Actelion's research focuses on the design and synthesis of novel low molecular weight drug-like molecules. Experience has shown that small molecules generally lend themselves to easier formulation, have a broader array of dosage forms, have greater potential for bioavailability, in particular after oral administration, and are more efficiently manufactured.
While Actelion’s medicinal chemistry and high-throughput chemistry groups synthesize smaller quantities of structurally diverse molecules, process research chemists prepare the quantities of selected compounds needed for further studies.

The target profile for Actelion's compounds:

- Orally available
- Targeting newly discovered mechanisms involved in chronic diseases
- Highly target specific to:
o Maximize efficacy
o Minimize side-effect profile
