Threw Up After Pills? Where the 15/30/60-Minute Rule Comes From

The 15-, 30- and 60-minute cutoffs you see online are habits, not measurements. A 2025 review that searched for studies on children vomiting after oral medicine found only two, both surveys of hospital staff. In one, a 2012 survey at a Canadian children's hospital, the authors wrote that a time-based rule "may not always be appropriate."

Call your pharmacist or doctor before you take another dose.

Why Vomiting After Taking a Pill Is So Confusing

Even hospitals often have no written answer. In the same 2012 study, only 16 of 53 health professionals at other institutions (30%) said their pediatric hospital or ward had a guideline on re-dosing after vomiting. For children, the 2025 review puts it plainly: "There are no guidelines or recommendations from competent authorities or professional associations to support decisions."

Where the 15/30/60-Minute Rule Comes From

• The 15-minute mark is pharmacist advice. Pharmacist's Letter, a pharmacist newsletter, tells pharmacists to "generally suggest redosing if vomiting occurs within about 15 minutes of the dose...or if the intact drug is in the vomitus," especially when the label says nothing about vomiting. The 2012 study notes that an earlier Canadian version of this advice was based on expert opinion.
• Thirty minutes was the most common cutoff in that 2012 survey: 60% of 65 staff would re-dose a child who vomited within 30 minutes, and 32% used 15 minutes. It asked staff what they do; it did not measure absorption.
• The 60-minute line appears in a 2025 guide for doctors at a Swedish children's hospital, which uses 15-, 30- and 60-minute cutoffs "despite limited evidence." If a child vomits more than 60 minutes after a dose with no pieces visible, it says "it is likely that the medicine has passed through the stomach, reducing the risk that vomiting affected the absorption of the medication."

Key visual check: A whole pill or capsule in the vomit is what the 2025 guide calls "the only way to be completely certain" that nothing was absorbed; pieces of a tablet or a liquid medicine are less certain. Even with a whole pill in sight, call first if you take a blood thinner, seizure medicine, stimulant or another high-risk drug.

Medicines That Set Their Own Vomiting Rule

Some labels and guidelines do give a vomiting window, and they do not agree with each other or with 15/30/60:

If your medicine is not listed, check its leaflet, then ask your pharmacist. Our guide to a missed dose of Biktarvy shows how a 1-hour vomiting rule sits alongside a separate 18-hour rule for forgotten doses.

How Your Body Absorbs a Pill

Most drugs are absorbed in the small intestine rather than the stomach, so how fast your stomach empties "is often the rate-limiting step," according to the Merck Manual. That speed varies: the 2025 guide lists age, illness, food and body position among the factors, and notes that "nausea or critical illness may reduce gastric emptying." How fast a pill breaks apart varies too, as our guide on how long a pill takes to dissolve explains.

Extended-release pills are a special case. They release their drug slowly, "usually for a period of 12 hours or more," says the Merck Manual, and the 2025 guide notes they "may reach their maximum concentration several hours after a given dose." Call your pharmacist instead of re-taking one on your own.

Sublingual and buccal tablets work differently. The Merck Manual says these are placed under the tongue or between the gums and teeth, where they dissolve and are absorbed "directly into the small blood vessels that lie beneath the tongue"; "these drugs are not swallowed." Orally disintegrating tablets (ODTs) are different: the ondansetron ODT label, for example, says to let the tablet dissolve on the tongue, "then swallow with saliva." If you vomit after an ODT, ask your pharmacist.

What to Do Based on Your Medication Type

Start with your medicine's own label or leaflet. If it says nothing about vomiting, these groups need extra care.

Birth Control Pills

Official advice differs by country and by pill type, so check which kind you take.

• For combined pills (estrogen and progestin), CDC's 2024 US guidance says that if you vomit within 24 hours of a pill, taking another one is unnecessary; keep taking your pills at the usual time. The UK's NHS says to take another pill straight away if you vomit less than 3 hours after one (4 hours for Qlaira or Zoely), and if you are still being sick, to use condoms until you have taken the pill for 7 days without being sick. Some US labels, such as Yaz, say vomiting within 3 to 4 hours "can be regarded as a missed tablet," and Yaz's patient leaflet says to use another birth control method, like condoms and a spermicide, until you check with your healthcare provider.
• For progestin-only (mini) pills, CDC says to take another pill as soon as possible if you vomit within 3 hours, then use condoms or avoid sex until 2 days after the vomiting stops (for norethindrone or norgestrel pills). For drospirenone pills, if vomiting lasts more than 24 hours, it says to do this for 7 days after it stops.
• For morning-after pills, see the Plan B One-Step, ella and CDC rows in the table above, and call right away.

If vomiting on combined pills lasts 48 hours or more, CDC says to keep taking them and to use condoms or avoid sex until you have taken hormonal pills for 7 days in a row after the vomiting stops. If this happens in the last week of active pills, it says to finish them and start a new pack the next day, skipping the hormone-free break. It says emergency contraception (other than ella) should be considered if the vomiting was in the first week of a new pack and you had unprotected sex in the previous 5 days, and after unprotected sex on mini pills. Your pill's leaflet or your pharmacist can tell you which rule to follow. For more, see our guide on what to do if you miss a dose of birth control.

