We have 1 cat with allergies (although her's are mostly in the form of bumps around her head and throat area). She usually doesn't need anything and when it start bothering her, she gets a non water bath thing that works well for her. Of course you must have two people to do it. If we have to give her a pill it is also a 2 person job. One person picks her up and hands her to the other person holding a towel and wraps cat in said towel. Then 1st person gets pill in hand, opens cat's mouth, puts pill in mouth, holds mouth closed and rubs (very lightly) cat's neck to make her swallow. This is litterally the ONLY way to get this cat to take a pill. Nothing else works at all. Oh and she is a tortishell. Good luck.