reversible ligand competition experiments using solubilized binding sites demonstrated appropriate pharmacologic specificity , with dihydropyridines ( nifedipine = nitrendipine greater than bay k 8644 ) completely displacing binding , verapamil partially displacing binding , and diltiazem enhancing binding , as previously described in membrane preparations .
C0012315
dihydropyridines
C0028066
nifedipine