From plant to bottle How cannabis becomes medicine By Thomas Kern Sci & Tech Health ... Print comment See in other languages: 8 See in other languages: 8 Languages: 8 (ar) قطرات ثمينة من القِـنّـب (de) Cannabis-Tropfen (es) Gotas de cannabis (fr) Gouttes de cannabis (it) Gocce di canapa (ja) 大麻のチンキ剤 (ru) Настойка на конопле (zh) 大麻酊剂 The cannabis contains around 5% THC (tetrahydrocannabinol), the psychotropic substance of the plant with therapeutic properties. The inflorescences are separated from the stems and leaves – painstaking, tedious work that is done by hand. After the work is finished, only a quarter of the original 150 kg cannabis crop is left. The approximately 40 kg of crushed cannabis flowers are kept in a refrigerator. The cannabis flowers are poured into a 70% alcohol solution. To remove the THC and other cannabinoids, the solution is stored for at least half an hour at room temperature, and then filtered. This procedure is repeated two to three times. The objective is to obtain a solution containing 10 mg of THC per millilitre. Out of 40 kg of cannabis flowers, around 120 litres of tincture can be produced. Each production step is standardised and all data are recorded. The cannabis tincture is then sold in pharmacies. This content was published on June 22, 2015 11:00 AMJun 22, 2015 - 11:00 Chemist Markus Lüdi is Switzerland’s only producer of a natural tincture made from cannabis. In his laboratory in Burgdorf in canton Bern he demonstrates how a liquid drug can be produced from cannabis flowers. (Photos: Thomas Kern, swissinfo.ch) Special reports Cannabis: the comeback of a banned medicine A multimedia investigation of the potential and limits of one of the most controversial plants of all time Neuer Inhalt Horizontal Line subscription form Form for signing up for free newsletter. Sign up for our free newsletters and get the top stories delivered to your inbox. Email address Top stories (weekly) Latest news (daily) Business (weekly) Politics (weekly) Society (weekly) Fintech (monthly) Click here to see more newsletters swissinfo EN The following content is sourced from external partners. We cannot guarantee that it is suitable for the visually or hearing impaired. swissinfo.ch Join us on Facebook!