Back to SearchPetVitals

Antihistamines (Benadryl)

Danger

Antihistamines can cause serious side effects in pets. Cats are especially sensitive.

Unsafe for Dogs
Unsafe for Cats

Symptoms to Watch For

Drowsiness, lethargy, vomiting, rapid heart rate, agitation

What to Do

Contact vet. Never medicate without professional guidance.

Worried about emergency vet bills?

Pet insurance can cover toxin ingestion emergencies. Plans start at $10/month.

Compare plans We may earn a commission
Tags:medicationantihistaminesedativedanger

Clinical References

  • https://www.fda.gov/animal-veterinary
  • https://www.petpoisonhelpline.com/poisons/

Related Items

Ibuprofen (Advil, Motrin)Danger

Ibuprofen is highly toxic to pets. Even one pill can cause serious kidney damage or stomach ulcers.

Acetaminophen (Tylenol)Danger

Extremely toxic to cats (one tablet can be fatal). Causes liver damage and red blood cell damage.

AspirinDanger

Stomach ulcers and kidney damage. Cats especially sensitive.

Antidepressants (SSRIs)Danger

Can cause serotonin syndrome. Even one pill is serious.

Vitamin D SupplementsDanger

Overdose causes dangerous calcium levels. Kidney failure.

Iron SupplementsDanger

Iron toxicity causing liver damage and metabolic acidosis.

Search all 500+ items
Disclaimer: This information is for educational purposes only and is not a substitute for professional veterinary advice. If you suspect your pet has ingested something toxic, contact your veterinarian or the ASPCA Animal Poison Control Center (888-426-4435) immediately.
© 2026 PetVitals. Always consult your veterinarian.