Schaer Pharma is owned by the family of Michel Schaer.

1989  Foundation of Tentan AG, Ramlinsburg
1998  Acquisition of OTC Pharma AG
2002  Takeover of Ars Vitae AG
2007 Takeover Kräuter-Pfarrer-Künzle AG
2008  Takeover of Eduard Vogt AG
2008  Construction of a new company building in Itingen, BL
2009  Completion of the company building and relocation (May)
2009  Foundation of Tentan Deutschland GmbH and Tentan Hongkong Ltd.
2009  Renaming from OTC Pharma to Medicoss AG
2010  Foundation of Tentan UK Ltd.
2012  Acquisition of New Care AG
2020  Simplification of the company structure. Ars Vitae AG and Eduard Vogt AG were integrated into the other companies.
2021 The company Kräuter Pfarrer Künzle AG is integrated into the company Tentan AG.