Most medications will specify how often they should be administered, but there is a general rule of thumb when it comes to these sorts of things. The system is mostly dependent on the age of your feline friend. For kittens, it is best to deworm them once every two weeks until they reach the age of twelve weeks. Subsequently, administering deworming medicine every month until they clock six months of age is advised. After the six-month marker, a good deworming medication should be administered once in three months in order to keep the worms at bay.\r