Street cannabis vs. pharmacy cannabis
Anyone considering a cannabis-based therapy is often comparing two very different worlds: what circulates on the black market as “weed”, and the pharmaceutical-grade cannabis flowers dispensed on prescription by a pharmacy. Both come from the same plant, but worlds lie between them.
1. Active-substance content: “roughly” vs. analytically proven
Street cannabis carries no ingredient declaration. THC content swings, sometimes considerably, from batch to batch; CBD content is often unknown; and any targeted combination is effectively down to chance.
Pharmacy cannabis is analytically tested. The packaging states the exact THC and CBD values, often supplemented by the terpene profile. Physician and patient can tune the dose accordingly, which is decisive for a therapy that runs over weeks or months.
2. Contaminants and impurities
On the black market cannabis can be contaminated with pesticides, heavy metals, moulds or synthetic cannabinoids, with no way for the consumer to tell. In recent years adulterated flowers, or flowers sprayed with highly potent synthetic compounds, have been found in Europe repeatedly and have caused poisonings.
Pharmaceutical cannabis flowers are subject to the rules for medicinal products. They are tested for
- pesticides
- heavy metals
- microbial load (e.g. moulds)
- aflatoxins
and must meet limits that are checked regularly using methods recognised by Swissmedic.
3. Standardisation and reproducibility
A therapy only works if the next dose matches the previous one. Pharmacy cannabis comes from GMP production (Good Manufacturing Practice). The same strain has the same key values in the next pack.
That isn’t the case for street product. Even if the “strain” carries the same name, the active-substance content can differ markedly, making dosing and the course of a therapy hard to predict.
4. Medical and pharmaceutical advice
With a prescription, patients have access to a physician and a pharmacy who advise on use: route of administration (inhalation via vaporiser, oily solution), titration, interactions with other medications, and risks in specific life situations.
That advice is entirely absent from the black market. Interactions with antidepressants, anticoagulants or antiepileptics can be easily overlooked.
5. Legal certainty
Since the law change in October 2022, medical cannabis can be prescribed in Switzerland without special authorisation. Patients who source it on prescription move in a clearly defined legal frame: legal possession within the scope of the prescription, documented supply, clear lines of responsibility.
Street cannabis remains illegal. Consumption, possession and acquisition are, depending on quantity, an offence ranging from a contravention to a misdemeanour, with corresponding consequences for criminal record, driving licence and insurance.
In short
| Aspect | Street cannabis | Pharmacy cannabis |
|---|---|---|
| Active-substance content | unknown, fluctuating | declared and tested |
| Contaminants | uncontrolled | within limits |
| Standardisation | none | GMP-compliant |
| Advice | none | physician and pharmacy |
| Legal status | illegal | by prescription, legal |
This article is general information and does not replace medical advice. If you are considering a cannabis-based therapy, please speak with a physician from our directory.
Sources
- Cannabis, facts and figures (synthetic cannabinoids, contaminants) · Addiction Switzerland
- Cannabis, legal framework (NarcA, 10-gram rule, fine) · Addiction Switzerland
- Addiction and health: cannabis · Federal Office of Public Health FOPH
- Current legal status of hemp and cannabis products · Federal Office of Public Health FOPH
- Information sheet, cannabis for medical purposes (GMP requirements) · Swissmedic
- Cannabis for medical purposes, Swissmedic Visible Nov 2022 · Swissmedic