Felodipine blocks L-type Ca2+ currents in Xenopus oocytes. Superimposed current traces of L-type channels (CaV1.2+a2d1+ß1a), before and during applications of 1 and 10 µM Felodipine (ab141797) as indicated on the left. Holding potential was -100 mV and currents were elicited every 10 seconds by 100 ms steps to +10 mV.