Prolactin and Fertility: What You Need to Know
“Why is my body not listening to me?” If you’re reading this, you may be asking yourself this exact question, cycling between hope and heartbreak every month. You might have heard the word “prolactin” tossed around in blood test results or hurried doctor visits, but what does it really mean for your fertility? Let’s talk about it—openly, honestly, and with the calm, no-nonsense clarity you deserve.
At Malpani Infertility Clinic, we understand the confusion and frustration that comes with hormonal imbalances. If your prolactin levels are high, it can feel like yet another hurdle in your journey to parenthood. But here’s the reality: of all the causes of infertility, elevated prolactin is one of the most treatable. You are not alone, and you do have options.
What Is Prolactin and Why Does It Matter?
Prolactin is a hormone made by your pituitary gland, a tiny structure at the base of your brain. While it’s best known for its role in preparing the body for breastfeeding, prolactin is involved in many other processes—including how your reproductive system works.
Think of prolactin as your body’s signal to pause baby-making after childbirth. It ramps up during pregnancy and breastfeeding to prepare for milk production. But sometimes, it goes into overdrive when you’re not pregnant or nursing, leading to problems with ovulation and fertility.
How Prolactin Affects Ovulation and Your Fertility
Here’s what often goes unspoken: prolactin does more than prep your body for breastfeeding. When it’s too high, it quietly disrupts your entire reproductive system. Women who are breastfeeding rarely ovulate—that’s prolactin at work. If your levels are elevated, your body might “think” you’re supposed to be preventing another pregnancy.
High prolactin quietly blocks the very hormones you need to ovulate—without ovulation, pregnancy simply can’t happen.
Specifically, high prolactin interferes with:
- Follicle-stimulating hormone (FSH): helps eggs mature in your ovaries.
- Gonadotropin-releasing hormone (GnRH): triggers the release of both FSH and LH (luteinizing hormone), which start ovulation.
If prolactin is high (a condition called hyperprolactinemia), you may not ovulate at all. Sometimes, your periods become irregular, lighter, or vanish completely. For some, the only sign is a stubborn inability to conceive—month after month, year after year.
What’s Considered a Normal Prolactin Level?
Understanding your blood test can be overwhelming, so let’s keep it simple. Most labs use ng/mL (nanograms per milliliter) as the unit.
- Men: 2 to 18 ng/mL
- Non-pregnant women: 2 to 29 ng/mL
- Pregnant women: 10 to 209 ng/mL
If your report uses pmol/L, multiply your ng/mL value by 44. For women, a normal result is less than 700 pmol/L.
Low prolactin rarely matters. It’s high prolactin that can throw your fertility off track.
What Does It Mean If My Prolactin Is High?
If you’ve seen a result above the normal range, it’s natural to worry. But here’s what many doctors won’t tell you: one high reading is not a diagnosis. Getting blood drawn, being anxious before the test, or even physical stress can cause a temporary spike.
- Always repeat the test if your first result is high.
- Slightly elevated results are often harmless, especially if you have no symptoms.
- Women with PCOD or PCOS often show mildly higher prolactin too.
If your prolactin is above 100 ng/mL, your doctor may check for a pituitary tumor (usually a small, non-cancerous one called a microadenoma). This sounds scarier than it is—these are almost always treatable with medication.
Symptoms of High Prolactin: What Should You Watch For?
Many people have no symptoms at all, but some might notice:
- Missed or irregular periods
- Difficulty getting pregnant
- Milky nipple discharge (galactorrhea), even if never pregnant or breastfeeding
- Reduced sex drive or vaginal dryness
- Headaches or changes in vision (if caused by a larger pituitary tumor)
Often, the only real sign is ongoing infertility. If you’re doing “everything right” and still not conceiving, don’t ignore this possibility.
High Prolactin in Men: It Matters More Than You Think
Yes, men can have high prolactin too. It’s less common but can cause:
- No sperm (azoospermia) or low sperm counts
- Reduced sex drive
- Erectile dysfunction
- Breast tenderness or even breast growth
Even for men, these problems often resolve when prolactin is brought back under control.
What Causes High Prolactin?
When your prolactin is consistently high, your doctor will look for the root cause. The main triggers include:
- Prolactinoma: A small, benign tumor in the pituitary gland. Most are tiny and respond well to medication, but larger ones can cause headaches or vision changes.
