It's recommended to wait 3 to 4 days after bathing your cat before deworming. This helps ensure the deworming medication is fully effective. Bathing may wash away the natural oils from your cat's skin, preventing the medication from penetrating and affecting its effectiveness.

At the same time, cats may experience stress after bathing, leading to decreased immunity and increased susceptibility to colds. Deworming at this time may cause even greater harm to the cat.