I was taking #14 metronidazole 500mg for a vaginal bacterial infection. The nurse informed me on the phone that I can resume sexual activity without a condom as soon as I finish the pill. I didn't feel too reassured with her answer since regular antibiotic are 7 days after.
For many years the usual advice to women from healthcare providers was to use an added form of birth control to their pills, such as a condom, to prevent pregnancy until after the antibiotic was finished or some would extend this time for another 7 days.
The effects of antibiotics on birth control pills may be overstated.
There is one exception in the case of rifampin. Rifampin does decrease the effectiveness of birth control pills in preventing ovulation, but this antibiotic isn't widely used today.
A study in 2002 concluded that metronidazole did not reduce the effectiveness of oral contraceptives.
With this in mind I think it is safe to say that the advice you received was fine and in reality you may not have needed to use condoms at all.
Here is a link to that information.
- Metronidazole Information for Consumers
- Metronidazole Information for Healthcare Professionals (includes dosage details)
- Side Effects of Metronidazole (detailed)
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