If you are asking, “how do you take medical cannabis?”, the useful first answer is that it depends on the medicine you have actually been prescribed. Cannabis-based medicinal products can be supplied in different forms. The form, product and written instructions are part of the clinical decision; they are not a menu for a patient to work through alone.
That distinction matters. A word such as oil, flower, capsule or vape can help you understand a conversation with a clinic or pharmacy, but it does not tell you what will suit you, how much to use, or when to use it. If anything on the dispensing label or accompanying instructions is unclear, ask the prescribing team or dispensing pharmacy before making changes.
This guide explains the language around the main forms, not how to use a particular medicine. For the wider route to a medical cannabis prescription in the UK, start with MCPH’s prescription-process guide.
Why the form is part of the prescription
“Medical cannabis” is a broad term. In UK guidance, cannabis-based medicinal products include different kinds of regulated medicines, from licensed products to some unlicensed preparations supplied through the appropriate medicines framework. NHS England notes that these products may be available in a range of pharmaceutical forms, and that the decision to prescribe has to consider the person’s clinical condition, other medicines, evidence, preferences and the suitability of other treatments.
So a medical cannabis prescription is not simply a prescription for “cannabis”. It should identify the medicine supplied and be accompanied by the information you need to use that medicine safely. The NHS advises people to keep prescribed medical cannabis in its original packaging, which includes the dispensing label.
Oils and oral liquids
People often use “oil” as a shorthand for a liquid cannabis medicine. The exact description on a prescription may instead say oral solution, oral liquid or give the medicine’s name.
One NHS example is Epidyolex, a highly purified cannabidiol (CBD) liquid used for specific rare epilepsy syndromes under specialist care. That example does not mean that any CBD oil bought online is the same thing. NHS and NHS England guidance distinguish prescribed medicinal products from consumer CBD or hemp products sold online or in shops; those consumer products are not a substitute for a prescribed medicine.
If your prescription is for a liquid, use the exact instructions supplied with that medicine. This page cannot tell you a dose, timing or measuring method because those details are individual to the prescription.
Capsules
Capsules are another familiar medicine form. The NHS gives nabilone as an example: a capsule medicine that acts in a similar way to THC and may be prescribed by a specialist in a specific chemotherapy-related setting when other options have not helped or are unsuitable.
The wider point is simple: a capsule is not automatically interchangeable with an oil, spray, flower or another cannabis-based product. A capsule’s name on the label, its active ingredients and the professional instructions are what matter. Do not swap forms, use an old supply or treat a form mentioned online as an alternative to your prescribed medicine without speaking to the prescriber or pharmacist.
Mouth sprays
Some prescribed cannabis medicines are supplied as sprays used in the mouth. The NHS describes nabiximols (Sativex) as a cannabis-based medicine supplied as a mouth spray for adults with MS-related spasticity in its licensed UK indication.
This is a useful example of why form and indication should not be separated. The fact that a medicine is a spray does not tell you whether it is right for another condition, or how an individual should use it. Follow the medicine-specific instructions rather than general descriptions found online.
What does flower mean on a prescription?
Cannabis flower usually refers to the dried flowering tops of the cannabis plant. It is a term that patients may see in specialist medical-cannabis settings, alongside terms such as oil or capsule. MCPH’s cannabis flower glossary entry explains the term in more detail. For a plain-language comparison of two common terms, see medical cannabis oil versus flower.
For a patient, the important point is not to infer a recommendation from the word flower. It does not show that flower is appropriate for you, available to you, or preferable to another form. NHS England’s guidance makes clear that prescribing is a clinical decision, and that most cannabis-based medicinal products are unlicensed, so normal medicines governance and individual assessment matter.
If flower appears on clinic paperwork or a pharmacy label, ask the dispensing pharmacy or prescriber to explain the exact prescribed product and the written instructions that apply to it. Keep the discussion tied to your own prescription rather than social-media descriptions, product lists or someone else’s routine.
What does vaping mean in a prescription context?
People may use the word vape when discussing a prescribed cannabis product or a delivery method. It is not a prescription instruction in itself. Do not assume that a device, technique, timing or route is suitable because you have seen “medical cannabis vape UK” in search results or online discussion.
MCPH has a separate explainer on vaping prescribed cannabis versus smoking. Read that for context, but use the instructions supplied for your own medicine and check uncertainties with your clinical team or dispensing pharmacy. This is particularly important if a form, device or instruction is new to you. This guide does not tell you to inhale, heat or otherwise administer a prescribed product; use only the medicine-specific instructions provided to you.
Do not treat general online information about smoking or vaping as an instruction for your own prescription. Nor should a patient adapt a medicine, change its form or buy an unregulated product to recreate something they have read about online. UK guidance distinguishes regulated medicinal products from cannabis and CBD products purchased as consumer goods.
Other terms you may encounter
You may see clinical language that sounds more complicated than it needs to:
- Cannabis-based medicinal product (CBMP or CBPM): the formal umbrella term used in UK guidance.
- Licensed medicine: a medicine that has a marketing authorisation for a particular use.
- Unlicensed medicine: a medicine supplied outside a marketing authorisation. It is not the same as an illicit product, but it is not assessed by the MHRA in the same way as a licensed medicine. It needs appropriate prescribing and dispensing oversight.
- THC and CBD: two cannabinoids often discussed in medical cannabis information. They do not, on their own, tell you what a prescribed product will do for you or whether it is suitable.
If the terminology itself is the problem, the MCPH patient guide and glossary can help you prepare for a clearer conversation with the people responsible for your care.
What to check when your medicine is supplied
You do not need to become an expert in every product form. You do need enough information to identify your medicine and know who to contact if something does not make sense.
Check that you have:
- the medicine in its original, labelled packaging;
- the name of the medicine as supplied, not only a general term such as “oil” or “flower”;
- the written instructions from the prescriber or dispensing pharmacy;
- a contact route for questions about the supply, instructions, side effects or possible interactions.
The NHS notes that medical cannabis can cause side effects and that CBD and THC can affect how other medicines work. Raise possible interactions with the specialist, and report side effects to your medical team. MCPH’s side-effects guide explains the practical warning signs and reporting route in more detail.
Questions worth taking to the prescriber or dispensing pharmacy
These questions can keep the conversation clear without asking an article to make the decision for you:
- What is the full name of the medicine I have been prescribed?
- What form is this medicine supplied in, and what written instructions apply to it?
- Which instructions should I follow if the label and a previous plan appear different?
- Who should I contact if the medicine arrives differently from what I expected?
- What side effects or interactions should I report promptly?
- Is there anything I need to check before using other prescribed, over-the-counter or herbal products?
Those are information questions, not a substitute for medical advice. The person who prescribed or dispensed your medicine is best placed to explain the actual product in front of you.
The takeaway
Oils, capsules, mouth sprays and flower are words that may appear around medical cannabis, and some patients will also encounter the word vape. They are useful terms to understand, but they are not instructions or recommendations.
Use the dispensing label and medicine-specific written information as your starting point. If you are unsure about the form supplied, how to follow its instructions, or whether another medicine could interact with it, pause and ask your prescriber or dispensing pharmacy. That is the safest way to turn a general medical cannabis prescription question into an answer that fits your own care.
Sources
: NHS: Medical cannabis (and cannabis oils) : NICE NG144: Cannabis-based medicinal products : NHS England: Cannabis-based products for medicinal use (CBPMs) : GOV.UK: Drug licensing factsheet: cannabis, CBD and other cannabinoids This article is general information for UK patients and carers. It is not medical advice and does not replace the instructions provided with a prescribed medicine.
