Can Cannabinoids Work as Pain Relievers? A Review of the Evidence | Research

The takeaway

Preclinical and clinical evidence supported cannabinoids as potential analgesic agents, particularly as opioid-sparing compounds that could allow lower opioid doses with fewer side effects.

Read this if you are interested in alternatives or supplements to opioid pain medication.

Cannabinoids acted synergistically with opioids, potentially allowing lower doses and fewer side effects

What the researchers found

This review examined the history, pharmacology, and clinical data on cannabinoids as pain treatments.

Clinical and experimental studies showed that cannabis-derived compounds act as antiemetic, appetite-modulating, and analgesic agents. However, the effectiveness of individual products varied depending on the route of administration.

A key finding was that cannabinoids act synergistically with opioids, functioning as "opioid-sparing agents" that allow patients to use lower opioid doses with fewer side effects. With opioids being the primary therapy for severe pain at the time of publication, this synergistic potential was highlighted as particularly significant.

Why it matters

The opioid-sparing potential of cannabinoids was an early articulation of what would become a major research theme as the opioid crisis intensified in subsequent years.

The numbers in context

The review covered preclinical and clinical studies without specifying exact counts. Route of administration was identified as a key variable affecting analgesic efficacy.

How the study worked

This was a narrative review covering the history of medical cannabis, cannabinoid signaling pathways, and preclinical and clinical data on cannabinoid analgesic effects.

What this study cannot tell us

As a narrative review, no systematic quality assessment was performed. The clinical evidence at the time was limited, and many findings were preclinical. The review emphasized potential without fully addressing the variable and sometimes disappointing clinical trial results.

How to read the evidence

Narrative review summarizing a mix of preclinical and limited clinical evidence, with varying study quality across sources.

When this study was published

Published in 2009. The opioid-sparing concept has received significantly more research attention since then, with mixed but generally encouraging clinical results.

The bigger picture

This review was published early in what would become a global reckoning with opioid dependence. The idea that cannabinoids could reduce the amount of opioids needed for pain control gained increasing attention in subsequent years.

Questions still open

Which specific cannabinoids are most effective for which types of pain? Can cannabinoid-opioid combination therapy meaningfully reduce opioid prescriptions? What routes of administration optimize analgesic effects?

Common questions

Can cannabinoids replace opioids for pain?

The review did not suggest cannabinoids could replace opioids entirely, but rather that they could work alongside opioids to reduce the dose needed, potentially lowering side effects and dependence risk.

Why does the route of administration matter?

Different routes (smoking, oral, sublingual, topical) affect how quickly and how much of the active compound reaches the bloodstream and target tissues, which influences both effectiveness and side effects.

Read the original research

The analgesic potential of cannabinoids.

Journal of opioid management, 5(6), 341-57

View on PubMed ↗

Citation

Elikkottil, Jaseena; Gupta, Pankaj; Gupta, Kalpna. (2009). The analgesic potential of cannabinoids.. Journal of opioid management, 5(6), 341-57.