There are four different types of oral metronidazole: 500 mg tablets, 250 mg tablets, 375 mg capsules, and long-acting 750 mg tablets. You can take regular, short-acting metronidazole tablets or capsules with food or on an empty stomach. However, the long-acting metronidazole tablets must be taken on an empty stomach, at least one hour before or two hours after a meal.
When treating an amebic liver abscess, the recommended dose is metronidazole 500 mg or 250 mg three times daily for 5 to 10 days.
For the medication to work properly, it must be taken as prescribed. Do not miss doses or stop taking this antibiotic earlier than your healthcare provider recommends, as bacterial resistance may develop.
Food and Drug Administration, Center for Drug Evaluation and Research. Electronic orange book: approved drug products with therapeutic equivalence evaluations. FDA Web site. Available at: http://www.fda.gov/cder/ob/. Accessed April 13, 2009.
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