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Naproxen (Aleve)

Pet toxin reference — educational information only.
Pet toxins

What to know

Naproxen (Aleve) — toxicity in dogs and cats

EmergencyApplies to: dogs and cats.

Overview

Naproxen is a long-acting NSAID that is extremely hazardous for pets, especially dogs. Toxic doses can cause severe stomach ulceration, gastrointestinal bleeding, and kidney injury. Because naproxen stays in the body longer than many other pain relievers, symptoms can be prolonged and serious. Any meaningful exposure should be treated as an emergency.

Symptoms

Vomiting, black stool, abdominal pain, kidney failure

Typical onset

2-12 hours

What to do

Seek emergency care immediately.

This page is educational and does not replace veterinary advice. If your pet may have been exposed, call UVEC at (801) 218-2227 or ASPCA Poison Control at (888) 426-4435.

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Naproxen is a long-acting NSAID that is extremely hazardous for pets, especially dogs. Toxic doses can cause severe stomach ulceration, gastrointestinal bleeding, and kidney injury. Because naproxen stays in the body longer than many other pain relievers, symptoms can be prolonged and serious. Any meaningful exposure should be treated as an emergency.

Symptoms
Vomiting, black stool, abdominal pain, kidney failure
Onset
2-12 hours
What to do now
Seek emergency care immediately.
Call us: (801) 218-2227
This tool is informational only and does not replace veterinary advice. If ingestion may have happened, contact us at (801) 218-2227 or ASPCA Poison Control at (888) 426-4435. Utah Veterinary Emergency Center provides same-day urgent care and is not a 24/7 emergency hospital. For life-threatening signs after hours, call (801) 218-2227 for guidance or go to the nearest 24/7 emergency hospital.