The concomitant use of erythromycin may increase bromocriptine plasma levels.
Domperidone, a dopamine antagonist, may cause increases in serum prolactin. In so doing, domperidone may antagonize the therapeutically-relevant prolactin lowering effect of bromocriptine. It is possible that the anti-tumourigenic effect of bromocriptine in patients with prolactinomas may be partially blocked by domperidone administration.