I've been thinking of trying a combination of these two with possibly some benzoyl peroxide to help clear my back acne.

I've tied the regimen and it helped some, but only summer cleared my back completely. I've tried tanning recently but it hasn't helped. I've also used Doxycycline but that turned every spot dark purple.

I do have some Glycolic Acid leftover that I try and use when spots get bad.

Anyways my question is, how many tubes of each of these should I get to start with, or how long should each tube last if I'm covering about 30-50 percent of my back? I'm a 6'1" 190 pound male who lifts weights so my back is wider than average.

the tubes I am talking about are either 15 or 20gm for the Clindamycin(even the mixed versions mentioned below) and 15gm for .1% Adapalene gel.

The Clindamycin I can get as a gel or cream it seems. I can also get it mixed with benzoyl peroxide 5%, Tretinoin(.025 and 1%), or zinc acetate? Would any of these be worth getting over plain Clindamycin?

I am doing this all legally, I just have options I can choose myself.

my main question is how long will each tube last? I will need a decent 3-4 month supply at a time.

Which form of Clindamycin mixture is best?

Should i use with benzoyl peroxide on nights i can stand to possibly possibly bleach anything? Would it be beneficial to use Vitamin B5 and Carnitine alongside?

should think about getting some tretinoin to try alongside, or afterwards?

also, any tips on a good dosing schedule or other help at all?