Drug profile

The FDA adverse-event record for Felv

12 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Felv. See the species affected, top reactions, and outcomes below.

12
adverse-event reports
0.0%
death-coded share
Cat
most-reported species
3
Not eating - top reaction
Verify with FDA CVM →
Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
12
Total Reports
0
Deaths Reported
0.0%
Death Rate

Active Ingredients

Felv

Administration Routes

UnknownSubcutaneous

Species Affected

Cat 12

Most Affected Breeds

Domestic Shorthair 8
Domestic Longhair 3
Manx 1

Most Reported Reactions

Not eating 3
Lethargy (see also Central nervous system depression in 'Neurological') 2
Open mouth breathing 2
Shaking 2
Hair loss NOS 2
Lethargy (see also Central nervous system depression in Neurological) 2
Itching 2
Reluctant to move 1
Injection site pain 1
Leucocytosis NOS 1
Azotaemia 1
Hyperphosphataemia 1

Outcome Breakdown

Ongoing
11 (91.7%)
Recovered/Normal
1 (8.3%)

Felv Adverse Event Insights

12 reports name Felv; 0 recorded a death outcome (0.0% of reported events, not a population-level mortality rate). Active ingredient: Felv. Administration routes: Unknown, Subcutaneous.

By species: Cat (12 reports). By breed: Domestic Shorthair (8), Domestic Longhair (3), Manx (1).

Leading clinical signs: Not eating (3), Lethargy (see also Central nervous system depression in 'Neurological') (2), Open mouth breathing (2), Shaking (2). Outcome, 12 coded reports: Ongoing leads at 91.7%.

Read these counts as reporting volume, not risk: per our methodology, a widely-prescribed drug will rack up more raw FDA reports in a given year than a rarely-used one at an identical true rate, so we recommend comparing within similar-exposure products rather than across the full 2025 catalog.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

Every figure on PlainBreed is rendered directly from FDA openFDA adverse event data, no number is typed in by an editor. This page draws directly on FDA openFDA data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.