My wife says the exact same thing.

Japanese allergy, cold and sinus medicines are worthless.

We go to Costco in Canada, buy a whole lot of everything and leave it in our home in Japan. When the need arises, we always have a supply.

My wife hates hay fever. It is so bad for in Japan that she can't do anything for the spring months. She moved to Canada and discovered good hay fever medication and she got her life back.