Few things rattle a parent like watching a hard-won dose of medicine come right back up. The instinct is to immediately give more. Sometimes that is right, and sometimes it is not. Here is how to decide. This is general guidance, so call your pediatrician or pharmacist for advice specific to your child and their medicine.
The 15 and 60-Minute Rule for Kids
Clinicians decide whether to re-dose based mostly on how much time passed between the dose and the vomiting. A 2025 pediatric review by Garnemark and colleagues notes that the medication is generally re-given if it is visible in the vomit or if the child throws up within about 15 minutes of taking it. A 2012 survey of hospital practitioners found 60% use a 30-minute rule and 32% use a 15-minute cutoff, and that most rely on judgment rather than a fixed rule.
Here is the general framework parents and pharmacists use:
| Time since the dose | What likely happened | General approach |
|---|---|---|
| Under 15 minutes (or you can see it in the vomit) | Little was absorbed | Usually re-dose, but check the medicine type below first |
| 15 to 60 minutes | Hard to know how much absorbed | Do not re-dose on your own. Wait until calm and call your pharmacist |
| More than 60 minutes | Likely absorbed | Do not give more. Resume the normal schedule |
One important exception runs through all of it: some medicines should not be re-dosed on a parent's judgment alone. Fever medicines and a few others have their own rules, covered next.
Wait Until Your Child Is Calm Before Re-Dosing
If you do need to give the dose again, do not do it the second the vomiting stops. A child who is still queasy will often bring the second dose right back up too.
Give their stomach a short break, usually 15 to 30 minutes, until they are calm and settled. Then offer the dose with a small sip of water or a familiar drink. Going slowly here saves you from a frustrating repeat.
Fever Medicines (Acetaminophen and Ibuprofen) Need Extra Care
This is where the simple timing rule does not apply. With children's fever medicines like acetaminophen (Tylenol) and ibuprofen (Motrin), an accidental extra dose can be harmful, so do not automatically re-give them after vomiting.
If your child throws up a fever medicine, do not guess. Call your pharmacist or Poison Control at 1-800-222-1222, which is free and available 24 hours a day. They can tell you whether and when it is safe to give more based on how much time passed. This matters because, as the CDC notes, in children, side effects from medicines are a leading reason for medication-related emergency visits, and giving extra is a common home error the American Academy of Pediatrics warns about.
Antibiotics: Usually Safer to Re-Dose if It Was Quick
Antibiotics are more forgiving than fever medicines. Most are considered reasonable to re-dose if your child threw up within about 15 to 30 minutes, since missing part of a dose matters more than a small overlap. Amoxicillin, the most common children's antibiotic, clears quickly, so steady dosing helps the treatment work.
Still, confirm with your pharmacist, especially if it keeps happening. For the full picture, see our guides on a missed antibiotic dose for a child and a missed dose of amoxicillin. For the adult and general version of these timing rules, our guide on what to do when you vomit after taking medication goes deeper by drug class.
When to Call the Pediatrician or Poison Control
Some situations are not a "decide at home" moment. Call your pediatrician, or Poison Control at 1-800-222-1222, if:
- Your child threw up a fever medicine, seizure medicine, or heart medicine, and you are unsure about re-dosing.
- Your child cannot keep any medicine or fluids down after several tries.
- Your child is vomiting repeatedly, seems dehydrated, or is getting worse.
- You are not sure how much medicine actually stayed down.
- Your child accidentally got an extra dose.
How Pillo Helps Parents Keep Track
When a child is sick, doses get chaotic fast, and it is easy to lose track of what was given and when. With Pillo, you can manage your child as a dependent in your own app and log each dose, including a dose that came back up, so you can see exactly what happened instead of guessing. Persistent alarms keep reminding you until you respond, which helps on a busy sick day. If you are juggling a three-times-a-day schedule or just cannot remember whether a dose was given, a clear log takes the pressure off.
Frequently Asked Questions
My child threw up 30 minutes after taking medicine. Should I give another dose?
At 30 minutes, it is hard to know how much was absorbed, so do not automatically re-dose. For most medicines, wait and watch rather than giving more. For fever medicines specifically, do not give extra. Call your pharmacist or Poison Control at 1-800-222-1222, who can advise based on the exact medicine and timing.
My child threw up 15 minutes after taking medicine. What should I do?
Within about 15 minutes, little of the medicine was likely absorbed, especially if you can see it in the vomit. For most antibiotics it is reasonable to re-dose once your child is calm. For fever medicines, do not re-dose on your own. Call your pharmacist or Poison Control first.
My child threw up their antibiotic. Do I retake or wait?
If it came up within about 15 to 30 minutes, antibiotics are generally considered reasonable to give again, because a small overlap is usually less of a problem than missing the dose. Wait until your child is calm, then give it with a little water. If more than 30 minutes passed, or it keeps happening, call your pharmacist.
Can I give my child more Tylenol or Motrin if they threw it up?
Be careful. An accidental extra dose of acetaminophen (Tylenol) or ibuprofen (Motrin) can harm a child, so do not automatically give more after vomiting. Call your pharmacist or Poison Control at 1-800-222-1222 before re-dosing a fever medicine. They will tell you whether it is safe based on the timing.
How long should I wait before giving the dose again?
If re-dosing is appropriate, wait until your child is calm and their stomach has settled, usually about 15 to 30 minutes, before trying again. Giving it too soon often leads to a second round of vomiting. Offer it with a small sip of water.
What if I can see the pill or liquid in the vomit?
Seeing the intact pill or most of the liquid is a strong sign the medicine was not absorbed. For most medicines, that makes re-dosing reasonable once your child is calm. The exceptions are fever medicines and other high-risk drugs, where you should call your pharmacist or Poison Control before giving more.
Sources
- PubMed / PMC. Garnemark et al., 2025 pediatric redosing review
- PubMed / PMC. Kendrick et al., 2012, pediatric redosing practices survey
- Poison Control. Medication errors: double dosing
- American Academy of Pediatrics (HealthyChildren.org). Ways to Prevent Children's Medication Errors at Home
- CDC. Antibiotic Use (children and side effects)
- FDA DailyMed. Amoxicillin prescribing information
This article provides general information about medication management and is not a substitute for professional medical advice. Always consult your pediatrician, pharmacist, or Poison Control before re-giving any medicine to your child after vomiting.
