the carotid arterial vasoconstrictor action of gr43175 was resistant to antagonism by the 5-ht2 receptor , 5-ht3 receptor and alpha-adrenoceptor blocking drugs , ketanserin , mdl72222 and phentolamine respectively , but could be antagonized by the non-selective 5-ht1-like receptor blocking drug methiothepin .
C0295352
5-ht3 receptor
C0597357
blocking drug