The manufacturer of Sentry Sure Shot Liquid Wormer for Cat directions suggest for cats or kittens 6 weeks or older: Administer 1/2 teaspoon (2.5 mL) per 5 lbs. of body weight. *** Do not worm animal more than twice yearly except as advised by a veterinarian. This product is effective for those roundworm stages found in the intestine and does not remove migrating larval stages. Animals should be checked periodically by a veterinarian for presence of other parasites. Avoid freezing. Shake well before use. Mix proper dosage with an amount of any palatable feed that will be consumed in one serving. If possible, confine the treated cat or kitten for a day or two so that droppings can be collected and destroyed. Heavily infected animals may require a second treatment two weeks after the first.