The use of a first active agent for treating rheumatoid arthritis in a patient in need of such treatment, wherein the first active agent is of formula (I) or a pharmaceutically acceptable salt thereof, wherein said treating comprises administration of an additional active agent, and wherein the additional active agent is cyclosporine A. The compound of formula (I) is (S)-N-(2-(1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)-1,3-dioxoisoindolin-4-yl)acetamide (Apremilast).