I’ve been using apoquel during the summer months for 3 years and it works well for us. We start late May and usually taper off end of September for seasonal allergies.
We get cytopoint injections at monthly intervals. Generally, Captain will begin licking his front paws which signals us that his seasonal allergies are bothering him. It is something we used for the first time when spring was here/summer was coming, and now again when fall is here/winter is coming (haha, game of thrones!!!). It seems to help almost immediately, and we go to the vet for administration of the medicine.