Bit of an update on this.
1) Do not come of this stuff cold turkey. I went about three weeks without an injection and my back broke out in white spots. Your skin will become blotchy and uneven. Now that I'm no 2 injections per week, it has evened out some what, but will probably take a long time to clear completely.
My advice, once you are ALMOST dark enough, drop down to say 2 injections per week and see how you go. Very slowly decrease the frequency from there, depending on how readily your body responds to the product. 1 injection per week (or preferably 2 smaller ones equivalent to one regular injection) will probably suffice for most people.
Once you are on this drug, it is VERY hard to stop using it completely (unless you are fine with having very uneven skin for potentially quite a long time, like 6 months or more). I think as long as you wean yourself off it, this shouldn't be too much of a problem.
2) Fuck I hate using this stuff without a girlfriend
Seriously, every night I have an injection, I end up waking up at about 3-4am with a raging hard on. And it doesn't go away. I had to get up and relieve myself so I could try to sleep. Woke up at about 5am, raging hard on again. FML