food or milk may help reduce these symptoms.
  • Diarrhea or constipation: Changes in bowel habits, including diarrhea or constipation, can occur while taking Flagyl.
  • Abdominal discomfort: Some individuals may experience abdominal pain, cramping, or bloating while taking Flagyl.
  • Loss of appetite: Flagyl may decrease appetite in some people.
  • Metallic taste: Some individuals may notice a metallic or bitter taste in their mouth while taking Flagyl.
  • Dry mouth: Flagyl can sometimes cause dry mouth or an unpleasant taste sensation in the mouth.
  • Headache: Headaches are a possible side effect of Flagyl, although they are usually mild.
  • Dizziness or lightheadedness: Some people may experience dizziness or lightheadedness while taking Flagyl.
  • Dark urine: Flagyl can cause darkening of the urine, which is usually harmless but should be monitored.
  • Skin rash or itching: Allergic reactions to Flagyl can cause skin rash, itching, or hives in some individuals.

Less common but more serious side effects of Flagyl may include:

  • Neurological side effects: Rarely, Flagyl can cause neurological side effects such as seizures, confusion, hallucinations, or peripheral neuropathy (nerve damage).
  • Blood disorders: Flagyl may rarely cause changes in blood cell counts, leading to conditions such as leukopenia (low white blood cell count), thrombocytopenia (low platelet count), or agranulocytosis (severe decrease in white blood cells).
  • Liver toxicity: In rare cases, Flagyl can cause liver toxicity or liver damage, leading to symptoms such as jaundice (yellowing of the skin and eyes), abdominal pain, or dark urine.

If you experience any severe or persistent side effects while taking Flagyl, contact your healthcare provider immediately. It’s essential to report any adverse reactions to your doctor to ensure proper management and adjustment of your treatment plan if necessary.

What should I know about storage and disposal of this medication?

Storage and disposal of Flagyl:

  • Storage: Store Flagyl tablets and capsules at room temperature, away from moisture and heat. Avoid storing the medication in the bathroom or near sources of moisture. Keep Flagyl suspension (liquid) in the refrigerator, but do not freeze it. Check the specific storage instructions provided with your medication, and keep it out of reach of children and pets.
  • Disposal: Dispose of any unused or expired Flagyl medication properly. Do not flush it down the toilet or pour it down the drain unless instructed to do so by your healthcare provider or pharmacist. Instead, consult your local pharmacy or healthcare facility for information on safe medication disposal methods, such as medication take-back programs or community disposal events.

In case of emergency/overdose

In case of emergency or overdose involving Flagyl, take the following steps:

  • Seek medical attention: If you suspect that you or someone else has overdosed on Flagyl or is experiencing severe symptoms such as seizures, difficulty breathing, or loss of consciousness, call emergency services (such as 911 in the United States) immediately.
  • Contact poison control: You can also contact your local poison control center or national poison helpline for guidance on what to do in case of a Flagyl overdose. They can provide instructions on managing the situation and may advise you on whether further medical treatment is necessary.
  • Provide information: When seeking medical help, be prepared to provide information about the type and amount of Flagyl ingested, as well as any symptoms experienced. This information will assist healthcare professionals in determining the appropriate course of action.

What other information should I know?

  • Follow-up appointments: Attend any follow-up appointments scheduled by your healthcare provider while taking Flagyl to monitor your progress and ensure the effectiveness of treatment. Your doctor may also perform tests to check for any potential side effects or complications.
  • Complete the full course: Finish the full course of Flagyl as prescribed by your healthcare provider, even if you start feeling better before completing the medication. Stopping the medication prematurely can lead to the return of the infection or the development of antibiotic resistance.
  • Avoid alcohol: As mentioned earlier, it’s important to avoid consuming alcohol while taking Flagyl and for at least 48 hours after completing the course of treatment, as it can cause a severe reaction.
  • Keep appointments: Keep all appointments with your healthcare provider, including laboratory appointments if blood tests are recommended while taking Flagyl.

By following these guidelines and staying informed about Flagyl, you can help ensure the safe and effective use of the medication.

Copyright © 2023