What makes a requirement binding here
The Federal Act on Medicinal Products and Medical Devices (Therapeutic Products Act, TPA), SR 812.21, of 15 December 2000. It rests on Articles 95 paragraph 1 and 118 paragraph 2 of the Federal Constitution, and Article 1 states its purpose as protecting human and animal health and guaranteeing that only high quality, safe and effective therapeutic products are placed on the market. Article 2 sets the scope: the handling of medicinal products and medical devices, narcotics under the Narcotics Act of 3 October 1951 insofar as they are used as therapeutic products, and therapeutic treatments such as gene therapy where they relate directly to therapeutic products.
Through Swiss federal law administered by Swissmedic — the Swiss Agency for Therapeutic Products — which has been a PIC/S Participating Authority since February 1996, among the earliest cohort to join. The TPA is a living instrument rather than a fixed text: the consolidated version carries a status date, so the question to ask of any provision is not what the Act said but what it says as of the status date currently published.