title: The effect of prazosin of pre- and post-synaptic alpha-receptors in the pithed rat.
abstract: 1. Prazosin had a marked inhibitory effect on post-synaptic alpha-receptors in the pithed rat, as measured by the blood pressure response to the cumulative administration of clonidine. 2. Prazosin had no inhibitory effect, however, on the pre-synaptic alpha-receptor, as measured by the clonidine-induced reduction in the tachycardia produced by stimulation of the cardiac nerves. 3. These results suggest that prazosin has a selective antagonistic affinity for post-synaptic alpha-receptors.
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D003000:Clonidine / Q000009:adverse effects / Q000037:antagonists & inhibitors; D003864:Depression, Chemical; D006973:Hypertension / Q000139:chemically induced; D011224:Prazosin / Q000494:pharmacology*; D011799:Quinazolines / Q000494:pharmacology*; D051381:Rats; D011941:Receptors, Adrenergic / Q000378:metabolism*; D011942:Receptors, Adrenergic, alpha / Q000378:metabolism*
chemical_list: D011799:Quinazolines; D011941:Receptors, Adrenergic; D011942:Receptors, Adrenergic, alpha; D003000:Clonidine; D011224:Prazosin