My dog ate cough & cold syrups (dextromethorphan combos) — what should I do?
YELLOW — Call your vet today
What to do now
- Call your regular vet today (or a poison hotline if after hours).
- Watch closely for the symptoms below; if they appear or worsen, go to an emergency vet.
- Remove any remaining material and keep packaging/labels — the vet will want product names and amounts.
- Do not induce vomiting unless a vet or poison-control expert tells you to.
- Note the time it was eaten, roughly how much, and your dog's weight.
Why it's a problem
Many contain acetaminophen, decongestants or xylitol in addition to dextromethorphan.
Symptoms to watch for
Vomiting, agitation or sedation, racing heart.
When: 1-3 hours
⚠️ If it contains acetaminophen, a decongestant, or xylitol, treat as RED.
Frequently asked questions
Is cough & cold syrups (dextromethorphan combos) dangerous for dogs?
It can be. Many contain acetaminophen, decongestants or xylitol in addition to dextromethorphan. Call your vet today for advice.
What are the symptoms if my dog ate cough & cold syrups (dextromethorphan combos)?
Vomiting, agitation or sedation, racing heart.
How soon do symptoms appear after a dog eats cough & cold syrups (dextromethorphan combos)?
1-3 hours
Is there anything else to know about cough & cold syrups (dextromethorphan combos)?
If it contains acetaminophen, a decongestant, or xylitol, treat as RED.
What should I do if my dog ate cough & cold syrups (dextromethorphan combos)?
Call your regular vet today (or a poison hotline if after hours). Watch closely for the symptoms below; if they appear or worsen, go to an emergency vet.
Who can I call for help?
ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661, both 24/7 (fees may apply), or your nearest emergency vet.
Dose guidance
No reliable dog-specific threshold is published for home use, so any amount should be discussed with your vet or a poison hotline.
Sources
Last verified against these sources: 2026-10-13. Where sources disagree, PawPanic uses the more conservative guidance.
Also known as: robitussin, dextromethorphan, mucinex · Category: Medication · Last reviewed 2026-10-14