Hi Jon, Have you thought of googling Tamsulion and Viagra, if you did you would find the answer you lookning for, from what I just read it saya with caution, but for me I would give it a miss, unless you doctor says differant, is this the same doctor who has put you on Tamsulosin? because he would have had it in his notes saying you had Viagra.
Good Luck
Ask a pharmacist. When it comes to drug interactions, they are usually far more knowledgeable than doctors, and have databases in which to look up interactions. It's good to ask the prescribing doctor too (and if you don't have a viagra prescription already, definitely tell your doctor about ALL medications and supplements you take).
We are not Doctors, and this would be a question for a doctor. - Blu