My question on this is not the recreational aspects of an E.D. drug, but the question would be: Why? I legitimately suffer from E.D. and can tell you that the oral E.D. medications are definitely not magic and are very much "over-rated" as recreational drugs. The method of operation of both drugs is such that it still takes sexual stimulation to get things up. The only difference in a percentage of people is that the drug provides enough "boost" to make some males multi-orgasmic.
When I was on Viagra the biggest down side was that it made ejaculation at times difficult. I would get just to the edge and then lose it. This is definitely not edging which causes things to build and then recede a little then build again. What happens is that when the peak is not reached you crash completely and start over again. This is almost like a completely new form of sexual disorder all in itself.
There are numerous ways to pick up an erection. The three most common oral medications currently given under Rx are probably somewhere in the middle of the road for true effectiveness.
Personally, I got really tired of the hit and miss and I went to a specialist who to simplify things put me on injectable quadmix. Personally, it is cheaper than the pills including the syringe and it works like gangbusters 100% of the time. That IS an erection that is chemically induced and is hard as granite.
I sustained an injury as a teenager that came back and has haunted me as an adult. I am very grateful for quadmix and that IS the ultimate erection. It is also far safer if used with common sense. Personally, you are spending a huge chunk of change on something with very limited value and an element of risk. Again, the main risk on an oral is not priapism. (Trazadone, a common anti-depressant) has a far higher risk than the E.D. drugs we are discussing.
If your plumbing is working great you can get a boost and some additional fun out of things already mentioned in another location on this board. I would not waste my money on the E.D. stuff. Arginine and a few other simple things will give a 100% healthy individual a boost for a little fun outside the norm to break up the boredom. Play it safe, go that route and save the other stuff for a rainy day if you need it.