Yes, it is possible for ketamine to be legal in the UK, provided it’s supplied and used legally. Also, it’s a controlled substance. Ketamine has been classified as a Class B substance in the Misuse of Drugs Act 1971, and Schedule 2 of the Misuse of Drugs Regulations 2001.
This means that the same substance may be legally medically used yet it may simultaneously be an illegal substance to possess, supply, and/or produce. The legal position depends on how ketamine is obtained, possessed and used.
Why ketamine can be both legal and controlled
Ketamine is known to have a medical use, such as an anaesthetic. For this reason, it is still kept available in some controlled quantities for medical use, instead of being banned outright. In 2026, the Advisory Council on the Misuse of Drugs reviewed its harms and agreed to leave ketamine a Class B controlled substance.
Being controlled does not mean that every form of possession is automatically illegal. Access by healthcare professionals and patients is prohibited in the absence of medicines and controlled drugs legislation.
Class B explained
Class B is a category of drug defined by the Misuse of Drugs Act 1971. Ketamine is currently listed in the government’s list of class B drugs.
This is relevant simply because the act of possessing, supplying, producing, and other acts may be criminal offences. The specifics of course depend on the situation. The position can be changed upon prescript or legally required documents.
Ketamine is then classified as a class B drug, which describes it’s legal classification. It is not the same thing as saying that the use of prescribed ketamine is always illegal.
Schedule 2 explained
This is not a Class B classification, which is listed in Schedule 2. It is derived from the Misuse of Drugs Regulations 2001, which directly concerns the prescription, supply, possession and use of controlled drugs.
Ketamine became a Schedule 2 drug in 2015. This placed it in the framework of being a Schedule 2 controlled medication, with the associated prescribing and record keeping requirements.
Thus, the two expressions can’t be substituted for each other. The drug classification is listed in Class B and the regulation of a drug for legitimate use is included in Schedule 2.
Possession
Ketamine can constitute a criminal offence if possession is not lawfully obtained. The use of ketamine for medical purposes does not justify the general public’s possession of the drug beyond legitimate legal use.
A person who has ketamine as a prescribed medicine has a different legal position from someone who has obtained it through an unauthorised source. Under GOV.UK, the penalties for carrying controlled drugs range from fines to prison, depending on the circumstances and the drug. When in doubt, legal counsel might be an advisable course of action on a specific matter.
Supply
When it comes to supply, it doesn’t count as possession. Giving, selling or otherwise supplying controlled drugs without lawful authority can be an offence. This includes sharing drugs with another person. A person’s lack of payment does not mean that the act was illegal. Selling, dealing and sharing controlled drugs are included in offences that could lead to penalties on GOV.UK.
Any questions of specifics must be reviewed in the light of circumstances of particular cases, and not as a result of general information that may be found on the internet.
Prescription ketamine
If it is prescribed and supplied under the rules, Ketamine can be administered legally in medical environments. Additional controls apply to its use in medicine as it is a Schedule 2 substance.
Possession and supply doesn’t always make it legal. Prescribed medicines are those medicines that are given to someone and should be used as directed by the prescriber and under the law. Treatments should also be kept apart from the use of unregulated Ketamine. It’s not the same legal or clinical fact.
Travelling with prescribed ketamine
If you are carrying a prescription for the use of ketamine you may have additional regulations. GOV.UK recommends that those carrying controlled drug medicines carry a note to confirm that the medicine is prescribed for them.
Some restrictions may apply, particularly when people are travelling to the UK with controlled medicines; for example, limits are allowed on the quantity that can be carried outside of the UK for importation purposes.
Foreign travelers also should inquire about the foreign country’s rules. In the UK a medicine may be lawfully prescribed but have different requirements in other countries.
Why online purchase does not create an exemption
Buying ketamine online does not necessarily mean that it is legal. A website, social media account or internet-based seller may not establish an exemption to the UK controlled drugs legislation.
The legal standing depends on the drug, the source, the rights to the possession and the reason behind the supply. Some people may think that good products described as a medical, pharmaceutical or legal product on the internet are actually provided in a legal manner.
If you’re thinking about using medical ketamine, consult with an appropriate health care provider, not an unqualified dealer.
When legal advice may be needed
No general information can cover all scenarios to do with controlled drugs. Legal advice might be relevant if someone has been questioned by police, is worried about possession or supply, is involved in a court case or does not want to cross a border with prescribed ketamine.
For travel questions, the Home Office provides specific guidance on carrying controlled-drug medicines into and out of the UK. The main takeaway is that there’s no complete ban on ketamine, but it is not readily accessible either. It is used legally in the medical field in a controlled way.
References
https://www.gov.uk/guidance/controlled-drugs-personal-licences
https://www.gov.uk/government/news/acmd-announces-decision-on-the-classification-of-ketamine
Evidence last checked: 24 September 2026
