I assume you are refering to AAS (Anabolic Adrogenic) steroids. If so, I think the side effects of steroids would out weigh the benefits of it's use. Plus, just taking steriods doesn't build muscle. You need a combination of taking steroids and an intense workout. It's not a "magic pill" but it's self. Sorry.
I forgot to add.....taking steroids and NOT working out could result in an enlarged heart. Thats because the heart would be the only working muscle and thats where the drug would focus.
Steroids take on whatever form the user is using them for. For example: a bodybuilder uses them to build muscle. A runner uses them to run faster etc. Therefore, the steroids are going to focus on the muscle(s) being exerted. In a case where you take steroids and don't workout the only muscle being exerted is the heart.
I'm not a doctor but this is the way I understand it based on my research.
I asked a few more questions at our last visit and it does seem that it would not help. The nurse told me that because the problem is not the muscle but the nerve that tells the muscle how to work that no matter how may muscles you have it has no bearing on the nerve that moves them. Which when I sat and thought about it really made sense.