This article is from the Impotence FAQ, by Sine Nomine llama@drizzle.com with numerous contributions by others.
Bi-mix, also called PP, is a mixture of the two vasodilators
phentolamine and papaverine. Tri-mix or PPP is bi-mix with
prostaglandin E1 added. Some people report that bi- and tri-mixes work
where alprostadil (PGE1) alone fails. You will likely have to have
your pharmacist compound PP or PPP for you.
 
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