Allergy Drops for Cat Allergy: Treating Fel d 1 at Home
If a cat allergy is making you miserable but you don't want to give up your cat, sublingual immunotherapy is worth understanding. Cat allergy is driven mainly by the Fel d 1 protein in cat saliva and dander. Immunotherapy is the only treatment that addresses the sensitivity itself rather than just masking symptoms, and it can be delivered as daily under-the-tongue drops at home. There's no FDA-approved cat sublingual tablet, so cat immunotherapy via drops is prescribed off-label using regulated cat allergen extract — a legal, common approach for allergens without an approved tablet.
3 peer-reviewed sources
Sublingual immunotherapy can be used to build tolerance to cat allergen (Fel d 1) as daily at-home drops. There's no FDA-approved cat tablet, so it's prescribed off-label using regulated cat extract — the disease-modifying option for cat-allergic people who want to keep their cat.
Medically reviewed by Dr. Chet Tharpe, M.D. · Last reviewed August 2026
Key facts
Cat allergy is driven primarily by the Fel d 1 protein, found in cat saliva, skin, and dander — not the fur itself.
There is no FDA-approved sublingual TABLET for cat allergy; cat sublingual immunotherapy uses regulated cat allergen extract prescribed off-label.
Immunotherapy is the only treatment that modifies the underlying allergy rather than managing symptoms, and can be delivered as daily at-home sublingual doses.
Treating a cat allergy without rehoming your cat
Avoidance is the standard first advice for pet allergy, but it's impractical if you love your cat — and cat allergen is notoriously persistent, clinging to surfaces for months. That leaves two real options: manage symptoms indefinitely with medication, or treat the underlying sensitivity with immunotherapy. Immunotherapy gradually exposes the immune system to controlled doses of cat allergen (Fel d 1), shifting the response toward tolerance so exposure to your cat triggers less of a reaction over time. Sublingual immunotherapy delivers this as a daily under-the-tongue dose at home. Because no FDA-approved cat tablet exists, cat sublingual immunotherapy is compounded from regulated cat allergen extract and prescribed off-label — the same legal, routine approach used for any allergen without an approved tablet. The first step is confirming a cat allergy with testing, since not every 'cat reaction' is Fel d 1.
Immunotherapy is the disease-modifying path for cat allergy; sublingual drops make it a daily at-home option for people who want to keep their cat.
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See if at-home allergy drops fit your allergies — a 2-minute quiz, designed by board-certified allergists, taken under the tongue daily with no clinic visits.
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No needles. No clinic visits.
Curex's allergy drops are taken under the tongue at home, daily — for a flat $79/month, with no needles and no routine clinic visits.
Allergy drops are compounded at a specialty pharmacy for each patient, and the FDA does not review compounded products for safety or efficacy.
See if allergy drops are right for youFrequently asked questions
Can allergy drops help my cat allergy so I can keep my cat?
Sublingual immunotherapy can build tolerance to cat allergen (Fel d 1) over time, reducing your reaction to exposure. It's taken as daily at-home drops and is the disease-modifying option, versus antihistamines that only mask symptoms. Results are gradual and require a multi-year course.
Is there an FDA-approved cat allergy tablet?
No. FDA-approved sublingual tablets exist for grass, ragweed, and dust mite — not cat. Cat sublingual immunotherapy uses regulated cat allergen extract prescribed off-label, which is legal and common for allergens without an approved tablet.
How long until it helps?
Immunotherapy works gradually — improvement typically builds over months, and a multi-year course is recommended for lasting benefit. It's a commitment, not a quick fix.
Who should see an allergist in person first?
If your cat exposure has ever caused a severe or systemic reaction, or you have poorly controlled asthma, get an in-person evaluation before starting immunotherapy.
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Treat your allergies — drops under the tongue.
Curex allergy drops are a personalized sublingual extract, prescribed by a board-certified allergist and shipped to your door — taken daily at home with no needles and no routine clinic visits. From $79/month. HSA/FSA eligible.
From $79/mo · No needles · HSA/FSA eligible · Cancel anytime
Allergy drops are compounded at a specialty pharmacy for each patient, and the FDA does not review compounded products for safety or efficacy.
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. Content reviewed by board-certified allergists at Curex.
Allergy drops are compounded at a specialty pharmacy for each patient, and the FDA does not review compounded products for safety or efficacy.
The only FDA-approved sublingual immunotherapy products are tablets — Grastek, Oralair, Ragwitek, and Odactra — which are different from Curex drops.