No, you need a prescription because they will only prescribe it to you if you do a blood test. BUT you might be willing to find a pharmacy that will sell it to you illegally, use your accent and bring your US script with you.
If you are staying here for a while, you should just go to a doctor at a public hospital or a private one like Hospital Aleman. It is much cheaper here than in the US, so it is worth the doctor´s fees.
On a side note, I was prescribed it twice but never took it--scared the shit out of me. I also have friends who took it and all of them wound up doing two cycles, though they try to sell you on the "cure" aspect of it.