“Medium” and “large” are shopping descriptions, not universal medicine weight bands. A cat can fall into differently named sizes across product ranges. Start with an accurate weight and the exact formulation your veterinarian recommends.
| Product range | Labelled cat bodyweight | Age condition | Listed packs |
|---|---|---|---|
| Stronghold — selamectin | 2.6–7.5 kg | Not for cats under 6 weeks | 3-dose pack · 6-dose pack · 12-dose pack |
| Stronghold PLUS — selamectin + sarolaner | More than 2.5 kg, up to 5 kg | At least 8 weeks | 3-dose pack · 6-dose pack · 12-dose pack |
| Stronghold PLUS — selamectin + sarolaner | More than 5 kg, up to 10 kg | At least 8 weeks | 3-dose pack · 6-dose pack · 12-dose pack |
These are different formulations, not interchangeable treatments. The table uses the labelled kilogram ranges rather than rounded pound descriptions. Check the exact boundary on your supplied pack; do not guess when your cat is between bands.
Product information: Stronghold leaflet, Stronghold PLUS label conditions and Zoetis Stronghold PLUS range chart. The supplied product label governs use.
See kittens and small cats for the smaller listed bands. You can also browse Stronghold, Stronghold PLUS and customer product review excerpts.