what drugs are norepinephrine reuptake inhibitor?
['Desvenlafaxine (Pristiq)', 'Duloxetine (Cymbalta) — also approved to treat anxiety and certain types of chronic pain.', 'Levomilnacipran (Fetzima)', 'Venlafaxine (Effexor XR) — also approved to treat certain anxiety disorders and panic disorder.']