the effects of the calcium entry blockers nifedipine , ( - ) -verapamil and the dihydropyridine derivative py 108-068 were evaluated on the increase in diastolic pressure of pithed normotensive rats caused by the selective alpha 1-adrenoceptor agonists cirazoline , ( - ) -phenylephrine , ( +/- ) -erythro-methoxamine , ( - ) -amidephrine and st 587 [ ( 2-chloro-5-trifluoromethylphenylimino ) -2-imidazolidine ] as well as by the mixed alpha 1/alpha 2-adrenoceptor agonists clonidine and dpi [ ( 3,4-dihydroxyphenylimino ) -2-imidazolidine ] .
C0028066
nifedipine
C0012315
dihydropyridine