Medical Cannabis and Opioid Reduction: Evidence and UK Practice

The Opioid Problem in Context

• The UK has seen significant increases in opioid prescribing over two decades
• Chronic opioid therapy is associated with tolerance, dependence, and overdose risk
• Medical cannabis has emerged as a potential opioid-sparing tool
• Cannabinoids and opioids have synergistic analgesic effects — lower doses of each may achieve equivalent control

Medical cannabis is increasingly used alongside or instead of opioids for chronic pain in UK specialist practice.

Evidence and Clinical Approach

• 2017 systematic review: 64% reduction in opioid use in chronic pain patients using cannabis
• 80% of medical cannabis users who previously used opioids reported reduced opioid use after starting cannabis
• Project Twenty21 UK data shows meaningful opioid reduction
• Clinical approach: introduce cannabis, titrate to therapeutic dose, then begin slow opioid taper at 10% per month

Opioid reduction with medical cannabis is a gradual, supervised process requiring specialist oversight throughout the taper.