Caberlin contains an active drug called Cabergoline. It belongs to a category of medicines called dopamine inhibitors. All the drugs belonging to this class show similar results. Dopamine is a neurotransmitter that helps to control prolactin production. High levels of dopamine help to control prolactin levels. Cabergoline is the active component that works by binding dopamine receptors in the CNS and helps inhibit excess prolactin secretion.