Lower numbers = closer to natural. Higher numbers = more enhanced.
Why this rating?
Per FDA prescribing information, cabergoline is a dopamine D2 agonist that controls prolactin levels, normalizing prolactin in 86-92% of patients. It is used to manage side effects from 19-nor steroids (trenbolone, nandrolone), not to enhance performance itself. FDA-approved for hyperprolactinemia. Does not build muscle or enhance athletic performance. Any testosterone/libido "restoration" it produces is only reversing prolactin-driven suppression caused by other compounds, not raising hormones beyond a natural baseline. Rated 1 - basically natty, organ-support medication for hormonal side effect management with no independent effect on the muscular/physique ceiling.
Overview
A potent dopamine D2 receptor agonist (ergot derivative) used to control elevated prolactin levels. Essential ancillary during cycles containing 19-nor steroids (trenbolone, nandrolone) which elevate prolactin. Known for its exceptionally long half-life allowing twice-weekly dosing and its superior tolerability compared to bromocriptine.
Important Warnings
- •Do not use with dopamine antagonists (metoclopramide, antipsychotics) - blocks effects
- •Cardiac valve risk is dose-dependent - keep doses at minimum effective
- •Baseline echocardiogram recommended for long-term use
- •Can unmask psychotic tendencies in predisposed individuals
- •Monitor for impulse control disorders (gambling, compulsive behaviors)
- •Do not abruptly discontinue after long-term use
- •Get prolactin bloodwork to confirm need and monitor effectiveness
Purpose & Use Cases
Prolactin Control During 19-Nor Cycles
Essential for controlling prolactin elevation caused by trenbolone, nandrolone (deca), and other progestogenic compounds.
Sexual Function Restoration
Restores libido, erectile function, and gonadal function suppressed by hyperprolactinemia. Clinical studies (e.g., De Rosa et al.) document significant improvement in sexual potency and testosterone status within months of treatment.
Gynecomastia Prevention
Prevents prolactin-induced gynecomastia which can occur independently of estrogen-related gyno.
Refractory Period Reduction
Commonly reported to reduce male refractory period after orgasm due to prolactin suppression.
Benefits
- Normalizes prolactin in 86-92% of patients (Verhelst 1999, 455-patient study)
- Exceptionally long half-life allows twice-weekly dosing
- Superior tolerability vs bromocriptine (fewer GI side effects)
- Effects begin within 3 hours, last up to 7 days
- Restores libido and sexual function suppressed by high prolactin
- Prevents prolactin-induced gynecomastia
- Can restore testosterone levels suppressed by hyperprolactinemia
- Does not require daily dosing - convenient 2x/week schedule
Good to Know
It is for PROLACTIN, not estrogen
Cabergoline is a dopamine D2 agonist, dopamine tonically suppresses prolactin, so caber fixes prolactin-driven problems: 19-nor "deca/tren dick", prolactin-induced gyno and low libido. It does NOTHING for estrogen gyno, water retention or high E2, that is the job of an AI or SERM. Reaching for caber to fix an estrogen problem is a classic mistake.
Really only needed with 19-nors
Trenbolone and nandrolone are progestogenic and push prolactin up; caber is the classic pairing (start ~2 weeks before the 19-nor). Testosterone-only or DHT-derivative cycles rarely raise prolactin enough to need it, confirm with bloodwork rather than running it by default.
Caber vs prami: the trade-off
Cabergoline is ergot-derived, extremely long-acting (twice-weekly dosing) and more potent/convenient for prolactin, but carries a dose-dependent 5-HT2B cardiac-valve fibrosis risk. That risk is a genuine concern only at the multi-mg/DAY Parkinson's doses, bodybuilding doses (0.25-0.5mg twice weekly) are far below that. Pramipexole is the non-ergot alternative (no valve risk) but is daily, less potent, and has higher impulse-control-disorder risk.
Do not crash prolactin either
Some prolactin is needed for normal libido and mood; over-suppressing it causes its own low-libido and sexual dysfunction. Dose to labs, aim for mid-normal prolactin, and get bloodwork to confirm you actually need it.
