One of the greatest things about this tool is that you can also enter anything over-the-counter, supplements, topical creams, herbals, whatever you might be ingesting at the moment. One thing that I strongly recommend is to enter any illegal drugs that you may be taking, especially if you aren't mentioning these to your neurologist.
You can find out if Copaxone interacts with heroin, if you should be using Preparation-H while you are on baclofen or if your alcohol habit is not such a good combo with your Solu-Medrol. The site will also tell you if there are any food interactions with your drugs. Give it a try, it is actually a pretty fun way to do this research that could really save you from some problems.