Cabergoline
most data
The Dose Guy’s verdictSep 1, 20263 sources
The right tool when prolactin is the problem. If you are running nandrolone or trenbolone and sexual function goes sideways, or bloodwork shows prolactin climbing, cabergoline drops it reliably and fast. The honest catch: at high or chronic doses it carries a real heart-valve signal, and the dopamine hit makes it tempting to misuse as a libido enhancer. Run it low, run it short, dose to bloodwork, and stop when the 19-nor clears.
What it is
A long-acting dopamine D2 receptor agonist that suppresses prolactin secretion from the pituitary. In medicine it treats prolactinomas, and it works well. In the gym it exists for one reason, the 19-nors. Nandrolone and trenbolone raise prolactin as a side effect, and elevated prolactin causes the sexual dysfunction, the loss of libido, the erectile trouble, and in rare cases the gynecomastia or lactation that give “deca dick” its reputation. Cabergoline is the fix.
The dopamine agonism is also why cabergoline has a shadow use. The community widely reports that it shortens refractory period and enhances sexual function at doses above what prolactin control requires. That is the misuse pattern, chasing the dopamine high rather than treating elevated prolactin, and it is where the risk-reward math falls apart.
What the research shows
Deep clinical data in prolactinomas. The valve signal and the impulse-control signal are both quantified in large analyses:
Realistic protocols
Only start cabergoline if bloodwork confirms elevated prolactin or if unmistakable prolactin symptoms appear on a 19-nor. Running it preventatively “just in case” is not worth the valve exposure. When you do need it, 0.25 mg twice a week is the standard start, both in clinics and in the community. Give it two to three weeks and recheck prolactin. Most people settle between 0.25 and 0.5 mg twice weekly. The duration matches the 19-nor cycle and a short tail after, not indefinitely.
Do not chase the recreational dopamine effect. The libido boost and shortened refractory period that the community reports come from pushing dopamine activity above baseline, and that is exactly the territory where impulse-control issues and cardiac risk start accumulating. If your prolactin is normal and you are using cabergoline for sexual enhancement, you are paying with valve wear for a party trick. If you want the 19-nor without the prolactin sides and without the valve exposure, the simpler move is lowering the nandrolone or trenbolone dose until prolactin stays in range on its own.
Side effects
The prolactin-dose range is usually well tolerated. The trouble starts when doses climb or duration stretches:
