Sofie Wise

Marea Harris

Read more posts by this author.

About Author — Marea is a professional writer with over 7 years' experience in the industry. She holds a Bachelor's degree in Business Administration and a Master's degree in Marketing.

Most PlushCare articles are reviewed by M.D.s, Ph.Ds, N.P.s, nutritionists and other healthcare professionals. Click here to learn more and meet some of the professionals behind our blog.

If you’re suffering from a bacterial infection, there are a range of prescription medications that a doctor can recommend to help relieve your condition. Among the available options is Flagyl – the brand name for metrodinazole. Used to treat infections of both bacterial and protozoal origins, this medication can be an effective solution against conditions like pelvic inflammatory disease, endocarditis, and bacterial vaginosis.

While it might be possible to buy Flagyl online, you first need to acquire a prescription for it from your physician. Find out here whether you would benefit from the use of Flagyl and how you can get a prescription for it without having to leave home.

What is Flagyl?

Flagyl is the brand name for metrodinazole. It’s an antibiotic and antiprotozoal medication that used to treat a range of different kinds of infection. Keep in mind however that Flagyl can’t be used to treat viral or fungal infections.

How Does Flagyl Work?

The active ingredient in Flagyl works to eradicate an infection by interfering with the DNA of the bacteria specimen active in the infection. In effect, the medication prevents the proliferation of bacterial cells, causing them to die off as the treatment period progresses.

Flagyl Dosage and Treatment

When using antibiotic medications, it’s imperative that you follow your doctor’s instructions as closely as possible. The reason for this is two-fold.

First, following the dosage guarantees a consistent concentration of antibiotic medication in your system to efficiently suppress the attack.

Second, making sure that you see through the entire treatment period will ensure that the bacteria does not reinfect your system.

If you start to feel better during the middle of treatment, do not cease the use of medication even if all of your symptoms have subsided. Trace amounts of the bacteria may still be in your system, and these organisms can learn the chemical footprint of the antibiotics you use. When that happens, the bacteria may become resistant to Flagyl in the future.

The dosage numbers for Flagyl are not the same across different patients. However, your doctor will likely prescribe Flagyl within the following possible ranges:


  • One-day treatment course: 2 grams given as one dose, or two separate doses of equal amount
  • Seven-day treatment course: 250 mg three times everyday for a period of seven days


  • 500 to 750 mg three times daily for a five to 10 day treatment period

Anaerobic Bacterial Infections

  • 7.5 mg for every kilogram of body weight every 6 hours
  • Not to exceed a maximum daily dosage of 4 grams
  • Usually extends from 7 to 10 days of treatment

Keep in mind that Flagyl can be used to treat a range of other bacterial and protozoal infections. Ask your doctor whether Flagyl can be a sound solution for your specific condition in order to determine the best treatment plan for you.

Flagyl can be taken on an empty stomach, but if you feel stomach pain after a dose, you might be better off taking the medication after meals.

Benefits of Flagyl

When used within the right dosage and treatment period parameters, Flagyl can help completely eradicate a bacterial or protozoal infection, eliminating all symptoms associated with the infection, and paving the way for optimal health and occupational functioning.

Side Effects of Flagyl

When you take Flagyl, you can expect that there will be some side effects. As long as these reactions are tolerable, there shouldn’t be a reason for you to worry. However, in the event that you feel overwhelmed by the severity or the number of side effects you’re experiencing, you can reach out to your doctor to determine whether you’d be better off taking an adjusted dosage or a different antibiotic all together.

Some of the side-effects that occur due to the use of Flagyl may include:

If you experience any of these side effects and you feel that they’re tolerable, then you might not have to tell your doctor. However, if you experience any of the following adverse reactions, cease the use of Flagyl immediately and contact your doctor. These may be an indication of poor drug metabolism, which may lead to life-threatening complications.

  • Bloody or tarry stools
  • Blood in urine
  • Loss of balance
  • Loss of consciousness
  • Severe stomach and back pain
  • Big, red, raised, itchy patches on the skin
  • Feeling of pelvic pressure
  • Rapid sudden weight loss
  • Pain or tenderness around the face
  • Painful intercourse

Other Flagyl Considerations

Yes, Flagyl can be an effective treatment for infection, but that doesn’t mean it will be safe for everyone. This medication can have negative interactions with certain other drugs and conditions. In this case, your doctor may recommend that you use a different medication all together.

