Netarsudil dose-dependent lowering of IOP in rabbits and monkeys. Formulations containing 0.005% (rabbit only), 0.01%, 0.02%, or 0.04% netarsudil were administered once daily (AM) to 1 eye of each animal for 3 days, with the fellow untreated eye serving as the control. IOP was determined for both eyes before test article administration (time 0) and at times 1, 2, 4, 8, and 24 h (rabbits) or 4, 8, and 24 h (monkeys) after each morning dose on Day 1 and 3. (A) Changes in IOP for the treated eye relative to the untreated contralateral eye in Dutch Belted rabbits (n = 10/group). IOP reductions were statistically significant (P < 0.05) at all postdose time points. (B) Change in IOP in the netarsudil-treated eye relative to the untreated contralateral eye in Formosan Rock monkeys (n = 6/group). IOP reductions were statistically significant (P < 0.05) at all postdose time points. IOP, intraocular pressure.