THC Oil

Key Takeaways

• THC oil is a liquid cannabis extract available legally in the UK only with a specialist prescription

• It is typically taken sublingually (under the tongue) or swallowed

• Medical-grade THC oil is lab-tested for precise potency and screened for contaminants

• THC oil differs from CBD oil: THC oil is psychoactive and prescription-only, while CBD oil is non-intoxicating and available over the counter

What Is THC Oil?

THC oil consists of concentrated cannabis extract suspended in a carrier oil, typically MCT oil or olive oil. It contains measured amounts of THC and may also contain CBD, minor cannabinoids, and terpenes depending on the formulation. In the UK, THC oil is a controlled substance — legal only with a prescription from a specialist doctor on the GMC Specialist Register. Learn more about medical cannabis and how prescriptions work.

How Is THC Oil Taken?

For detailed guidance on onset times, see How Long Does THC Oil Take to Work?

Is THC Oil Legal in the UK?

THC oil is legal in the UK only with a valid prescription from a specialist doctor. Without a prescription, possessing THC oil is illegal under the Misuse of Drugs Act 1971. Since November 2018, cannabis-based products for medicinal use (CBPMs) have been available on prescription as Schedule 2 controlled substances. Check our medical cannabis eligibility checker to see if you qualify.

THC Oil vs CBD Oil

Further Reading

• A Comprehensive Guide on How to Take THC Oil — full dosing methods, sublingual vs oral, and start-low-go-slow guidance

• How Long Does THC Oil Take to Work? — onset times by administration method

• The Ins and Outs of Prescribed Cannabis Oil — what to expect from a prescribed oil

• Browse medical cannabis products