Is taking pills wrong from a religious standpoint if birth control is a side effect?

My wife is a Type2 diabetec. I can't remember the name of the specific type of pill, but it's to help her with her condition and get certain levels to their proper places. Speaking from a Catholic standpoint, it sometimes upsets me knowing she's taking these pills since we both would love to have children. But do you think it's necessarily a bad thing if these pills were perscribed for her condition and birth control is a side effect? A priest once told us that no medical condition can ever override a moral issue. Any input? Thanks!