It is largely dependent on the type of birth control that is used, as well as the individual's reactions to it. Weight gain, changes in libido, and extreme mood swings are all common occurrences in certain people. Some folks don't have to deal with any of these issues. I'm not aware of any drugs that prevent you from having children in the future, but if you're concerned, talk to her doctor. When she prescribes the medication, her doctor will explain everything to you. The truth is that everything is correct. Unfortunately, if a woman does experience unfavorable side effects, there is a long road to recovery.