Is only one ear red?
Is there any exudate in the ear (smelly liquid, black waxy material etc.)?
It sounds like he has had a problem with ears before.
What are the ingredients or the name of the drops?
Were you given a diagnosis (ear mites, infection, allergy)?
He is a new dog to me. I just got him this summer. The other woman had him before.
She gave me drops called dexamethasone ear solution. it is just in one ear and it is very red. He does have allergies.
Dexamethasone is a corticosteroid and would be used to treat allergic reactions. You can use it for this problem. Put a couple drops in the ear and some on the inside of the flap if it is red. Rub the base of the ear to distribute the solution in the ear canal.
You can also give benadryl if the dog seems uncomfortable. This will help control the reaction and help the dog sleep. A 50 mg tablet 2 times a day would be a reasonable dose for a Springer.
If the redness does not clear up within a day or so, a vet visit would be a good next step.