Doxycycline for Cats

Doxycycline is a prescription antibiotic vets use for some feline infections. You need a vet prescription to buy it.

Updated Oct 20, 2026. Edited by: Ilyass Ben Hakim.

Where to buy

Your vet clinic can usually dispense it directly. You can also ask for a written prescription. Then a licensed pet pharmacy or compounding pharmacy can fill it.

Professional insight

Veterinary pharmacists care most about the form for cats. Many vets prefer a flavored compounded liquid over plain tablets.

Dry tablets can lodge in a cat's esophagus.
Hyclate and monohydrate salts differ in acidity.
It does not treat viral cat flu.
Compounded liquids carry a short beyond-use date.

Check the label

Your cat's name and your vet's name are on the label.
Drug name reads doxycycline, with hyclate or monohydrate noted.
Strength matches the prescription, in mg or mg/mL.
Form is the one your vet chose: liquid, tablet or capsule.
Beyond-use or expiry date is printed.
Storage line says fridge or room temperature.
Pharmacy name and phone number are shown.

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Doxycycline for cats at a glance

Drug class: Tetracycline antibiotic
Status: Prescription only; Use in cats is off-label in the US.
Known risk: Esophagitis and stricture; Reported mainly with dry tablets.

Types

Forms a vet may prescribe
Form	Where it comes from	Ask about
Compounded flavored liquid	Compounding pharmacy	Fridge needs and beyond-use date
Tablet	Vet clinic or pet pharmacy	How to help it reach the stomach
Capsule	Vet clinic or pet pharmacy	Whether it can be opened
Injection	Given in the clinic	Not something you buy at home

Questions for the seller

Is this a licensed pharmacy that verifies the prescription with my vet?
Can you compound a flavored liquid my cat will accept?
How should the liquid be stored after opening?
When does this compounded batch expire?
Do you ship cold packs if it needs refrigeration?

Safe use

Give it exactly as your vet directs.
Ask your vet how to stop pills sticking in the throat.
Finish the course unless your vet says stop.
Report regurgitation, drooling or trouble swallowing right away.
Tell your vet about pregnancy or liver disease.

Red flags

Seller offers doxycycline with no prescription.
Product is labeled for fish or aquarium use.
Pharmacy has no license details or US address.
Pills arrive loose without a pharmacy label.

Common questions

Can I buy doxycycline for my cat without a vet?: No. It is a prescription drug. A vet must examine your cat and prescribe it.
Why do vets prefer liquid doxycycline for cats?: Tablets can stick in a cat's esophagus and cause damage. Liquids pass more easily.
Will doxycycline cure my cat's cold?: Only if bacteria are involved. Most cat colds are viral. Your vet decides.