Last updated: June 2026
Get weight-based dosage estimates for common over-the-counter medications.
Based on veterinary guidelines — always confirm with your vet before giving any medication.
⚠️ This tool provides ESTIMATES ONLY based on published veterinary references. It is NOT a substitute for veterinary advice. Always consult your vet before giving any medication to your pet. Never give medications to cats without explicit vet guidance — many human medications are toxic to cats.
Several common human over-the-counter (OTC) medications can be safely used for dogs and cats at the correct weight-based dosage. However, dosing for pets is very different from human dosing — even a small overdose can cause serious harm. Our calculator above provides safe dosages based on your pet's weight, but always confirm with your veterinarian before administering any medication.
The most commonly used OTC medications for pets include:
Many common human medications are extremely dangerous — even fatal — to dogs and cats. Never give your pet:
If your pet accidentally ingests any human medication, call your vet or the Pet Poison Helpline (855-764-7661) immediately. Emergency treatment can cost $300–$1,500 — see ouremergency vet visit cost guide.
OTC medications are appropriate for mild, temporary symptoms — occasional itching, mild stomach upset, or travel anxiety. But if symptoms persist beyond 48 hours, worsen, or are accompanied by lethargy, vomiting, diarrhea, or loss of appetite, stop self-treating and see your veterinarian. Chronic conditions like allergies, arthritis, and gastrointestinal disease require prescription medications at proper veterinary doses. For ongoing medication costs, see ourpet medication cost guide.
See average pet care costs and local vet clinics in cities across the US.