ive never felt it was a good idea to inject anyone with hormones of the opposite sex. i realize in some cases it may be medically needed, but for something like birth control it just doesnt seem like a good idea to me personally. in my experience with my wife, and talking to other women, the pill is usually more trouble than its worth. weight gain, magnified cramps, mood swings, etc. there are other just as effective methods without the need for chemicals.
i wont be taking any boob juice any time soon. it was worth having a vasectomy just to have my wife more balanced in her mood, and we already have all the children we need.