What does “Controlled drug” mean?

A substance regulated under the Misuse of Drugs Act 1971 and the Misuse of Drugs Regulations 2001.

Controlled drug in plain English

A substance regulated under the Misuse of Drugs Act 1971 and the Misuse of Drugs Regulations 2001.

The Act creates the offences — possession, supply, production. The Regulations create the exceptions that allow lawful medical use, including possession of a drug supplied to you on prescription.

Cannabis remains a Class B controlled drug. A prescription does not change its classification; it brings you within an exception.

Frequently asked questions

What does controlled drug mean?

A substance regulated under the Misuse of Drugs Act 1971 and the Misuse of Drugs Regulations 2001.

Sources and further reading

Every factual statement on this page is drawn from the following public sources. Links open in a new tab and are not affiliated with Flora House.

  1. NICE guideline NG144: Cannabis-based medicinal products
  2. NHS: Medical cannabis (and cannabis oils)
  3. MHRA: The supply, manufacture, importation and distribution of unlicensed cannabis-based products for medicinal use

Patient guide · Written by the Flora House editorial team · Last reviewed: 8 September 2026