Name: Can You Drink Alcohol After Taking Plan B? What You Should Know
Published: 2026-08-13T16:28:32+05:30
Keywords: Can You Drink Alcohol After Taking Plan B

Medically reviewed by: Dr Nivedita Pandey

U.S.-Trained Gastroenterologist and Hepatologist

You can drink alcohol after taking Plan B. Alcohol does not stop levonorgestrel, the active hormone in Plan B, from doing its job. No published clinical study shows that alcohol after Plan B lowers how well it prevents pregnancy. The real problem with drinking after Plan B is what alcohol can do to your judgment, your stomach, and your follow-up care in the days after.

Table of Contents

Plan B is the most used emergency contraceptive pill in the United States. It works best within 24 hours of unprotected sex, though the FDA label allows use up to 72 hours. This guide covers what happens when you drink after taking it, the real risks involved, what vomiting means for your dose, and what to watch for in the days that follow.

Can You Drink Alcohol After Taking Plan B?

Question	Answer
Can you drink after Plan B?	Yes
Does alcohol cancel Plan B?	No
Does alcohol reduce effectiveness?	No direct evidence
Can vomiting be a problem?	Yes
Should you avoid heavy drinking?	Usually recommended

So you cannot drink alcohol after taking Plan B without any risk at all. A glass of wine will not undo your dose. But heavy drinking raises your odds of throwing up, forgetting a follow-up step, or having unprotected sex again while your judgment is impaired. Those are the outcomes that actually put you at risk, not the alcohol itself.

Does Alcohol Affect How Plan B Works?

Levonorgestrel is broken down mainly through your liver’s normal hormone pathways. Alcohol is processed through a different set of liver enzymes. The two do not compete for the same route in a way that would cancel your dose.

Is It Safe to Drink After Taking Plan B?

Light to moderate drinking is generally considered safe after taking Plan B. Your body has already started absorbing the hormone within the first hour or two. Once absorption is complete, alcohol has no known way to reverse or block that process.

When Should You Avoid Alcohol?

Skip alcohol if you already feel nauseous, dizzy, or shaky from the medication itself. Drinking on top of those side effects makes them worse and raises your chance of vomiting before the dose is fully absorbed.

How Plan B Works and Why Alcohol Doesn’t Directly Interfere

Plan B contains levonorgestrel, a synthetic hormone also used in regular birth control pills. It works mainly by delaying or stopping ovulation, so no egg is released for sperm to fertilize. It does not end an existing pregnancy.

Alcohol does not block hormone receptors, and it does not neutralize levonorgestrel once it reaches your bloodstream. Plan B effectiveness and alcohol have been studied indirectly through drug interaction data, and no interaction has been flagged in FDA labeling. The label does list a few drugs that reduce effectiveness, such as certain seizure medications and the antibiotic rifampin. Alcohol is not on that list.

The Real Risks of Drinking Around the Time You Take Plan B

The danger with drinking after Plan B is behavioral, not chemical. Three things matter most.

Vomiting Before the Medication Is Absorbed

Heavy drinking increases nausea and vomiting on its own. If you throw up within two hours of taking Plan B, you may lose part of the dose before your body absorbs it. This is the single biggest reason doctors ask patients to be careful with alcohol after Plan B.

Increased Dizziness or Fatigue

Plan B can already cause dizziness, headache, and tiredness. Alcohol adds to all three. Combining them can leave you unsteady, especially if you plan to drive or go out after taking the pill.

More Unprotected Sex Afterward

Plan B only protects against the act of unprotected sex that already happened. It does not protect you for the rest of your cycle. Drinking lowers inhibition, and a second act of unprotected sex within the same week is not covered by your first dose.

What If You Vomit After Taking Plan B?

Vomiting after taking Plan B is the one alcohol-related event that can genuinely affect your protection. Timing decides what you should do next.

Vomiting Within About 2 Hours

If you vomit within two hours of taking the pill, the FDA label states you should consider repeating the dose. Call a pharmacist or your doctor first if possible, since they can confirm whether a second dose is needed based on how much time passed.

Vomiting Several Hours Later

If you vomit more than two hours after taking Plan B, your body has likely already absorbed the full dose. Levonorgestrel reaches peak blood levels in under two hours in most people, so a repeat dose usually is not needed at that point.

What Should You Do After Taking Plan B?

Expect some combination of nausea, headache, breast tenderness, lower stomach pain, tiredness, or dizziness over the next day or two. These usually fade within 24 to 48 hours. Your next period may arrive earlier or later than normal, and flow can be lighter or heavier than usual.

Keep water and a light snack nearby if nausea hits
Rest instead of pushing through dizziness
Avoid driving if you feel lightheaded, especially if you also drank alcohol

Know When to Take a Pregnancy Test

Take a pregnancy test if your period is more than seven days late. A period that is only a few days off schedule is common and not a reason to worry on its own.

What To Do If You’re Unsure Alcohol Affected Your Plan B

You Drank But Didn’t Vomit

No action needed. Drinking after Plan B without vomiting does not change your protection.

You Vomited Soon After Taking Plan B

Call your pharmacist or doctor the same day. If it has been under two hours, ask whether you should take a second dose.

You Had Sex Again After Taking Plan B

Use a backup method like condoms right away. Plan B does not cover future acts of unprotected sex, whether or not alcohol was involved.

Your Period Is More Than One Week Late

Take a home pregnancy test. If it is positive, or if you are unsure how to read it, contact your doctor for follow-up testing.

FAQs

Can you drink alcohol after taking Plan B?

Yes. You can drink alcohol after taking Plan B and still be protected. Moderate drinking does not block levonorgestrel absorption or reduce its ability to delay ovulation.

Does alcohol make Plan B less effective?

No. Alcohol does not make Plan B less effective based on current evidence. No study or FDA label lists alcohol as a drug interaction that lowers levonorgestrel’s effectiveness.

What happens if you vomit after taking Plan B?

Vomiting within two hours may mean you lost part of the dose. Call a pharmacist to ask about repeating it. Vomiting after two hours usually needs no action.