Selexipag and its active metabolite do not inhibit cytochrome P450 enzymes at clinically relevant concentrations. Selexipag and its active metabolite do not inhibit transport proteins. Selexipag and its active metabolite are not expected to induce cytochrome P450 enzymes in the liver and kidney at clinically relevant concentrations. In vitro data indicate that selexipag could be an inducer of both CYP3A4 and CYP2C9 in the intestine.