Frontline is a common spot-on treatment, which is quick and easy to apply:
Ensure your pet is old enough to be treated (usually eight weeks or older)
Remove your cat’s collar
Break off a single applicator, and open it by snapping back the tip
Pour the contents of the applicator onto your cat, just between the shoulder blades, by squeezing the liquid out
Avoid touching the liquid, and allow it to dry for 24 hours before allowing your cat to get wet