How often can you take Plan B?
Last updated September 3, 2026.
You can take Plan B more than once, and there is no known medical danger or lifetime cap, but it is a poor substitute for regular birth control. Each dose protects only against sex that already happened, and its 75 to 89% effectiveness within 3 days compounds into real pregnancy risk when used repeatedly. The other cost is your cycle: frequent use commonly makes periods irregular and unpredictable, and the label is direct that it is not for regular birth control. Two rules matter for repeat use. Never combine ella and Plan B within 5 days of each other, because they can reduce each other's effectiveness; if you need EC again within that window, use levonorgestrel again. And use backup contraception after any EC dose, since it covers nothing going forward. If you find yourself buying Plan B more than once or twice a year, treat that as the cue to pick a regular method; nearly all of them are more effective and most cost less than repeated EC.
What to do
- No lifetime cap: repeat use is safe, just not a good strategy.
- Never mix ella and Plan B within 5 days: use levonorgestrel again for the repeat.
- Backup after every dose: EC covers the past, not the future.
- Expect irregular periods: frequent use commonly scrambles cycle timing.
- One or two a year is the line: past that, a regular method wins on effectiveness and cost.
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