The variety of Co-analgesics is also used to treat severe chronic low back pain. In Spain there is a high usage of Pregabalin. In the UK Amitriptyline is commonly used.

  Source: Physician interviews conducted by GFK Heealthcare, March - May 2009
Focussing on severe chronic low back pain; you mentioned that you treat patients with severe pain due to severe chronic low back pain. Now think in your last 100 patients with this indication: How many of your patients did you treat with the following agents?