A hen s beak is full of nerve tissue it is, after all, her principal means of relating to her environment but no anesthetic or analgesic is used to relieve the pain.

Ketamine a drug primarily used as an anesthetic in veterinary medicine and as a short term anesthetic and analgesic in hospitals during surgery or other painful procedures is currently the rising star of depression research.

Fentanyl (also known as fentanil, brand names Sublimaze, Actiq, Durogesic, Duragesic, Fentora, Matrifen, Haldid, Onsolis, Instanyl, Abstral, Lazanda and others) is a potent, synthetic opioid analgesic with a rapid onset and short duration of action.

In 2006 Herta Flor, at the Department of Clinical Neuroscience, University of Heidelberg, stated that Several studies, including large surveys of amputees, have shown that most currently available treatments for phantom limb pain, which range from analgesic and antidepressant medication to stimulation, are ineffective and fail to consider the mechanisms that underlie production of the pain .