I really don't have an answer for you, since I take a different medication, Symbicort. I do know that when my asthma is "acting up" I must use it 2-4 times a day, but many times I only use it in the morning. This plan was worked out with my pulmonologist.

I would suggest that if you are finding a medication lass helpful than in the past, you discuss it with your doctor. There my be something else that would be appropriate for you. Have you talked to the prescribing doc about the lessening effectiveness?