Legal Uses of Drugs in the UK

The word “drugs” covers a wide range of substances in the UK. Some are medicines that can be prescribed by doctors, while others are controlled because of their potential for misuse, dependence or harm. A drug can also have a legitimate medical or scientific use even when possessing it without the proper authority is illegal.

The UK uses different laws and classifications to control drugs. The Misuse of Drugs Act 1971 sets out the main legal framework, while the Misuse of Drugs Regulations 2001 controls how certain controlled drugs can be prescribed, supplied, possessed and used.

Understanding these rules can be confusing, particularly when a drug has both legal and illegal uses. This guide explains the UK’s drug classifications, the legitimate uses of controlled drugs and when certain substances can be legally used.

What Are Controlled Drugs?

Controlled drugs are substances regulated by UK law because they can cause harm, dependence or misuse. They are controlled under the Misuse of Drugs Act 1971 and related regulations.

The law places controlled drugs into Class A, Class B or Class C. These classes mainly relate to the seriousness of offences and the penalties that can apply to illegal possession, production or supply.

Controlled drugs are also placed into Schedules 1 to 5 under the Misuse of Drugs Regulations 2001. The schedules serve a different purpose. They determine the level of control placed on activities such as prescribing, supplying, possessing and administering a controlled drug.

A drug’s class and schedule are therefore not the same thing. For example, cannabis is a Class B drug under the Misuse of Drugs Act and is generally listed in Schedule 1 under the Misuse of Drugs Regulations, although certain cannabis based medicines are placed in Schedule 2.

Drug Schedules in the UK

The five schedules indicate how tightly a controlled drug is regulated for legitimate purposes. Schedule 1 generally contains substances with no recognised medicinal use in the UK, while Schedules 2 to 5 contain controlled drugs that can have medical, scientific or other legitimate uses under specific conditions.

What Are the Legal Uses of Drugs in the UK?

A controlled drug can have a legitimate use without becoming generally legal for recreational use. The law allows certain controlled substances to be used in healthcare, scientific research, veterinary medicine and other authorised activities.

Medical Treatment

Some controlled drugs are used as medicines because they have recognised medical benefits. Doctors, dentists and other authorised prescribers can prescribe certain controlled drugs when the relevant legal and clinical requirements are met.

Morphine, for example, is used for severe pain, while methadone and buprenorphine can be used in treatment for opioid dependence. Other controlled medicines are prescribed for conditions such as ADHD, anxiety, epilepsy, insomnia and pain.

The controls vary according to the drug and its schedule. Schedule 2 medicines generally have stricter requirements for prescribing, storage, record keeping and supply than drugs in the later schedules.

Pain Relief

Several controlled drugs have legitimate uses in pain management.

Morphine, fentanyl and oxycodone are examples of controlled opioids used for certain types of severe pain. Diamorphine, the pharmaceutical form of heroin, also has limited medical uses in the UK.

Their controlled status does not mean they have no medical value. It means their use is subject to additional safeguards because of their potential for misuse, dependence and other risks.

Treatment for Opioid Dependence

Some controlled drugs are used to treat people who are dependent on opioids.

Methadone and buprenorphine are commonly used in opioid substitution treatment. They can reduce withdrawal symptoms and cravings and help people move away from illicit opioid use.

These medicines are provided within a medical treatment plan. A person taking prescribed methadone or buprenorphine is therefore using a controlled drug legally when it has been supplied and used in accordance with the relevant requirements.

Medicinal Cannabis

Certain cannabis based products can be prescribed for medicinal purposes in the UK.

Specialist doctors on the GMC Specialist Register can prescribe cannabis based products for medicinal use in humans when the legal and clinical requirements are met. These products are subject to specific controls.

This does not make recreational cannabis legal. Cannabis remains a Class B controlled drug, and unauthorised possession, supply, production and cultivation remain offences.

ADHD Treatment

Some medicines used to treat ADHD are controlled drugs.

Methylphenidate, for example, is a controlled medicine that can be prescribed for ADHD. Other controlled medicines may also be used in ADHD treatment depending on the person’s circumstances and clinical needs.

Having a prescription allows the patient to possess and use the medicine for the prescribed purpose. It does not allow them to sell it, give it to another person or use it outside the instructions provided.

Other Medical Uses

Controlled drugs are also used in other areas of healthcare. The particular medicine depends on the condition being treated.

Some controlled medicines are used for epilepsy, anxiety, sleep disorders, pain and other health conditions. Their legal use depends on factors such as the substance, formulation, prescription status and purpose for which it is being used.

Can Controlled Drugs Be Used for Research?

Yes. Controlled drugs can be used for legitimate scientific and medical research in the UK, but the requirements depend on the drug and its schedule.

