Skip to the explorer PatientsCann UK · Patient education From Seed to Patient: the UK medical cannabis pipeline Every legal prescription in the UK travels the same route: a controlled growing room, a licensed factory, an accredited laboratory, a border, a specialist clinic and a pharmacy. This explorer walks you through all six stages, compares the seven formats a patient can be prescribed, and shows you how to read the paperwork that proves it. 6 regulated stages 7 patient formats Quality and science inspector This is education, not medical advice. Onset and duration figures are typical ranges reported for each route. Your own response depends on your dose, your product and your body. Never change how you take your medicine without speaking to your prescriber or pharmacist. See all patient resources 1 The seed to shelf journey 2 Formats and delivery pathways 3 Quality and science inspector The six stages of a legal UK prescription Select any stage to open the detail. Each one has its own quality standard and its own regulator, and a batch cannot move forward until the stage before it has been signed off. 1Genetics and GACP growing 2GMP processing and extraction 3Laboratory testing and CoA 4Licensed import and border 5Specialist prescribing 6Pharmacy dispensing Stage 1 of 6 1 Genetics, breeding and GACP cultivation Where the medicine starts: a known plant, grown the same way every time. Standard GACPRegulator DEFRA and origin inspectors What happens here A licensed grower keeps a small number of mother plants and takes cuttings from them, often through tissue culture, so that every crop is genetically the same plant rather than a new cross. Growing rooms are closed loop: light, temperature, humidity, carbon dioxide and air filtering are all controlled and logged. Mother plant care and cutting or tissue culture cloning Batch to batch genetic stability, checked crop by crop Sealed rooms with filtered air and monitored water feeds Quality standard GACP (Good Agricultural and Collection Practice). It sets how the plant is grown, fed, harvested and handled. In practice it means no synthetic pesticides, and soil, water and fertiliser chosen so the plant does not draw heavy metals up into the flower. Where the flower is dispensed as it is, GACP alone is not enough: the maker has to write down the point at which production of the active substance begins, and for whole flower that point is the growing room. Who regulates it DEFRA in the UK, alongside the agricultural inspectors of the country the crop is grown in. Growers are inspected and have to keep records for every batch they release. One decision sets the whole rulebook What the crop is going to become decides where pharmaceutical rules start. It is the single most important point in the chain, and the one most often got wrong. If the flower itself is the medicine The plant is the active substance Propagation Cultivation and flowering Harvest, drying, curing Packed flower, dispensed as it is Annex 2, biological medicines Nothing downstream can purify or sterilise a dried bud, so quality has to be built in from the cuttings onward. Annex 2 recognises that manufacture can begin at propagation. If the flower will be extracted The plant is a starting material Propagation Cultivation and flowering Harvest and drying Extraction and formulation Annex 7, herbal starting materials Here quality is defined later. Extraction, filtering and purification can take impurities out, so the plant is grown under GACP and pharmaceutical rules begin at the processing step. Why sameness matters A prescription only works as medicine if the next jar behaves like the last one. Controlled genetics and controlled rooms are what let a pharmacist put a fixed cannabinoid percentage on a label. Illicit supply has none of this: the same street name can be a different plant, grown a different way, with a different strength every time, and nobody has tested it. Next: GMP processing 2 Pharmaceutical processing and GMP extraction The crop becomes a pharmaceutical product in a cleanroom. Standard EU and UK GMPRegulator MHRA What happens here Harvested flower is dried and cured at a set temperature and humidity, then milled to a controlled particle size for vaporising. For oils and cartridges the plant material goes through supercritical carbon dioxide extraction, then winterisation to strip out fats and waxes, with any solvent recovered and accounted for. Controlled drying, curing and precision milling Cold carbon dioxide extraction under pressure Winterisation, filtration and solvent recovery Standardising the extract to a fixed cannabinoid strength Quality standard EU and UK GMP (Good Manufacturing Practice). Work happens in cleanrooms with ISO class 5 and class 7 air handling and positive air pressure, so air always flows out of the clean space rather than into it. Every step is written down, signed and traceable to the batch. The rulebook is EudraLex Volume 4: Part I for finished medicines, Part II for active substances, and Annex 2 for medicinal cannabis intended for use as whole flower. Quality risk management sits across all of it. Who regulates it The MHRA, the UK medicines regulator. A site that makes or releases a medicine for UK patients has to hold and keep its GMP certification through inspection. Three routes out of the same growing room Where GACP stops and GMP starts depends on what the batch is going to become. Requirements tighten at every step closer to the patient. GACP, pre harvestGMP, post harvestGood distribution practice Bulk flower for extractionMother plantsRooting and hardeningLarge scale cultivationharvestFast fan assisted dryingMachine trimmingBulk packaging and shippingExtractionActive ingredientFormulationFilling and packaging Sold on as feedstock, so the later GMP steps happen at another site. Extracts, including oils, hash and rosinMother plantsRooting and hardeningLarge scale cultivationharvestFast dryingMachine trimmingExtractionActive ingredientFormulationFilling and packagingDistribution Processing can remove impurities, so the finished extract is standardised before it is filled. Finished packaged flower (Flos)Mother plantsRooting and hardeningSmall scale cultivationharvestWet hang harvestSlow cool dryingHand trimmingCuringPackagingDistribution Covered end to end by GMP Annex 2. The flower itself is the finished medicine, so nothing can be cleaned out of it
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