My doctor said she would send to a compounding pharmacy for the
Tri-mix (phentolamine,protaglandin E1, and papaverine)if could get the
correct mixture  or formula. I would like to use this mixture in the
Gel form. Would someone please tell the correct proportions of each of
the three chemicals? If the gel needs to be measured, I need the
amount of it also. Thank you.

This answer to an earlier question may be of interest to you:

http://answers.google.com/answers/threadview?id=141025