Capstar is an oral tablet that consists of swift action adulticide for the control of adult fleas on dogs. It starts producing results within half an hour of administration and kills 100% adult fleas within 7 hours. It is completely flavorless and is safe to be administered on pregnant and nursing dogs. The effect of the treatment lasts for 24 hours. It can be given anytime to the dog whenever you see fleas bothering him, but ensure that you give only one dose in 24 hours. This tablet is recommended for puppies and dogs at least 4 weeks of age.