In 2020 I tried Diphenhydramine HCI 25 Mg – Kirkland Brand.
They did seem to work. It helped my Dad, as well.
My brother bought Kirkland in the States, inexpensively. Over the counter. Pink tablets.
Some people do experience side effects.
As I couldn’t find it quickly in Canada, I ordered something that looks identical from Amazon.ca.
I acquired allergies later in life. In Calgary they start about May 15th, end about July 1st.
In B.C. with a much milder climate, everything is about 2 months earlier. In 2020 I was suddenly mostly better about May 1st. And stopped taking the pills.
Before this year I mainly treated Spring Allergies by fleeing somewhere else in the world. OR … a combination of exercise and frequent showers.