Medical Cannabis Dosage & Titration Calculator
Calculate precise bioactive THC and CBD milligram yields from prescription flower and sublingual oils, understand device extraction efficiency, and explore terpene boiling points.
Prescription Flower Parameters
Medical vaporizers (such as Storz & Bickel Mighty+ Medic) typically extract 60%–70% of available cannabinoids depending on temperature and session length.
Start Low, Go Slow: Patients naive to THC typically titrate starting at 2.5mg – 5mg THC per dose. Wait 15–20 minutes after inhalation to gauge onset before repeating inhalation.
THC delivered (mg) = [Weight (0.1g) × 1000] × [20% / 100] × [65% efficiency] = 13.0 mg
Statutory Medical Notice & Disclaimer:
This calculator provides theoretical mathematical estimates based on average device extraction efficiencies. Biological uptake varies based on inhalation technique, individual metabolic rate, and personal tolerance. Always titrate strictly under the supervision and prescribed dosage instructions of your GMC-registered specialist doctor.
Understanding "Start Low, Go Slow"
In UK specialist prescribing, clinical titration is designed to identify the Minimum Effective Dose (MED) that relieves symptoms without causing unwanted side effects or tolerance buildup.
For flower vaporisation, start with a 0.05g to 0.1g dose, take 1–2 slow inhalations, and wait 15–20 minutes before evaluating pain or symptom changes.
MHRA Vaporization Mandate
Under UK law, smoking prescribed medical cannabis voids your statutory legal defence under Section 5A(3) of the Road Traffic Act and Misuse of Drugs Regulations 2018.
Prescription flower must strictly be vaporized below 210°C to release volatile cannabinoids without generating toxic tar, carbon monoxide, or polycyclic aromatic hydrocarbons.
Recommended Medical Vaporizers
CE & UKCA certified dry herb vaporization devices for legal prescription administration
Mighty+ Medic Vaporizer
The gold standard in UK medical cannabis administration. The Mighty+ Medic is officially certified as a CE/UKCA medical device, delivering consistent, highly potent vapor with medical-grade precision.
Venty Vaporizer
Storz & Bickel’s fastest and most customizable portable device. Features an unprecedented adjustable airflow dial (up to 20 litres/minute) and a 20-second rapid heat-up time.
Frequently Asked Dosing Questions
How do you calculate milligrams (mg) of THC in dry medical cannabis flower?
Multiply the chamber weight in milligrams (e.g., 0.1g = 100mg) by the cultivar THC percentage (e.g., 20% THC = 0.20), then multiply by the vaporizer extraction efficiency (typically 60% to 70%). For example: 100mg flower × 0.20 THC × 0.65 efficiency = ~13mg of bioavailable THC.
What is the best temperature to vaporize UK medical cannabis?
For daytime symptoms and anxiety relief, temperatures between 165°C and 185°C vaporize lighter terpenes like Pinene, Myrcene, and Limonene with mild sedation. For severe chronic pain and insomnia, higher temperatures between 190°C and 205°C release heavier terpenes like Linalool and Humulene.
Why is smoking medical cannabis illegal in the UK?
Under The Misuse of Drugs (Amendments) (Cannabis and Licence Fees) Regulations 2018, smoking cannabis is strictly prohibited even if prescribed. CBPM flower must only be administered via dry herb vaporization using approved devices to avoid harmful carcinogenic combustion byproducts.
MCRx calculations are derived from peer-reviewed cannabinoid pharmacology data and manufacturer specifications. Individual physiological responses, bioavailability, and tolerance profiles differ. If you believe any temperature thresholds or mathematical ratios should be refined, please contact [email protected].