What is the difference between a DEA schedule and a UK class?

The US DEA schedule (I to V) ranks a substance by abuse potential and whether it has an accepted medical use. The UK Misuse of Drugs class (A, B, C) ranks harm to set criminal penalties. A drug can sit high on one scale and lower on the other.

Why is cannabis Schedule I in the US but Class B in the UK?

US federal law still lists cannabis as Schedule I, meaning no accepted medical use at the federal level, even though many states have legalised it. The UK classifies it as Class B, an intermediate harm tier. The two systems measure different things and disagree often.

Does the UK also have schedules?

Yes, but they are separate from the A/B/C classes. The UK Misuse of Drugs Regulations define Schedules 1 to 5 that govern how a drug may be prescribed, stored, and recorded. This tool shows the A/B/C harm classes used for criminal penalties.

What does Schedule I or Class A mean for penalties?

DEA Schedule I drugs have no accepted medical use and the tightest controls, while UK Class A drugs carry the harshest penalties, up to life imprisonment for supply. Both tiers represent the substances regulators consider most dangerous.

Is this list legally authoritative?

No. It is an educational reference. Drug classifications change, differ between countries and US states, and depend on formulation and intended use. Always consult current DEA, Home Office, or local regulations and a qualified professional for legal or medical decisions.

Drug Schedule Classification Reference

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Controlled substances are ranked by two very different systems on either side of the Atlantic. This reference lets you search a drug and see its US DEA schedule and its UK Misuse of Drugs class together, so you can compare how each regulator treats the same substance.

How it works

The US DEA schedule runs from I to V and ranks two things at once: abuse potential and whether the drug has an accepted medical use. Schedule I (heroin, LSD) means high abuse potential and no accepted medical use; Schedule V (some cough preparations) means the lowest abuse potential. Schedule II onwards all have recognised medical uses with tightening controls as the number falls.

The UK Misuse of Drugs Act classes — A, B and C — instead rank harm to set criminal penalties, with Class A (heroin, cocaine, ecstasy) carrying the most severe sentences. A separate UK Schedule 1–5 system governs prescribing and storage; this tool shows the A/B/C harm classes.

Notes

The two systems often disagree — cannabis is Schedule I federally in the US yet Class B in the UK — because they measure different concepts. Classifications also change over time, vary between US states, and can shift with formulation (for example codeine moves schedules depending on combination and strength). Use this as an educational starting point, not as legal or medical advice.