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A healthcare provider may recommend Flagyl® (metronidazole) to treat various bacterial infections, including certain sexually transmitted infections. Several forms and strengths of this prescription medication are available.
In the tablet (pill) form, Flagyl is available in either regular-strength tablets (250 mg and 500 mg) or long-acting tablets (Flagyl ER 750 mg). This antibiotic also comes in the form of capsules (375 mg) or as an injection.
Flagyl is typically taken one to four times daily, depending on the particular use. Your can take the regular tablets with food or on an empty stomach. However, long-acting tablets must be taken on an empty stomach, at least one hour before or two hours after a meal.
(For a closer look at Flagyl pills, capsules, and injections, click Flagyl. This article explains how this medication works, potential side effects, general dosing guidelines, and information on what to tell your healthcare provider before using it.)
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Last reviewed by: Kristi Monson, PharmD;
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