What Is Bromocriptine? Uses, Dosage, and What You Need to Know in 2026

Bromocriptine is one of medicine's most versatile drugs. A single molecule approved for four different conditions — ranging from Parkinson's disease to type 2 diabetes — it has been in clinical use since 1975. Here is everything you need to know about what it is, how it works, and whether it might be right for you.

What Is Bromocriptine?

Bromocriptine is an ergot-derived dopamine receptor agonist — meaning it mimics the action of dopamine in the body by binding to dopamine receptors. It was first patented in 1968 and approved for medical use by the FDA in 1975.

It is sold under two main brand names in the United States:

Parlodel — the original formulation, available as 2.5 mg tablets and 5 mg capsules; generic versions are widely available

Cycloset — a quick-release formulation (0.8 mg) approved in 2009 specifically for type 2 diabetes; no generic currently available

What Is Bromocriptine Used For?

Bromocriptine has four FDA-approved indications:

Hyperprolactinemia — abnormally high levels of the hormone prolactin in the blood. Causes include pituitary adenomas (prolactinomas), antipsychotic medications, and other factors. Bromocriptine lowers prolactin levels and can shrink prolactinomas, restoring menstrual cycles, fertility, and sexual function.

Parkinson's Disease — Parkinson's involves the loss of dopamine-producing neurons. Bromocriptine directly stimulates dopamine receptors in the brain, helping manage movement symptoms. Today it is rarely first-line (non-ergot dopamine agonists are preferred) but remains used in select patients.

Acromegaly — a condition caused by excess growth hormone, often from a pituitary tumor. Bromocriptine can help suppress GH levels, though somatostatin analogs are generally preferred today.

Type 2 Diabetes (Cycloset only) — Cycloset is an add-on treatment that helps improve post-meal blood sugar control through a dopamine-mediated mechanism. It is used alongside diet, exercise, and other diabetes medications.

Bromocriptine Dosage Overview

Dosage varies significantly by indication — do not adjust your dose without guidance from your prescriber:

Hyperprolactinemia (Parlodel): Starting dose typically 1.25-2.5 mg per day; titrated to a usual range of 2.5-15 mg per day

Parkinson's Disease (Parlodel): 2.5-5 mg two to three times per day; up to 45 mg per day in some patients

Type 2 Diabetes (Cycloset): Starting dose 0.8 mg once daily within 2 hours of waking; increase by 0.8 mg per week; maximum 4.8 mg (6 tablets) per day

How to Take Bromocriptine

Always take with food to reduce nausea

Cycloset must be taken within 2 hours of waking — timing is critical for its effectiveness in diabetes

Parlodel for acromegaly and hyperprolactinemia is often taken at bedtime to minimize nausea

Store at room temperature (68-77°F), away from heat and moisture

Is Bromocriptine a Controlled Substance?

No. Bromocriptine is not a DEA-scheduled controlled substance. This means it can be prescribed electronically or via fax, filled with more flexibility than controlled substances, and does not require the additional documentation required for Schedule II or III medications.

Want to understand the science behind how bromocriptine works? Read our guide on bromocriptine's mechanism of action. And if you're having trouble finding it at your pharmacy, medfinder can help you locate it in stock near you.