<prompt> Sumatriptan exerts antimigraine action through which receptors?5HT1D1B5 HT25HT35HT4  <response>: Ans. is a i.e., 5HT IDIB Sumatriptan is the first selective 5-HT1D1B receptor agonist; activates other subtypes of 5-HT1 receptors only at very high concentrations, and does not interact with 5-HT2, 5-HT3, 5-HT4-7, a or b adrenergic, dopaminergic, cholinergic or GABA receptors. 