Are opioids effective analgesics and is physiological opioid dependence
benign?: Revising current assumptions to effectively manage long-term
opioid therapy and its’ deprescribing
Abstract
A reexamination of clinical principles of long-term opioid therapy
(LTOT) for chronic pain is long overdue amid the ongoing opioid crisis.
Most patients on LTOT report ineffectiveness (poor pain control,
function, and health), but still find deprescribing challenging.
Although prescribed as analgesics, opioids more likely provide pain
relief primarily through reward system actions (enhanced relief and
motivation) and placebo effect and less through anti-nociceptive
effects. The unavoidable physiologic LTOT dependence can automatically
lead to a paradoxical worsening of pain, disability, and medical
instability (maladaptive opioid dependence) without addiction due to
allostatic opponent neuroadaptations involving reward/anti-reward and
nociceptive/anti-nociceptive systems. This opioid induced chronic pain
syndrome (OICP) can persist/progress whether LTOT dose is maintained at
the same level, increased, decreased, or discontinued. Current
conceptualization of LTOT as a straightforward long-term analgesic
therapy appears incongruous in view of the complex mechanisms of opioid
action, LTOT dependence and OICP. LTOT can be more appropriately
conceptualized as therapeutic induction and maintenance of an adaptive
LTOT dependence for functional improvement irrespective of analgesic
benefits. Adaptive LTOT dependence should be ideally used for a limited
time to achieve maximum functional recovery and deprescribed while
maintaining functional gains. Patients on LTOT should be regularly
reevaluated to identify if maladaptive LTOT dependence with OICP has
diminished any functional gains or lead to ineffectiveness. Ineffective
LTOT (with maladaptive LTOT dependence) should be modified to make it
safer and more effective. An adequately functional life without opioids
is the ideal healthy long-term goal for both LTOT initiation and LTOT
modification.