Available in the form of an injection, capsules, or tablets, Flagyl® (metronidazole) can help fight a wide variety of bacterial infections. For example, this antibiotic can treat several sexually transmitted infections, and it is especially useful for treating infections caused by parasites and anaerobic bacteria, which do not require oxygen to survive).
Flagyl tablets are available in regular strength (250 mg and 500 mg) or long-acting forms (Flagyl ER 750 mg). This antibiotic is typically taken one to four times daily, depending on the particular use. You can take the regular tablets with food or on an empty stomach. However, the long-acting tablets must be taken on an empty stomach, at least one hour before or two hours after a meal.
(To learn more about taking these tablets, click Flagyl. This article takes an in-depth look at how the drug works, dosing tips, generic availability, and more.)