Prescription items are NON-RETURNABLE and NON REFUNDABLE Credelio Chewable Tablet Credelio kills adult fleas and is indicated for the treatment of flea infestations (Ctenocephalides felis) and the treatment and control of tick infestations [Amblyomma americanum (lone star tick), Dermacentor variabilis (American dog tick), Ixodes scapularis (black-legged tick) and Rhipicephalus sanguineus (brown dog tick)] for one month in dogs and puppies 8 weeks of age and older, and weighing 4.4 pounds or greater. 6 Month 012ELC-25-50-6 PX101043 727804356859