Dosage Guidelines
| Experience Level | Dosage Range |
|---|---|
| Beginner | 0.5 – 1 mg/week |
| Intermediate | 1 – 1.5 mg/week |
| Advanced | 1.5 – 2 mg/week |
FDA-approved titration for hyperprolactinemia: start at 0.25mg twice weekly (0.5mg/week total), increase by 0.25mg twice weekly at intervals of at least 4 weeks per prolactin bloodwork, up to the FDA-approved maximum of 1mg twice weekly (2mg/week total). In PED use, begin ~2 weeks before starting 19-nor compounds (trenbolone, nandrolone) and continue throughout the cycle; going beyond the 2mg/week ceiling is off-label and not typical practice. Tablets are typically scored 0.5mg - split accordingly.
Side Effects
Nausea
commonReported in 27% of users. Most common side effect.
Take with food. Usually improves with continued use. Start with lower dose.
Headache
commonReported in 26% of users.
Usually transient. Standard pain relievers if needed.
Dizziness/Vertigo
commonReported in ~15% of users in placebo-controlled trials. Related to dopaminergic effects.
Rise slowly from sitting/lying positions. Avoid operating machinery initially.
Orthostatic Hypotension
uncommonBlood pressure drop when standing. Risk increases with doses >1mg initially.
Start with low dose. Rise slowly from supine/sitting positions.
Cardiac Valvulopathy
rareActivation of 5-HT2B receptors can cause valve fibrosis, most strongly linked to HIGH doses (>2mg/day, as used off-label in Parkinsons - cabergoline is not FDA-approved for Parkinsons). FDA labeling notes rare cases have also been reported at lower hyperprolactinemia doses (0.5-2mg/week), so risk is not zero at bodybuilding doses, but is far lower than at Parkinsons-level daily dosing.
Keep doses at minimum effective. Baseline echocardiogram recommended before starting and for long-term use. Risk is dose-dependent - bodybuilding weekly totals are far below the daily Parkinsons doses linked to most reported cases.
Impulse Control Disorders
rareDopamine agonists can cause compulsive gambling, eating, shopping, or sexual urges in susceptible individuals.
Monitor for behavioral changes. Discontinue if problematic impulse control develops.
Fatigue
uncommonSome users report tiredness, particularly initially.
Usually transient. Take evening dose if daytime fatigue is problematic.
General Mitigation Strategies
At bodybuilding doses (0.5-2mg/week), cabergoline is generally well-tolerated. The cardiac valve risk that caused concern in Parkinsons patients (doses >2mg DAILY) is much lower at typical PED support doses, though FDA labeling notes rare cases even at hyperprolactinemia doses. Take with food to reduce nausea. Start at minimum dose and titrate based on bloodwork. Only ~4% (3.9%) discontinuation rate due to adverse effects in the Verhelst 1999 455-patient study.
Post Cycle Therapy (PCT)
Cabergoline is an ancillary compound used during cycle, not a PCT drug. It does not affect the HPT axis directly. Continue use during PCT if prolactin is still elevated. Can be discontinued once prolactin normalizes.
How It Works
Cabergoline mimics dopamine by binding to D2 receptors on lactotroph cells in the anterior pituitary, directly inhibiting prolactin secretion. Activation of D2 receptors leads to inhibition of adenylyl cyclase activity and decreased intracellular calcium. Also has affinity for D3, D4, and various serotonin receptors (5-HT1A, 5-HT2A, 5-HT2B, 5-HT2C). Prolactin suppression begins within 3 hours of dosing, with effects lasting up to 7 days.
Fundamentals
Reference on the practices relevant to Cabergoline: how they are done and where they go wrong. Not a recommendation to use it.
Common Stacks
- Essential with Trenbolone cycles - start 2 weeks before tren
- Essential with Nandrolone/Deca cycles
- Cabergoline + AI (anastrozole/exemestane) for complete E2/prolactin control
- Can be combined with P5P (Vitamin B6) for additional prolactin support
Legal Status
Prescription medication. FDA-approved for hyperprolactinemia. Not a controlled substance.
Legal status varies by country and changes over time. This is a general summary, not legal advice.
WADA Status
Cabergoline is not currently listed on the WADA Prohibited List. It is a dopamine agonist used for prolactin control.