Vectra for Cats: Uses, Dosage, Side Effects | ThePetStep.com
Vectra dosage for cats. Make sure to follow your vet’s instructions properly. Like in case of all flea medications, the dosage usually depends on the weight and age of your cat [7, 8]. Vectra is available in two sizes, 0.8 ml (for cats & kittens over 8 weeks or 2-9 lbs), and 1.2 ml (for adult cats over 9lbs) in 3- or 6-dose packages [10].