I want to know if plan B always does it's effect ( delay ovulation or prevent sperm to get to the egg) even if it happens to fail?
No. It can't delay ovulation, if you've already ovulated, for example.
The Manufacturer does not guarantee it to always be 100% effective. It's around 95% effective when taken within the first 12 hours, & that lessens as the 72 hours goes on, until it's only around 75% effective, if taken 3 day after unprotected sex.
- Plan B Information for Consumers
- Plan B Information for Healthcare Professionals (includes dosage details)
- Side Effects of Plan B (detailed)
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