Schedule 1 drugs are subject to particularly strict controls and generally require a Home Office licence for legitimate possession, production or supply. Universities and research departments can have exemptions for certain activities involving Schedule 2 to 5 drugs, although other licensing requirements can still apply to particular activities.

Research can involve developing medicines, studying how a substance affects the body, investigating potential treatments or examining the risks associated with a drug.

Researchers must follow the relevant requirements for obtaining, storing, handling and disposing of controlled drugs. Legitimate research therefore does not mean that the substance becomes generally available or legal for personal use.

Can Drugs Be Used Legally in Veterinary Medicine?

Yes. Certain controlled drugs have legitimate uses in veterinary medicine.

Veterinary surgeons can use authorised medicines containing controlled drugs when the relevant requirements are met. Examples include certain medicines containing ketamine and other controlled substances. The Veterinary Medicines Directorate maintains an updated list of authorised veterinary medicines containing controlled drugs.

Veterinary practices also have legal requirements covering the storage, recording, administration and disposal of controlled drugs.

The fact that a controlled drug can be used for an animal does not mean that the same substance can be obtained or used freely by the public.

Can Drugs Be Used for Industrial Purposes?

Some controlled substances and parts of controlled plants can have legitimate industrial uses, but these activities are closely regulated.

Industrial hemp is a useful example. Licensed growers in the UK can cultivate certain low-THC cannabis varieties for the use of the plant’s seed and fibre, which are non-controlled parts of the plant. The licence does not allow growers to use the flowers or leaves, which remain controlled material.

Businesses involved in producing, possessing, supplying, importing or exporting controlled drugs may also need a Home Office licence. The requirements depend on the substance and the activity involved.

Is CBD Legal in the UK?

CBD itself is not a controlled drug under the Misuse of Drugs Act 1971 when it is pure and isolated. The legal position becomes more complicated when CBD is sold as a product because it may contain other cannabinoids that are controlled, such as THC.

CBD products sold as food or food supplements are also subject to food law. CBD extracts and isolates are treated as novel foods and require authorisation before they can legally be sold as food in the UK. GOV.UK states that there are currently no authorised CBD extracts or isolates as novel foods.

A CBD product should therefore not be assumed to be legal simply because it is labelled “CBD”. Its ingredients, formulation, intended use and route to market all matter.

Can Legal Drugs Still Cause Addiction?

Yes. A drug being legal or prescribed does not mean that it cannot lead to dependence or addiction.

Some prescription medicines can cause physical dependence when used regularly. Others can lead to addiction if they are misused, taken in larger amounts or used for reasons other than their intended medical purpose.

This can happen with controlled medicines such as opioids, benzodiazepines and certain other drugs. Alcohol and nicotine are also legal for adults but can cause dependence.

The important issue is not simply whether a substance is legal. It is how it is being used and whether the person is losing control over their use or experiencing problems because of it.

How AnorMed Can Help With Addiction Treatment

Legal access to a drug does not prevent it from becoming a problem. Someone can develop dependence on a prescription medicine or experience problems with alcohol or another legally available substance.

AnorMed is an independent addiction treatment referral service, not a rehab centre. Our advisors can help you explore suitable addiction treatment providers across the UK and Europe.

Depending on your circumstances, available options may include medically supported detox, residential rehab, outpatient treatment, psychological therapy and aftercare. We can help you understand the options and find providers that may be suitable for your needs.

FAQs

Can the same drug have different legal restrictions depending on its formulation?

Yes. The legal controls can depend on the drug’s preparation, concentration and how it is supplied. Codeine is one example, as some preparations are subject to stricter controls while certain low-strength preparations can fall under Schedule 5.

Can you legally grow low-THC cannabis in the UK?

Certain low-THC cannabis varieties can be grown under a Home Office licence for industrial purposes, mainly for producing fibre and seed. The licence does not allow the cultivation of cannabis flowers or leaves for general use.

Why can diamorphine be used medically if heroin is illegal?

Diamorphine is the pharmaceutical name for the substance commonly known as heroin. Pharmaceutical diamorphine is a Class A, Schedule 2 controlled drug and can be supplied for specific medical purposes under strict controls. Illicit heroin possession and supply remain illegal.

Can cocaine ever be used legally in the UK?

Cocaine is a Class A controlled drug, but it is also listed as a Schedule 2 substance. This allows limited and tightly controlled medical and scientific uses. Recreational possession, supply and use remain illegal.

Can a pharmacist refuse to dispense a controlled drug prescription?

A pharmacist may delay or refuse to dispense a controlled drug when there is a legal, clinical or safety concern. They may need to check the prescription, dosage, patient details or other requirements before supplying the medicine.