High prolactin, or hyperprolactinemia, is most often treated with medication that lowers prolactin by mimicking dopamine, the brain chemical that naturally keeps prolactin in check. Normal prolactin levels fall below 20 ng/mL in men and below 25 ng/mL in non-pregnant women. Before starting any treatment, though, the first step is figuring out what’s driving the elevation, because the right approach depends entirely on the cause.
Identifying the Cause Comes First
Prolactin can rise for several reasons, and treatment only works when it targets the right one. The three main categories are a prolactin-producing pituitary tumor (prolactinoma), a medication side effect, or an underlying medical condition like hypothyroidism.
Prolactinomas are the most common cause of persistently elevated prolactin. These are benign pituitary tumors, classified as microprolactinomas (under 10 mm) or macroprolactinomas (10 mm or larger). Prolactin levels often correlate with tumor size: very high readings, above 200 ng/mL, usually point to a larger tumor.
A long list of medications can also push prolactin up. Antipsychotics are the most frequent culprits, especially older “typical” antipsychotics like haloperidol and chlorpromazine, along with the newer drug risperidone. Antidepressants with serotonin activity (SSRIs like sertraline, fluoxetine, and paroxetine, plus some tricyclics and MAO inhibitors) can do it too. Beyond psychiatric medications, anti-nausea drugs like metoclopramide, certain blood pressure medications like verapamil, opiates, acid-reducing H2 blockers like ranitidine, and estrogen-containing medications all appear on the list. If a medication is the cause, switching to an alternative that doesn’t raise prolactin is often the simplest fix.
Hypothyroidism is another treatable cause. When your thyroid is underactive, your brain releases more of a hormone called TRH to try to stimulate it. TRH also stimulates prolactin release as a side effect. Treating the low thyroid with thyroid hormone replacement brings prolactin back down on its own, no additional medication needed.
Dopamine Agonist Medication
For prolactinomas and cases where no reversible cause is found, dopamine agonist medications are the standard first-line treatment. These drugs work by activating dopamine receptors on prolactin-producing cells, which tells them to stop releasing prolactin and, in the case of tumors, causes the tumor to shrink.
Two medications dominate this category: cabergoline and bromocriptine. A systematic review of randomized controlled trials found cabergoline significantly outperforms bromocriptine at normalizing prolactin levels, restoring regular menstrual cycles, and triggering ovulation. Cabergoline also causes fewer side effects. For these reasons, cabergoline is recommended as the first-choice treatment for most people with prolactinomas or other hyperprolactinemic conditions.
Cabergoline is typically started at 0.25 to 0.5 mg per week, taken with food just before bedtime to reduce nausea. Bromocriptine starts at 1.25 mg per day. Both are gradually increased based on prolactin levels and how well you tolerate them. The most common side effects include nausea, dizziness, and fatigue, which tend to improve over time and are generally milder with cabergoline.
Heart Valve Monitoring
At the doses used for prolactinomas, cabergoline carries a low but real concern about heart valve changes over the long term. Current expert recommendations suggest a clinical heart exam for people on cabergoline, with an echocardiogram reserved for specific situations: if a heart murmur is detected, if you’ve been on more than 3 mg per week for over five years, or if you’re continuing the medication past age 50.
When Medication Can Be Stopped
Dopamine agonists don’t always need to be lifelong. After at least two years of treatment with normal prolactin levels and significant tumor shrinkage on imaging, a trial withdrawal can be considered. Only about 26% of treated patients actually reach the conditions needed for a withdrawal attempt, reflecting how specific the criteria are.
Among those who do try stopping, roughly 45% maintain normal prolactin levels afterward. The odds are better with smaller tumors: about 55% of people with microprolactinomas stay in remission compared to 43% with macroprolactinomas. Women fare better than men. In one study, 63% of men experienced a recurrence versus 32% of women. Most recurrences happen quickly. About 91% show up within the first year, with a median time to relapse of just three months. This means close monitoring with repeat blood work is essential in the months after stopping.
Surgery for Prolactinomas
Surgery is not the first option for most prolactinomas, but it becomes relevant in specific circumstances. As a first-line treatment, it’s reserved for emergencies like pituitary apoplexy (sudden bleeding into the tumor) with acute vision loss, or rapidly worsening visual problems from a tumor pressing on the optic nerves.
More commonly, surgery enters the picture when medication fails. In one surgical case series, 70% of patients who underwent surgery had failed medical therapy. About half of those couldn’t tolerate the side effects, and the other half simply didn’t respond well enough, with prolactin staying elevated or the tumor continuing to grow. Some patients also opt for surgery because they prefer it over long-term medication.
The procedure is transsphenoidal surgery, performed through the nose and sinuses to reach the pituitary gland without opening the skull. Success rates depend heavily on tumor size and the surgeon’s experience. For small, well-contained tumors, surgical cure rates are high. For larger or invasive tumors, surgery is less likely to be curative on its own and may need to be followed by continued medication.
Managing Prolactin During Pregnancy
High prolactin frequently comes up in the context of fertility, since elevated levels interfere with ovulation. Many people with prolactinomas conceive successfully on dopamine agonist therapy once their cycles normalize. The key question then becomes what to do with the medication once pregnant.
Guidelines recommend stopping dopamine agonists as soon as pregnancy is confirmed, with one exception: women with large, invasive macroprolactinomas that are close to the optic nerves may need to continue. For microprolactinomas, the risk of meaningful tumor growth during pregnancy is very low, making it safe to pause treatment.
Safety data for both medications during early pregnancy is reassuring. Among over 6,300 pregnancies exposed to bromocriptine, the rate of spontaneous miscarriage was 9.9%, no higher than the 10.9% rate in the general population, and there was no increase in birth defects or ectopic pregnancies. Follow-up studies of children exposed to bromocriptine in utero showed normal physical and psychological development up to 9 years. Cabergoline data, while drawn from fewer pregnancies, tells a similar story. A review of over 800 pregnancies with cabergoline exposure found no significant difference in miscarriage, premature delivery, or malformations, and 12-year follow-up of the children showed no developmental concerns.
During pregnancy, you should report any severe headaches or changes in vision promptly, as these could signal tumor growth. If significant enlargement occurs, bromocriptine is the preferred medication to restart because it has the longest safety track record in pregnancy.
Vitamin B6 as a Complementary Approach
For people whose high prolactin is caused by antipsychotic medications, vitamin B6 has shown surprisingly strong results in clinical research. B6 supports dopamine production in the brain, which counteracts the prolactin-raising effect of antipsychotics.
In a randomized, double-blind study of 200 patients with antipsychotic-induced high prolactin, those given 600 mg of B6 daily for 16 weeks saw a 68.1% drop in prolactin levels, from an average of 95.5 down to 30.4 μg/L. A comparison group given a different medication saw only a 37.4% reduction. The B6 effect was also durable: while the comparison treatment plateaued after four weeks, B6 continued working throughout the study period.
This is a specific context, though. The evidence applies to prolactin elevation caused by antipsychotics, not to prolactinomas or other causes. And 600 mg daily is a high dose of B6 that can cause nerve damage with prolonged use, so this isn’t something to try without medical guidance.