Signature Cabergoline 0.5mg 4 Tabs – Caber – Dostinex

Cabergoline 0.5mg is a dopamine D2 receptor agonist that suppresses prolactin levels, making it an essential ancillary for any cycle containing 19-nor compounds (Trenbolone or Nandrolone/Deca). Elevated prolactin is responsible for some of the most frustrating side effects in bodybuilding: erectile dysfunction (“Deca dick” or “Tren dick”), reduced libido, nipple lactation, mood disruption, and lethargy. Standard aromatase inhibitors like Arimidex and Aromasin do not address prolactin. Cabergoline is the targeted solution.

Why 19-Nor Compounds Raise Prolactin

Trenbolone and Nandrolone (Deca-Durabolin, NPP) are classified as 19-nortestosterone derivatives. Their chemical structure causes progestogenic activity, which stimulates the pituitary gland to produce excess prolactin. At normal physiological levels, prolactin is harmless. At the elevated levels caused by 19-nor steroid use, it directly impairs erectile function, kills libido, and can cause visible nipple discharge. These effects occur independently of oestrogen, which is why blocking oestrogen with an AI does nothing to resolve them.

Cabergoline works by stimulating dopamine D2 receptors in the pituitary, which directly suppresses prolactin secretion. Its exceptionally long half-life of 63-69 hours means that twice-weekly dosing maintains stable prolactin suppression throughout a Trenbolone or Nandrolone cycle.

Suggested Protocol

• Preventive (during Tren or Deca cycle): 0.25mg twice per week (e.g., Monday and Thursday)
• Reactive (prolactin symptoms already present): 0.5mg twice per week until symptoms resolve, then reduce to preventive dose
• Duration: throughout the 19-nor cycle and for 2-3 weeks after the last injection (prolactin can remain elevated while the compound clears)
• Take with food to reduce the mild nausea that some users experience with the first 1-2 doses

When You Do NOT Need Cabergoline

Cabergoline is only necessary when running 19-nor compounds. If your cycle consists of Testosterone, Dianabol, Anavar, Winstrol, Masteron, Boldenone, or any other non-19-nor steroid, prolactin will not be elevated and Cabergoline is unnecessary. For oestrogen control on these compounds, use Aromasin or Arimidex instead.

Cabergoline vs Pramipexole

• Cabergoline (this product): longer half-life (63-69 hours), twice-weekly dosing, fewer side effects, more widely available. The standard choice for prolactin management in bodybuilding
• Pramipexole: shorter half-life (8-12 hours), daily dosing required, stronger dopaminergic effects (can cause compulsive behaviours at higher doses). Less commonly used

Side Effects

• Nausea: mild, typically first dose only. Taking with food eliminates it for most users
• Dizziness or lightheadedness: possible when standing quickly. Mild and transient
• Improved mood and motivation: dopamine agonism can produce a subtle mood lift. This is generally considered a positive effect
• Reduced refractory period: dopamine agonism shortens the recovery time between orgasms. Widely reported

Key Facts

• Active ingredient: Cabergoline 0.5mg per tablet
• Class: Dopamine D2 receptor agonist
• Half-life: 63-69 hours (very long acting)
• Use with: Trenbolone (all esters), Nandrolone Decanoate (Deca), NPP
• Not for: oestrogen control. Use Aromasin or Arimidex for that
• Storage: room temperature, away from moisture and light

For a full breakdown of cycle side effects by compound, read our Steroid Side Effects Guide. For PCT after Tren or Deca cycles, see our PCT Guide.