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Dosage For Flagyl: Everything You Need To Know In 2023



Flagyl, also known as metronidazole, is a commonly prescribed antibiotic medication used to treat a variety of infections caused by bacteria and parasites. It is often used to treat infections in the reproductive system, digestive system, and skin. However, like all medications, it is important to take the correct dosage of Flagyl to ensure it is effective and does not cause any harmful side effects.

Understanding Flagyl Dosage

The dosage of Flagyl varies depending on the type and severity of the infection being treated, as well as the age and weight of the patient. In general, the recommended dosage for adults is usually between 500 and 750 milligrams, taken orally two to three times per day. For children, the dosage is based on their weight and is typically lower than the adult dosage.

It is important to follow your doctor’s instructions for taking Flagyl and to take the medication for the full duration of the prescribed course, even if you start feeling better before the medication is finished. Stopping the medication too soon can lead to a relapse of the infection and may cause the bacteria to become resistant to the medication.

Flagyl Dosage for Specific Infections

The dosage of Flagyl may be slightly different depending on the type of infection being treated. For example:

  • For bacterial vaginosis, the recommended dosage is 500 milligrams taken orally twice per day for 7 days.
  • For trichomoniasis, the recommended dosage is a single 2-gram dose taken orally.
  • For amoebic dysentery, the recommended dosage is 750 milligrams taken orally three times per day for 5 to 10 days.

Flagyl Dosage for Patients with Renal Impairment

Patients with renal impairment (i.e., decreased kidney function) may require a lower dosage of Flagyl to avoid any potential side effects. Your doctor will determine the appropriate dosage based on your kidney function.

Possible Side Effects of Flagyl

Like all medications, Flagyl can cause side effects, although not everyone will experience them. Some common side effects of Flagyl include nausea, vomiting, diarrhea, and loss of appetite. In some cases, Flagyl can also cause more serious side effects, such as seizures, numbness or tingling in the extremities, and an allergic reaction.

If you experience any side effects while taking Flagyl, it is important to speak with your doctor right away to determine if the medication needs to be adjusted or if you need to stop taking it altogether.


Dosage is an important aspect of taking any medication, including Flagyl. It is important to take the correct dosage for the duration of the prescribed course to ensure the medication is effective and to avoid any harmful side effects. If you have any questions or concerns about taking Flagyl or its dosage, be sure to speak with your doctor or pharmacist.

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