Assertion: morphine's effect | /r/HasAspect | causal links
Facets:
value: in the snri class
type: OTHER
Source sentences:
text: The effects of serotonin and norepinephrine on pain, while not completely understood, have had causal links established and drugs in the SNRI class are commonly used in conjunction with opioids (especially tapentadol and tramadol) with greater success in pain relief.