Abstract
The first drugs to become known as Ca antagonists* were four structurally unrelated substances: verapamil, nifedipine, diltiazem, and perhexiline. The synthesis, pharmacology and initial clinical testing of verapamil as an antianginal agent occurred several years before it was demonstrated to block Ca channels, and a similar sequence was apparently true for nifedipine, diltiazem, and perhexiline (Fleckenstein, 1983; Kendall and Okopski, 1986; Krikler, 1987; Winbury, 1984). Via the use of verapamil (and prenylamine, a weaker, less specific agent), the concept that a dual ionic carrier system existed in mammalian my ocardial fibers (Reuter, 1967; Reuter and Beeler, 1969) was strongly substantiated, and the phenomenon of Ca antagonism was first demonstrated (Fleckenstein et al., 1967, 1969; Fleckenstein, 1983; Kohlhardt et al., 1972). It became clear that, in addition to the well-known “fast” channel for the inward movement of Ca. This slow Ca influx, which was initiated by the action potential spike, acted to trigger the contractile apparatus and thereby linked contraction with membrane excitation in the my ocardium.
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Maxwell, R.A., Eckhardt, S.B. (1990). Calcium Antagonists. In: Drug Discovery. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-4612-0469-5_3
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