“As measured with the calcium-… probe indo-1, nitrendipine (0.1-10 microM) attenuated inward calcium flux … by bath application of NMDA (100 microM) and glycine (100 microM), in a concentration-dependent (IC50, 0.56 +/- 0.21 microM; 95% confidence interval, 0.19-1.3 microM) and reversible manner.”