This paper presents our experience in reusing mereology ontologies in a
Pharmaceutical Product ontology, an ontology built by the EU NeOn project. It
shows a set of mereology ontologies implemented in different machine
interpretable languages and analyzes them according to the different types of
mereology identified by Varzi. Then, it describes the specifications of mereology
modeling necessities for Pharmaceutical Product. Finally, it presents the ontology
which fits best with the specifications. One of the results of this work is a
procedure to reuse general (also called common) ontologies