Seizure Medications

Both mistakes carry risk here. MyEpilepsyTeam notes that too much anti-seizure medicine "can lead to potentially dangerous side effects," while a missed dose can lead to a seizure, though that risk "is usually low if you only missed one dose." Its advice: "contact your neurologist right away."

If you take lamotrigine, see our guide on what to do after a missed dose of lamotrigine.

Blood Thinners (Warfarin, Eliquis, Xarelto)

Do not re-dose a blood thinner on your own unless its label tells you to. The Eliquis label, for example, warns that it "can cause serious, potentially fatal, bleeding" and says that after a missed dose, "the dose should not be doubled." For children, the same label says to repeat the dose if the child vomits or spits up within 30 minutes, but not after that. Otherwise, call your doctor or pharmacist before taking another dose.

For medication-specific guidance, see our articles on missed dose of Eliquis and missed dose of warfarin.

Antibiotics

With antibiotics, the balance can tip the other way. The 2025 Swedish guide notes that for a child, "an additional dose of an antibiotic might be less hazardous than not receiving a full dose, especially when treating an acute infection." That is still a doctor's call, so ask your pharmacist before re-dosing.

If you keep throwing up your antibiotic, see our antibiotic missed-dose guide. For a child, see what to do when a child throws up their medicine.

Diabetes Medications

Nausea and vomiting are among the most common side effects on the metformin label, which also says metformin "may increase the risk of hypoglycemia" (low blood sugar) when combined with insulin or drugs like sulfonylureas. Its patient information also says to stop taking metformin and call your healthcare provider right away if you have symptoms of lactic acidosis, which include "unexplained stomach or intestinal problems with nausea and vomiting, or diarrhea." Contact your provider before taking another dose.

If metformin-related nausea keeps coming back, our guide on the best time to take metformin covers how to time it around meals.

Blood Pressure Medications

Do not re-dose a blood pressure medicine on your own. Ask your pharmacist whether to take another dose now or wait for the next one. If you already took an extra one, our guide on a double dose of blood pressure medication covers what to watch for. Our article on what happens if you stop taking blood pressure medication explains why steady dosing matters for these drugs.

Stimulants (Vyvanse, Adderall, Ritalin)

The Vyvanse label calls it a federally controlled substance (CII) and says stimulant medicines "cause an increase in blood pressure" and heart rate. It is hard to tell at home how much of a dose you absorbed, so call your prescriber or pharmacist before taking anything else. Its Medication Guide also warns that serotonin syndrome can happen when Vyvanse is taken with certain other medicines: stop taking it and call your provider or go to the nearest emergency room right away if signs such as vomiting, agitation, a fast heartbeat or high body temperature appear. For day-to-day timing, our guide on the ADHD medication schedule can help you stay consistent.

Acetaminophen (Tylenol)

The Tylenol Extra Strength label warns that "severe liver damage may occur" if you take more than 4,000 mg of acetaminophen in 24 hours, and says not to use it with any other drug containing acetaminophen. You cannot tell how much of a vomited dose stayed down, so call your pharmacist, or Poison Control at 1-800-222-1222, before taking more, especially if you also take cold, flu or combination products that contain acetaminophen.

If you re-dosed and then realized the first dose stayed down, that is a double dose, not a lost dose. Our double-dose risk guide by drug type covers what to do next.

When to Call Your Doctor or Pharmacist

MedlinePlus says that if you are vomiting after taking any of your medicines, you should tell your provider or nurse. It lists these reasons to contact your provider:

• You cannot keep any food or liquid down
• You vomit three or more times in one day
• You have nausea for more than 48 hours
• You feel weak, or you have a fever or stomach pain
• You have not urinated for 8 hours or more

Also call if you vomited a seizure medicine, blood thinner, heart medicine or stimulant, if you use insulin, or if you are unsure whether to re-dose. If you think you took too much, call Poison Control at 1-800-222-1222, the number MedlinePlus gives for suspected poisoning.

How to Prevent Vomiting After Taking Medication

If this keeps happening, these steps can help:

1. Take it with food if the label allows. Some labels build this in: the metformin label doses it with meals. If yours says "empty stomach," ask your pharmacist first, and see our guides on taking medication with food instead of an empty stomach and which medications should be taken with food.
2. Stay upright afterward. For people with nausea, MedlinePlus advises: "Sit up after you eat. Do not lie down." For pills, Poison Control advises 4 to 8 ounces of water and staying upright for at least 10 minutes, and StatPearls advises taking medicines at least 30 minutes before bedtime, both to protect your esophagus. Our guide on lying down after taking medication has the longer waits some pills need.
3. Ask your pharmacist about extended-release options. For some drugs, the slower version is easier on the stomach. A 2003 review found less nausea with controlled-release bupropion, paroxetine and venlafaxine than with their immediate-release forms, though not with fluoxetine.
4. Talk to your doctor about anti-nausea medicine. For children who still feel sick despite good technique, the 2025 guide says "the use of an antiemetic to prevent vomiting should be considered," and that it may eventually be necessary to "change the dosage form, the route of administration, or the substance."
5. Track which medications cause problems. Knowing when you took each dose and which ones made you sick helps your doctor. Pillo keeps a history of the doses you confirm, so you can spot a pattern and bring it to your next appointment.

