'triptans' used in migraine are serotonin agonists/antagonists ??

they are 5HT1b/1d agonists.
the only other 5HT agonists are,
5HT4 agonists like cisapride,renzapride.

Nb. 'triptans' are C/I in persons with prev. h/o MI or peripheral vascular d/s as the cause vasoconstriction of vessels.