Mirataz Dosage for a 12 lb Cat

Mirataz (mirtazapine transdermal ointment) is FDA-approved for cats at approximately 1.5 inches of ointment applied to the inner ear pinna once daily for up to 14 days. Oral mirtazapine is sometimes used at very low per-cat doses (1.88-3.75 mg per cat, NOT per kg) every 24-72 hours, calculated by a vet. For a 12 lb (5.4 kg) cat, this gives a range that a licensed vet will narrow down based on the indication, your cat's age, kidney/liver function, and any other medications. RexVet vets serve Florida, New York, and Virginia and can calculate the right dose for your specific cat in a $64.99 video visit.

Mirataz (mirtazapine) is widely used in cats in the 12 lb range, but "safe" depends on the specific cat, not just the weight. 12 lb is the upper bound of typical healthy cat weight for many breeds. Above 12 lb, vets begin considering whether the cat is genuinely large or carrying extra body weight that affects drug distribution. A licensed vet will check your cat's history, current medications, and any underlying conditions before prescribing.

The most common things to watch for are: Increased vocalization or pacing (relatively common, often resolves); Severe agitation or aggression — call vet immediately, dose may be too high; Tremors or twitching (sign of serotonin syndrome — emergency). If you see anything concerning, contact a vet. For medium adult cats specifically: 12 lb is the upper bound of typical healthy cat weight for many breeds.

If the veterinarian decides medication is appropriate, they can prescribe where state rules allow; some medications need an in-person exam first.

RexVet’s veterinarians are licensed in all three states and take refill requests where state rules allow for cats already established on the medication. Refill visits are also $64.99. Prescriptions are filled through RexVet's in-house pharmacy (RexVetRx) or can be sent to your local pharmacy. When the veterinarian prescribes, same-day delivery is available in most ZIP codes in FL, NY, and VA.