You will want a DA like caber or prami for the adverse sides from DECA including "deca dick" but NOT limited to it. I would be equally concerned about getting manboobs! That being said, I would find out which one of these 2 DA are the preferred one for you asap. If you let your progesterone levels get out of whack, you'll probably never do DECA again.
Viagra is good for 24 hours
Cialis the weekend warrior
Neither viagra or cialis will help "decadick" lol... if that doesn't scare you straight, nothing will
16-20 weeks? You will need a massive supply of everything for this cycle to be a successful one.