hi mainly depending on the weather some people start to suffer with it as early as feb and they start to use a nasel spray as soon as the symptoms start to appear. this will hopefully control all of your symptoms. If u have bad hayfever u can alaways use both tablets and the spray. if u want a non drowsy antihistamine u should buy one with the ingredient of Loretadine.It can go on up until Sept.But has someone has said people can suffer with allergys all year round . hope i have been of some help.