T.N.
Your doctor should have recommended a pharmacy because you aren't going to be able to walk into your local pharmacy and fill it. I've found them cheapest at online pharmacies, but which one depends on what is prescribed. Most have free shipping so I've often ordered different drugs from different pharmacies for the same medicated cycle. www.freedomdrug.com, www.schrafts.com, and www.alexanderdrug.com are the main ones.
I think the major side effects are pain in the butt :)