- Prescription medications: Some antidepressants, painkillers, and certain blood pressure drugs block dopamine (the hormone that normally keeps prolactin in check).
- Other medical conditions: An underactive thyroid (hypothyroidism) is a common culprit.
- “Idiopathic” cases: Sometimes, no clear cause is found. This does not mean it cannot be treated.
When Should You Get Prolactin Checked?
You might need this test if you have:
- Irregular or missing periods
- Trouble getting pregnant
- Unexplained milky nipple discharge
- Loss of bone density
- Low sex drive or erectile problems (for men)
- Breast tenderness or growth (for men)
- Unexplained headaches or vision problems
The test can be done any day of your cycle. Prolactin is highest in the morning, so if your first test is high, it’s smart to repeat it later in the day.
Treating High Prolactin: What Works and What Doesn’t
The good news: most cases respond beautifully to treatment. Here’s what works:
- If your prolactin is only slightly high and you have no symptoms, you may not need any treatment.
- If you have hypothyroidism or PCOS, treating those conditions often brings prolactin back to normal.
- If a medication is the cause, stopping or switching the drug may solve the problem (always consult your doctor first).
If you need medication to lower prolactin, there are two main options:
- Bromocriptine: Lowers prolactin and restores normal ovulation. Start with 2.5 to 5 mg at bedtime. Side effects like nausea and dizziness are common at first, but starting low and increasing slowly helps. Bromocriptine only works while you take it. Once you conceive, you can stop.
- Cabergoline: This is better tolerated for many people. One tablet (0.5 mg) per week is typical, with dose adjustments as needed. Fewer side effects than bromocriptine.
Medication is rarely needed forever—just until you get pregnant or your doctor says otherwise.
For most people, prolactin levels return to normal within a week or two of starting medication. Regular cycles and ovulation often follow soon after.
What to Expect After Treatment
If high prolactin was the main reason for your infertility, your periods should become regular again, and your chances of pregnancy are excellent. At Malpani Clinic, we’ve seen countless couples succeed once this simple but crucial problem is addressed.
Don’t Let Confusion or Fear Hold You Back
Hormonal imbalances can feel mysterious and isolating, especially when your body isn’t cooperating and everyone around you seems to get pregnant effortlessly. But the reality is, you’re not alone—and you don’t have to become a hormone expert overnight.
If you’ve been told your prolactin is high, or you’re lost in a maze of lab results, remember: one test does not define your story. What matters is finding the cause and choosing the right solution for you. That’s where honest, evidence-based, and compassionate advice makes all the difference.
At Malpani Infertility Clinic, we believe in empowering you with all the information—not just the easy answers. If you have questions, doubts, or want to make sure you’re not missing anything, we’re here to help you make the best decisions for your future family.
If you live in the USA, you can check your prolactin levels yourself at MyMedLab.
Frequently Asked Questions
Q: How does high prolactin make it hard to get pregnant?
A: Elevated prolactin blocks hormones like FSH and GnRH that are essential for ovulation. Without ovulation, there is no egg to fertilize, which means pregnancy cannot happen.
Q: Can stress cause my prolactin test to be high?
A: Yes. Stress, exercise, eating, or even the anxiety of a blood test can temporarily raise prolactin. That’s why a single high reading should always be repeated before making any decisions.
Q: How quickly does medication lower prolactin?
A: Most people see results within a week or two of starting bromocriptine or cabergoline. Your doctor will retest your blood to confirm the medication is working.
Q: Will I need to keep taking prolactin medication forever?
A: Usually not. You’ll take it until you conceive, or until your doctor feels it’s safe to stop. If you’re not trying for a baby, your doctor will discuss long-term options if needed.
Q: Can men have fertility issues because of high prolactin?
A: Yes. In men, high prolactin can lead to low sperm counts, erectile dysfunction, and low sex drive. The same medications used in women work very well for men too.
Q: Is a pituitary tumor always the cause of high prolactin?
A: No. While a benign pituitary tumor is one cause, medications and other medical conditions like hypothyroidism can also raise prolactin.
Q: What if my prolactin is only slightly high?
A: Slightly elevated prolactin with no symptoms often does not need treatment. Your doctor will look at your whole fertility profile before deciding next steps.