You should see a real doctor who should check your general health condition before prescribing it. Your blood pressure and heart should be checked carefully. Those drugs could have a lethal effect in some conditions. I don't know why you post this question in this thread. there are specific threads for those questions. Otherwise, go in any "sans rendez-vous" clinic and you will easily get a prescription if there are no contra-indication. A real, in person, doctor will also tell you which drug is best for you. You are talking about Viagra but Cialis might be better. Only a physician could tell you.
My opinion is that such medical questions should be discussed in a thread like this one
https://merb.cc/xenforo/threads/viagra.49405/ in the Health Info section.