Any delay or disruption to the supply of a notifiable medicinal product must be reported by the manufacturer (i.e. the holder of the relevant licence). A list of the current shortages of medicinal products can be found on the FONES website: Current shortages (admin.ch).
The Therapeutic Products Division of the National Economic Supply publishes annual reports (with statistics) on disruptions to medicinal product supplies as well as background information on the supply situation. Published reports up to and including 2022 can be found (in German) at: FONES reports (admin.ch).
In addition to the monitoring conducted by the Swiss Confederation, there is also the privately-run «drugshortage.ch» website. The data provided here go beyond the legal mandate of the National Economic Supply and cover a wider range of products. Since this is a private undertaking, however, no guarantee can be given as to the completeness or the accuracy of the information provided.