What medications affect Plan B?

Some drugs or herbal products that may decrease the effectiveness of progestin-only pills include:

• barbiturates (including primidone)
• bosentan.
• carbamazepine.
• felbamate.
• griseofulvin.
• oxcarbazepine.
• phenytoin.
• rifampin.

Can I take ibuprofen after Plan B?

No interactions were found between ibuprofen and Plan B. This does not necessarily mean no interactions exist. Always consult your healthcare provider.

Can you take Plan B while ovulating?

Morning-after pills won’t work if your body has already started ovulating. This is why timing is so important, especially if you’re using Plan B and other levonorgestrel morning-after pills.

Does alcohol affect Plan B?

Official Answer. Yes. After taking the emergency contraceptive Plan B (levonorgestrel), it is considered safe to drink alcohol, and alcohol is not known to alter the efficacy of Plan B.

Can Plan B mess up your body?

Like any medication, Plan B One-Step does have side effects. The most common side effect is nausea, which occurs in about a quarter of women after taking the drug. Other side effects include abdominal pain, fatigue, headache, dizziness, vomiting, and menstrual changes.

What makes Plan B less effective?

One risk factor that can make Plan B less effective is if you have unprotected intercourse repeatedly in the same cycle. “If Plan B delays ovulation by a few days and then you have another act of unprotected sex a few days later, you can still get pregnant,” Bender says.

How do you know if Plan B didn’t work?

If you’re unsure whether Plan B has worked, take a pregnancy test. Take one straight away if you keep track of your cycle and know that your period is at least a week late. But if you’re not sure where you are in your menstrual cycle, wait 3 weeks after taking Plan B before using a pregnancy test.

What are the chances of Plan B working?

The sooner you take Plan B®, the more effective it is. It can prevent pregnancy if taken within 72 hours and preferably within 12 hours of unprotected sex. If you take it within 24 hours of unprotected sex, it is 95% effective. If you take it between 48 and 72 hours of unprotected sex, the efficacy rate is 61%.

What is the effectiveness of Plan B?

The sooner you take Plan B®, the more effective it is. It can prevent pregnancy if taken within 72 hours and preferably within 12 hours of unprotected sex. If you take it within 24 hours of unprotected sex, it is 95% effective.

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