What the label lists and what reports show
Felis catus hair side effects
Felis catus hair's FDA label lists its adverse reactions in its own words. FAERS holds 163 reports naming it through July 30, 2026; the reaction reported most often, leaving out the conditions it is used for, product-use terms and outcomes, is anaphylactic reaction (47 reports).
- No generic listed
- Boxed warning
Check it at the source: the felis catus hair FDA label on DailyMed (effective June 3, 2025); the FDA FAERS public dashboard.
What does the label list?
From the label: adverse reactionsLocal Reactions From Skin Testing Large local reactions may result from skin tests with Standardized Cat Hair Extract. To help prevent this, a patient should be skin tested initially by the prick or scratch method. If a positive response is NOT observed, an intradermal skin test may be performed with a more dilute solution of the extract. Oral antihistamines and topical corticosteroids may be administered to relieve itching and swelling resulting from large skin test reactions. Local Reactions From Subcutaneous Injections The occurrence of a hive 5 to 15 minutes after the subcutaneous injection of extract is usually due to leakage of extract into the skin along the needle tract. Firm pressure (not rubbing) at the site of injection immediately after withdrawal of the needle will usually prevent this reaction. It does not require a reduction in dosage. …
Source: FDA drug label, Allermed Laboratories, Inc., effective June 3, 2025 (SPL set abffdafd-f922-44ab-8e98-972a72ca1004), via openFDA; the full label on DailyMed
What do FAERS reports show?
163 reports list felis catus hair among the medicines taken, each a report of something that happened, not proof the medicine caused it; 0 are coded as a death and 7 as a hospital stay. Counts follow how widely a medicine is used and watched, and they are not a measure of how risky it is. Of the 24 reactions below, 2 are named by the same term (in US spelling) in the label's adverse reactions, warnings or patient leaflet; a reaction the label does not name may still be there under another word, and a report does not show that the medicine caused it.
The 25 most reported reactions
Source: FDA Adverse Event Reporting System (FAERS) via openFDA, reports through July 30, 2026; reactions as MedDRA preferred terms
What next?
- Felis catus hair: the full record
- label, generics, price, shortages, recalls
- Report a side effect to the FDA
- MedWatch
- Side effects hub
- the most reported medicines and reactions