Renin inhibition with aliskiren provides additive antihypertensive efficacy when used in combination with hydrochlorothiazide.
Villamil A, Chrysant SG, Calhoun D, Schober B, Hsu H, Matrisciano-Dimichino L, Zhang J. Renin inhibition with aliskiren provides additive antihypertensive efficacy when used in combination with hydrochlorothiazide. J Hypertens. 2007 Jan; 25(1):217-26.