Fentanyl
"I injured my back about 6 years ago.  I was put on all kinds of medicines until I met the best doctor in the world.  The doctor put me on the patch and it was the first time in 6 years that there was no pain at all.  But now the doctor is gone and no one else wants to write a prescription for the patch so I was left to suffer withdrawal for the first time in my life.  Great medicine but it will make you go through withdrawal and trust me it isn't fun. Many doctors are afraid to write the prescription for this medicine."