I take a Tamsulosin pill; 0.4 mg daily as well, have for about 6 yrs or more. It works well for me but one of the side effects I am dealing with affects the eyes (I have astigmatism, early glaucoma, cataracts/floaters) and my eye doctor wants to do the lens replacement on me ASAP as if I wait too long then this medicine will put my eyes in a condition where the eye surgery will not be as effective as it normally is.
Doctors and google fu recommend to avoid chocolate, coffee, tea, (go de-caf), etc., to help. I don't drink tea anymore, but have to have my coffee in the morning, and don't eat much chocolate so.
I use an prescription app called GoodRx and it will search your local pharmacies for the best price, etc. Most pharmacies take this app, a 90 day supply of Tamsulosin is around $20 for me with no insurance at this time for me, which is another reason for delaying the eye surgery. I turn 65 in late August, so this fall I will probably have the eye surgeries done.