Some of the medications that can’t be used in combination with Flagyl include:

  • Amprenavir
  • Anisindione
  • BCG
  • Busulfan
  • Cholera vaccine
  • Dicumarol
  • Disulfiram
  • Ehtanol
  • Thyphoid vaccine
  • Warfarin

If you have any of the following medical conditions, then it is highly advised that you do not use Flagyl:

  • Colitis
  • Blood dyscrasias
  • Neurologic toxicity
  • Alcoholism
  • Undergoing dialysis
  • Liver disease or dysfunction
  • High sodium

Current studies have found that Flagyl does not cause any unwanted effects on unborn children, which means that pregnant women may be able to take the medication safely without impacting their baby in utero. In the same way, Flagyl doesn’t pose a threat to breastfeeding babies.

However, some experts do recommend that women who take Flagyl for longer periods may have to discard their milk for safety purposes. Make sure you discuss your pregnancy or your breastfeeding situation with your doctor before accepting a prescription for Flagyl.

Can You Buy Flagyl Online?

If you do a little research, you will likely find a number of online pharmacies that offer to sell you prescription medications like Flagyl. But before you dive at the convenient opportunity of buying medication online, make sure you’ve chosen a legitimate source. Even online pharmacies can’t dispense medications without the proper prescription. So before you go out in search of an online source for Flagyl, you might first have to see a doctor to provide you the prescription you need.

For your convenience and ease, there are online services like PlushCare that aim to offer patients sound medical advice without having to leave their homes. If your PlushCare doctor decides that you would benefit from the use of Flagyl, then they may provide you a prescription for it as well as any other medication you might need to achieve your full health potential.

Think you may need a Flagyl prescription? Book an appointment with a PlushCare physician and get a prescription today!

Read More About Getting a Prescription Online:


Can You Get Ciproflaxin Online?

Table of Contents What is Ciproflaxin?How Does Ciproflaxin Work?Ciproflaxin Dosage and TreatmentBenefits of CiproflaxinSide Effects of CiproflaxinConsiderations and Precautions of CiproflaxinCan You Buy Ciproflaxin Online?Read More About Getting a Prescription Online: Can You Get Ciproflaxin Online? Antibiotics are a staple of modern medicine that provide many patients with easy and effective treatment for various infections […]

Christina Wedberg

Can You Get a Keflex Prescription Online?

Table of Contents What is Keflex?How Does Keflex Work?Keflex Dosage and TreatmentBenefits of KeflexSide Effects of KeflexKeflex Considerations and PrecautionsCan You Buy Keflex Online?Read More About Getting a Zithromax Prescription Online Can You Get a Keflex Prescription Online? Also called cephalexin monohydrate, Keflex is a medication that’s used to treat bacterial infections. Before being able […]

Sofie Wise

Can You Get an Amoxil 500 Prescription Online?

Table of Contents What is Amoxil 500?How Does Amoxil 500 Work?Amoxil 500 Dosage and TreatmentBenefits of Amoxil 500Side Effects of Amoxil 500Considerations and Precautions of Amoxil 500Amoxil 500 InteractionsOther Amoxil 500 ConsiderationsAmoxil 500 and Pregnancy or BreastfeedingCan You Buy Amoxil 500 Online?Read More About Getting an Amoxil 500 Prescription Online Can You Get an Amoxil […]

Jennifer Nelson

Antibiotics For Tooth Infection

Table of Contents Best Antibiotics for Tooth InfectionWhy Should You Treat a Bacterial Tooth Infection With Antibiotics?When To Skip Antibiotics For Tooth InfectionTooth Infection CausesTooth Infection SymptomsHow Long Should I Take Antibiotics For a Tooth Infection?Home Remedies for Tooth InfectionsRead More About Antibiotics For Tooth Infection Antibiotics For Tooth Infection Do you need antibiotics for […]

Dr. Umer Khan

Antibiotics for Pneumonia

Table of Contents Who is at Risk of Pneumonia?Pneumonia SymptomsWhen To See a DoctorDiagnosis and Pneumonia TreatmentHow Plushcare worksRead more about pneumonia Antibiotics for Pneumonia Pneumonia is a condition in which the air sacs in one or both the lungs are inflamed due to an infection caused by bacteria, fungi, viruses or parasites. The air […]

Mark Spera