Cannabis Terpenes Relieved Surgical and Fibromyalgia Pain in Mice via Non-Cannabinoid Pathway | Research

The takeaway

Four terpenes found in cannabis (geraniol, linalool, beta-caryophyllene, alpha-humulene) reduced pain in mouse models of post-surgical and fibromyalgia pain through adenosine A2a receptors, not cannabinoid receptors.

Pain researchers, pharmacologists, and those interested in the therapeutic potential of cannabis terpenes beyond cannabinoids.

What the researchers found

All four terpenes (200 mg/kg) produced time-dependent pain relief in both post-operative and reserpine-induced fibromyalgia mouse models. The A2a receptor antagonist istradefylline blocked the antinociceptive effects, confirming the mechanism. Terpenes had no effect on hot plate latencies, ruling out non-specific motor effects. Geraniol showed the strongest effect.

Why it matters

Terpenes are the aromatic compounds that give cannabis strains their distinctive smells. Finding that they relieve pain through adenosine receptors (not cannabinoid receptors) means they could potentially be developed as non-psychoactive, non-opioid pain medications without the legal and regulatory challenges of cannabinoids.

The numbers in context

Four terpenes tested at 200 mg/kg. Pain relief strongest for geraniol, followed by linalool or alpha-humulene. Istradefylline (3.2 mg/kg) blocked antinociception. Two pain models: post-operative (paw incision) and fibromyalgia (reserpine-induced). Both sexes tested.

How the study worked

Male and female CD-1 mice underwent either paw incision surgery or reserpine-induced fibromyalgia (0.32 mg/kg). After pain was established, mice received 200 mg/kg ip of each terpene. Mechanical sensitivity measured via von Frey filaments over three hours. Mechanism confirmed by pre-treatment with A2a receptor antagonist istradefylline.

What this study cannot tell us

Animal model with high terpene doses (200 mg/kg) that may not be achievable in humans. Intraperitoneal administration does not reflect oral or inhaled routes. Reserpine-induced fibromyalgia is a chemical model, not a spontaneous disease. Effects measured over only three hours.

How to read the evidence

Well-designed mechanistic study with appropriate controls, multiple models, and mechanism confirmation, but animal data at high doses limits translational relevance.

When this study was published

Published 2025.

The bigger picture

The adenosine A2a receptor pathway is already a pharmacological target (caffeine is an A2a antagonist). Discovering that cannabis terpenes activate this pathway opens a new avenue for pain drug development that avoids the complications of both opioid and cannabinoid pharmacology.

Questions still open

Whether lower, orally achievable terpene doses would still produce meaningful pain relief in humans
Whether terpene combinations or entourage effects with cannabinoids enhance pain relief beyond individual terpene effects

Common questions

Are terpenes the same as essential oils?

Terpenes are major components of essential oils. The terpenes studied here (geraniol, linalool, beta-caryophyllene, alpha-humulene) are found in cannabis but also in many other plants like lavender, black pepper, and roses. Their pain-relieving properties work through a specific receptor pathway.

Could I get these pain benefits from smoking cannabis?

The terpene doses used in this study (200 mg/kg) are far higher than what you would get from smoking or vaping cannabis. While terpenes contribute to the cannabis experience, achieving pain relief at this level would likely require purified terpene preparations rather than whole-plant consumption.

Read the original research

Select terpenes from Cannabis sativa are antinociceptive in mouse models of post-operative pain and fibromyalgia via adenosine A2a receptors.

Pharmacological reports : PR, 77(1), 172-181

View on PubMed ↗Publisher’s paper ↗

Citation

Seekins, Caleb A; Welborn, Alyssa M; Schwarz, Abigail M; Streicher, John M. (2025). Select terpenes from Cannabis sativa are antinociceptive in mouse models of post-operative pain and fibromyalgia via adenosine A2a receptors.. Pharmacological reports : PR, 77(1), 172-181. https://doi.org/10.1007/s43440-024-00687-1