A cell-permeable Ca²⁺ antagonist and vasodilator. Inhibits protein kinase A (Ki = 1.6 uM), protein kinase G (Ki = 1.6 uM), myosin light chain kinase (Ki = 36 uM) and Rho kinase (ROCK; IC₅₀ = 10.7 uM. Fasudil also mobilizes adult neural stem cells in vivo.