Dopamine is a wonderful molecule. We all love it. But forget cabergoline as an agonist for it. I stopped taking it after learning about the heart valve problems that are linked to it's use. Here is one article of many.
http://neurology.jwatch.org/cgi/content/full/2007/130/2
Fortunately there is an easy and natural way to increase dopamine levels that is safe if used appropiately and that is by taking a teaspoon full of an herb powder called kapi-kacchu (velvet bean). It contains a huge amount of l-dopa. No need to go beyond a teaspoon a day according to what I have read and more may not be healthy.