The permethrin in R.I.P. Fleas Extra is a fast-acting, long-lasting insecticide which will kill any adult fleas and flea larvae it comes into contact with.
The S-methoprene in R.I.P. Fleas Extra is a long-lasting insect growth regulator which prevents flea eggs and larvae from developing into adults for up to 12 months.
Therefore, R.I.P. Fleas Extra protects your home against flea infestations for up to 12 months.