Medical Cannabis in Spain 2025: Complete Guide to Royal Decree 903/2025
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Introduction to Royal Decree 903/2025
Spain has reached a historic milestone with the approval of Royal Decree 903/2025, in force since October 2025. For the first time, the country officially legitimizes the use of cannabis for medical purposes in hospital and clinical settings. This represents a significant shift in Spanish healthcare policy, allowing specialized doctors to prescribe therapeutic cannabis to patients who need it.
The decree does not fully legalize cannabis but rather creates a specific pathway for controlled medical access. This means that patients cannot purchase medical cannabis in pharmacies like traditional medicines; instead, they must follow a precise hospital protocol that ensures safety, standardized dosage, and continuous clinical monitoring.
Pathologies that can be treated
Royal Decree 903/2025 specifies the medical conditions for which therapeutic cannabis can be prescribed. These include:
Chronic oncological pain
One of the primary uses is pain treatment in cancer patients. Medical cannabis has shown efficacy in reducing chronic pain resistant to traditional opioids, improving the quality of life of oncological patients during and after chemotherapy cycles.
Drug-resistant epilepsy
Patients with epilepsy resistant to conventional treatments (resistant to 2 or more anticonvulsants) can access medical cannabis. International studies have shown that CBD significantly reduces epileptic seizures, with success rates of 40-50% in these patients.
Multiple sclerosis and spasticity
Spasticity associated with multiple sclerosis often does not respond well to traditional drugs. Therapeutic cannabis, particularly THC combined with CBD, has shown efficacy in reducing muscle stiffness and improving mobility.
Nausea and vomiting from chemotherapy
Patients undergoing chemotherapy frequently suffer from severe nausea that reduces nutritional intake and quality of life. THC is a potent antiemetic (anti-nausea) that acts on the central nervous system, proving more effective than many pharmaceutical drugs in this context.
Idiopathic chronic pain syndrome
Patients with generalized chronic pain, when other treatments have failed, may benefit from medical cannabis. This includes conditions such as fibromyalgia and other chronic pain syndromes.
How to access: Hospital prescriptive pathway
Unlike other European countries where medical cannabis is available in pharmacies, the Spanish system maintains strict hospital control:
1. Specialized consultation
The first step is to visit a medical specialist (oncologist, neurologist, rheumatologist, etc.) in a public or affiliated private hospital. The doctor evaluates the patient's clinical history and determines if therapeutic cannabis is appropriate.
2. Complete medical evaluation
The specialist gathers a detailed medical history, verifies current medications (to rule out interactions), performs blood tests, and evaluates contraindications. All this is necessary to ensure patient safety.
3. Prescription and hospital authorization
If the doctor deems it appropriate, they write a special prescription. The hospital requests authorization from the Spanish Agency of Medicines and Medical Devices (AEMPS), which examines the case and approves the administration.
4. Administration in hospital
Medical cannabis is administered directly in the hospital under medical supervision. Doses are standardized, and the patient receives detailed instructions on how to take it at home.
5. Continuous monitoring
The patient undergoes regular medical check-ups to evaluate efficacy, side effects, and the need for dose adjustments. The duration of treatment depends on the medical condition.
Difference between recreational use and legal CBD
Medical Cannabis: Prescribed for specific pathologies, contains standardized doses of THC and CBD, administered in a hospital setting with medical monitoring.
Recreational use: Still technically illegal in Spain, although decriminalized in private spaces. Public possession remains punishable by fine.
Legal CBD: CBD products available in stores and online must contain less than 0.2% THC. They do not require a medical prescription and are considered supplements, not drugs.
Timeline and implementation in Spanish regions
The implementation of the decree varies slightly by region. More advanced autonomous communities like Catalonia and Valencia have already activated hospital protocols. Other regions are training doctors and preparing the necessary infrastructure.
It is estimated that by mid-2026, all Spanish public hospitals will have functional protocols for prescribing medical cannabis. Meanwhile, patients in regions where the system is not yet active can request access through compassionate use programs (special authorization for severe cases).
Case studies: Patients benefiting from medical cannabis
Various Spanish patients have already benefited from pilot programs. A patient with resistant epilepsy who had 8-10 seizures daily reduced episodes to 2-3 monthly after 3 months of medical cannabis treatment. Another patient with advanced cancer was able to drastically reduce opioid medications, decreasing side effects and improving quality of life.
Frequently Asked Questions (FAQ)
Is the treatment covered by public health insurance?
Yes, for patients in the Spanish public health system (Social Security), the cost of medical cannabis is covered. Patients only pay the standard co-payment for drugs (generally 10%).
Can I grow cannabis at home if prescribed?
No. Even with a medical prescription, private cultivation remains illegal. Cannabis must come from authorized suppliers.
Are there side effects?
Like all drugs, medical cannabis can cause side effects. The most common are drowsiness, dry mouth, and dizziness. The doctor monitors these effects and adjusts the dose if necessary.
How long does it take to work?
It varies depending on the condition. For pain, some patients notice improvements in days. For epilepsy, it may take weeks to see a significant reduction in seizures.
