Taking Flagyl for Various Conditions and Treatment Tips

Flagyl Dosing for Anaerobic Infections

For serious anaerobic infections, Flagyl is usually given by IV in a hospital, at least at first. For the oral forms of Flagyl, the recommended dose for treating anaerobic infections is based on weight, 7.5 mg per kg (about 3.4 mg per pound) every six hours, up to a maximum of 4000 mg in any given 24-hour period. The medication is usually taken for 7 to 10 days, although some infections may require extended treatment.

Flagyl Dosing for Bacterial Vaginosis

The long-acting version, Flagyl ER, is approved for treating bacterial vaginosis. The recommended dosage of Flagyl ER is 750 mg once daily for seven days. Regular, short-acting Flagyl tablets and capsules are not approved for this use. Flagyl ER tablets are not approved for any other use except bacterial vaginosis.

General Information on Dosing With Flagyl

Some considerations for people taking Flagyl include the following:
  • Flagyl comes as tablets, long-acting tablets (Flagyl ER), and capsules (Flagyl 375). It is also available in an injectable form. It is taken one to four times daily, depending on the particular use.
  • You can take the regular tablets or capsules with food or on an empty stomach. However, long-acting Flagyl ER tablets must be taken on an empty stomach, at least one hour before or two hours after a meal.
  • Be sure to take your doses of this medication at the same time(s) each day. Taking doses too far apart may make the drug less effective, and taking them too close together may increase the risk of side effects.
  • For the medication to work properly, it must be taken as prescribed. Flagyl will not work if you stop taking it too soon.
  • If you are unsure about anything related to your dosage or Flagyl dosing in general, please talk with your doctor, nurse, or pharmacist.
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