Hey amazing steve: I can describe to you what it is like for me, but a lot of it depends on what kind you're on and how your body reacts. For the most part, the side effects aren't bad at all. I was afraid of it making me sick to my stomach, etc. When I first got on it, but it didn't at all. The only thing I really notice about the pill is that I am a little more moody and emotional than I used to be around my period than I used to be, my breasts are a little tender the week before, and I have worse cramps... But thats about it... Nothin big. For most women, the pill is suppsed to lessen pain associated with your perid. I must just be an odd ball. :) sometimes I get headaches when I didn't used to. There are more serious (but rare) side effects associated with bc, like increased risk of heart attack, stroke, blood clots, high blood pressure, but its just a risk you have to live with I guess. As long as your gf is healthy and active... I really wouldn't worry about those too much. There are a couple of benefits too... The pill can help clear up skin with acne, possibly decreased your chances of cysts and cervical cancer, and make periods more regular. Its worth a try because she'll never know how it will affect her until she trys it. It makes for better sex and is a lot better than worrying about a baby. Hope this helps! Let me know if you have any more questions!! :)