What to Do After a Reaction: Document, Contact a Professional, Keep the Product
A plain checklist for after a possible reaction to a remedy or supplement: emergency signs first, then contacting a professional, writing down what happened and reporting.
Content last updated . This page has not been medically reviewed.
Step 1: Is it an emergency?
Call 911 if the person collapses, has a seizure, has trouble breathing or cannot be woken. [1] Difficulty breathing, hives, or swelling of the face, eyes or tongue can be signs of anaphylaxis, which MedlinePlus says needs medical attention right away. [2] If something harmful may have been swallowed, call Poison Help at 1-800-222-1222 and do not induce vomiting. [1]
Step 2: Contact a professional
For a side effect that is not an emergency, NCCIH advises stopping the supplement and contacting your health care provider; you may also contact the manufacturer. [3] In Europe, EMA also advises seeking advice from a doctor or pharmacist. [4]
This applies to the supplement. If the product is a prescribed medicine, or you take prescribed medicines, do not stop or change them yourself: ask the prescriber or pharmacist.
Step 3: Write down what happened
The sources we read do not give a standard list, so these are common-sense notes rather than official requirements: the product name and type, when you started, when symptoms began and what they were, your other medicines and supplements, and whether anything changed after stopping. This helps the clinician and any report. Our printable list can help you keep this together.
Step 4: Tell your care team about every product
NCCIH advises telling your health care providers about all the dietary supplements you take. [3] See Talking with a health professional.
Step 5: Watch for liver signs
MedlinePlus lists changes in the color of stool and urine and jaundice among symptoms of liver disease. [5] Mention these to your clinician. See Liver safety.
Step 6: Consider reporting
FDA says to contact your health care professional first and then report the problem. [6] See US reporting steps or other countries.
About the leftover product
The sources we read did not say what to do with the leftover product. Ask the clinician, pharmacist or reporting agency before throwing it away.
Frequently asked questions
What should I do first after a reaction?
Check for emergency signs: collapse, seizure, trouble breathing or inability to wake. If present, call 911. [1]
Should I stop the supplement?
NCCIH advises stopping the supplement and contacting your provider. [3] Do not stop prescribed medicines without asking the prescriber or pharmacist.
Should I tell the doctor about natural products?
Yes. NCCIH advises telling your providers about all dietary supplements you take. [3]
Is it worth reporting a mild reaction?
FDA says reports are recorded and, added together, can signal a safety problem. [6] Contact your clinician first.
What if I think I swallowed too much?
Call Poison Help at 1-800-222-1222 and do not induce vomiting. [1] See Poisoning: what to do first.
References
- Poison Control (America's Poison Centers). First aid: Act fast!. Read 2026-10-23.
- MedlinePlus (National Library of Medicine). Anaphylaxis. Read 2026-10-23.
- NCCIH (National Institutes of Health, United States). Using Dietary Supplements Wisely. Read 2026-10-23.
- European Medicines Agency. Frequently asked questions: reporting suspected side effects. Read 2026-10-23.
- MedlinePlus (National Library of Medicine). Liver diseases. Read 2026-10-23.
- U.S. Food and Drug Administration. FDA 101: How to Use the Consumer Complaint System and MedWatch. Consumer update. Read 2026-10-23.