🐶 Say Goodbye to Fleas in a Flash! Suitable for dogs and puppies 4 weeks and older. Reinfestations? Dose daily for ongoing protection. Starts killing fleas in just 30 minutes! Trusted by professionals for your furry friend. No prescription required, just pop a tablet! Fast-Acting For Small Dogs No Prescription Needed Capstar (nitenpyram) is a fast-acting oral flea treatment designed for dogs weighing 2-25 lbs. This vet-recommended medication starts killing adult fleas within 30 minutes and is safe for dogs and puppies 4 weeks and older. With 6 doses available, it provides a convenient solution for flea infestations without the need for a prescription.