Metergoline is a psychoactive drug of the ergoline chemical class which acts as a ligand for various serotonin and dopamine receptors.Morning glory: Argyreia nervosa (Hawaiian Baby Woodrose), Ipomoea spp.(Morning Glory, Tlitliltzin, Badoh Negro), Rivea corymbosa (Coaxihuitl, Ololiúqui) Metergoline is a psychoactive drug of the ergoline chemical class which acts as a ligand for various serotonin and dopamine receptors.