Hi Ronnie, I found the FDA dosing information here at drugs.com. You have enough for the 1 day regimen (2000mg) and the wrong size for the 7 day regimen; 3 day treatments are not listed:
"Metronidazole Dosage and Administration
In the Female ("In the Male, treatment should be individualized as it is for the female.")
One-day treatment − two grams of Metronidazole tablets, given either as a single dose or in two divided doses of one gram each, given in the same day.
Seven-day course of treatment − 250 mg three times daily for seven consecutive days. There is some indication from controlled comparative studies that cure rates as determined by vaginal smears and signs and symptoms, may be higher after a seven-day course of treatment than after a one-day treatment regimen.
The dosage regimen should be individualized. Single-dose treatment can assure compliance, especially if administered under supervision, in those patients who cannot be relied on to continue the seven-day regimen. A seven-day course of treatment may minimize reinfection by protecting the patient long enough for the sexual contacts to obtain appropriate treatment. Further, some patients may tolerate one treatment regimen better than the other."
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