Frequently Asked Questions

I threw up 5 minutes after taking my pill. Should I take another?

Check the label first. If it says nothing, 5 minutes falls inside the window where Pharmacist's Letter tells pharmacists to generally suggest a re-dose (within about 15 minutes, or when the intact pill is in the vomit). Call your pharmacist to confirm, and never re-dose a blood thinner, seizure medicine, stimulant or acetaminophen without asking.

What if I throw up 20 to 45 minutes after taking medicine?

This is where the habits split. In the 2012 survey, 60% of staff used 30 minutes as their cutoff and 32% used 15, and the 2025 guide uses 15, 30 and 60 minutes "despite limited evidence." Unless your medicine's label gives a window that covers this time, as Malarone's does, call your pharmacist before taking more.

Should I take another pill if I threw up 30 minutes after taking it?

It depends on the medicine. Under Malarone's 1-hour rule, 30 minutes counts; Ibrance's label says not to take another dose that day; birth control guidance differs (see above). For anything else, call your pharmacist: 30 minutes is a common hospital habit, not a measurement.

If you throw up after taking Vyvanse, does it still work?

Possibly, but you cannot tell at home how much you absorbed. Its label says stimulants raise blood pressure and heart rate, so do not take a second capsule on your own. Call your prescriber or pharmacist if you think you lost the dose.

Can I take more Tylenol if I threw it up?

Not automatically. The Tylenol label warns that severe liver damage may occur above 4,000 mg of acetaminophen in 24 hours, and you cannot tell how much of a vomited dose stayed down. Call your pharmacist or Poison Control at 1-800-222-1222 before taking more, especially if you also take cold or flu products that contain acetaminophen.

Can vomiting make birth control less effective?

It can, in theory. CDC says the effectiveness of combined pills "might be decreased because of vomiting or severe diarrhea." What to do next depends on the guidance and the pill: see the birth control section above, our birth control missed-dose guide, or ask your pharmacist.

How do I know if my medication was absorbed before I threw up?

You cannot measure it at home. The one sure sign is the whole pill in the vomit, which the 2025 guide calls "the only way to be completely certain" nothing was absorbed. After 60 minutes with no pieces visible, it suggests the medicine has likely passed through the stomach, which is a working rule, not a measurement. If you are not sure whether you got your dose, call your pharmacist.

Sources

1. PubMed Central. Kendrick JG et al. Vomiting of oral medications by pediatric patients: survey of medication redosing practices. Can J Hosp Pharm, 2012
2. PubMed Central. Garnemark CA et al. If a child vomits after an oral medication: should we re-dose or not? Acta Paediatrica, 2025
3. Pharmacist's Letter. Answer questions about redosing meds after vomiting, November 2024
4. CDC (PubMed Central). U.S. Selected Practice Recommendations for Contraceptive Use, 2024
5. NHS. What to do if you're sick or have diarrhoea when taking the combined pill
6. DailyMed. Malarone (atovaquone and proguanil) label
7. European Medicines Agency. Biktarvy product information
8. DailyMed. Plan B One-Step (levonorgestrel) label
9. DailyMed. ella (ulipristal acetate) label
10. DailyMed. Yaz (drospirenone and ethinyl estradiol) label
11. DailyMed. Ibrance (palbociclib) tablets label
12. DailyMed. Eliquis (apixaban) label
13. DailyMed. Vyvanse (lisdexamfetamine) label
14. DailyMed. Tylenol Extra Strength (acetaminophen) label
15. DailyMed. Metformin hydrochloride tablets label
16. DailyMed. Ondansetron orally disintegrating tablets label
17. Merck Manual Professional. Drug absorption
18. Merck Manual Consumer. Drug absorption
19. Merck Manual Consumer. Drug administration
20. MedlinePlus. When you have nausea and vomiting
21. MedlinePlus. Poisoning
22. Poison Control. What is pill esophagitis?
23. StatPearls. Pill-induced esophagitis
24. MyEpilepsyTeam. What should you do if you vomit your seizure medication?
25. PubMed. DeVane CL. Immediate-release versus controlled-release formulations: pharmacokinetics of newer antidepressants in relation to nausea. J Clin Psychiatry, 2003

If remembering doses is the hard part, a pill reminder app that keeps alarming until you respond can take that job off your plate.

This article is for informational purposes only and does not constitute medical advice. Consult your doctor or pharmacist for advice specific to your medications.

Reviewed under our Medical Review Policy.