Vitamins will not. They boost your immune system, and are not exactly hormones that would interfere with the hormones from the pill. antibiotics is the main medication that affects the effectiveness of the pill. HOWEVER, be aware of what hormones are in your pill because you should always check. I wanted to take a flu pill, and the box said not to take with <insert complicated pill hormone here> because it reduces effectiveness. I wasn't going to be having sex any time soon, and my flu was killing me, so I took it anyway.

P.S. Kudos on using the words "affect" and "effect" correctly.