Description from the vendor website:

Zodiac Infestop™ II Flea Topical Solution for Cats.

• Kills fleas rapidly
• Retains its ovicidal and larvicidal efficacy up to 4 weeks following a shampoo.
• Protects for up to 4 weeks.
• Can be shampooed, immersed in water, or exposed to rain 3 days after treatment.
• Controls fleas within 1 day of treatment
• The successive feeding activity of fleas on pets may elicit a hypersensitivity skin disorder known as flea allergy dermatitis (FAD). Infestop II Topical Solution rapidly kills fleas and may reduce the incidence of this condition.
• Provides flea infestation protection for at least 4 weeks
• For cats 7 months and older. Do not use on other animals.
• KEEP OUT OF REACH OF CHILDREN.
• READ THE LABEL AND INSERT BEFORE USING.
• 4 MONTH SUPPLY

Active Ingredients:
Imidacloprid 9.1%, Pyriproxyfen 0.46%

Pests Controlled:
Kills fleas and flea eggs.