"i have used it without scares for 17 years.  i have found my libido seriously lowered. no periods once i got past the initial 2 or 3 jabs. worth persisting. may have some bleeding if you are late for a shot. for the first few shots bleeding can be heavy and irregular but this seems to usually settle after about 3 shots and i had no periods after that time, unless i was getting late my shot late."