Is Cold & Allergy Medications Toxic to Cats and Dogs?
Cold and allergy meds with pseudoephedrine are severely toxic to cats and dogs — they act as stimulants and can cause seizures. Call a vet.
Potentially life-threatening — treat any exposure as an emergency.
Potentially life-threatening — treat any exposure as an emergency.
In an emergency, do not wait.
Medical disclaimer: This tool is for general information only and isnot a substitute for veterinary diagnosis or treatment. Toxicity depends on the amount, your pet’s size, and health history. If your pet may have ingested something harmful, contact your veterinarian or a poison control hotline ((888) 426-4435 / (855) 764-7661) immediately — do not wait for symptoms to appear.
What is Cold & Allergy Medications?
Cold and allergy meds with pseudoephedrine are severely toxic to cats and dogs — they act as stimulants and can cause seizures. Call a vet.
Also known as: pseudoephedrine, sudafed, phenylephrine, nyquil, dayquil, decongestant, cold medicine, sinus medicine.
Symptoms to Watch For
🐕 In Dogs
- Agitation, restlessness, and panting
- Rapid or irregular heart rate and high blood pressure
- Dilated pupils and tremors
- Seizures, hyperthermia, and collapse
🐈 In Cats
- Agitation and restlessness
- Rapid heart rate and dilated pupils
- Tremors and hyperthermia
- Seizures and collapse
What to Do If Ingested
- Call a veterinarian or poison hotline immediately.
- Note the active ingredients (pseudoephedrine, phenylephrine, and whether acetaminophen is also present), mg strength, and number of pills, plus the time.
- Do not induce vomiting unless a vet directs it.
Steps apply to both cats and dogs. When in doubt, call a vet or poison hotline before acting.
When to Call the Vet Immediately
Call your veterinarian or a poison control hotline right away if you notice any of these:
- Any cold or decongestant medicine was eaten
- Agitation, panting, or a racing heart
- Tremors or dilated pupils
- Seizures or collapse
Frequently Asked Questions
Frequently Asked Questions
What makes cold and sinus medicines dangerous to pets?
Decongestants like pseudoephedrine and phenylephrine are stimulants that act like amphetamines in pets, causing agitation, a racing heart, high blood pressure, tremors, seizures, and a dangerous rise in body temperature. They are among the more dangerous human meds — call a vet immediately.
Do cold medicines contain other toxins too?
Often, yes. Many cold and flu products combine a decongestant with acetaminophen or antihistamines, each of which is separately toxic. When you call a vet, read the full ingredients and strength from the label so they can assess every active ingredient.
How much Sudafed is dangerous to a dog?
Even one or two regular-strength pseudoephedrine pills can cause serious toxicity in a small to medium dog. The risk depends on the dose per pound of body weight, so call a vet or poison hotline right away with the milligram strength and number of pills eaten.
Sources
This entry is reviewed against the following authoritative veterinary sources.
Last reviewed: 2026-07-11