Low-Dose Naltrexone in Perimenopause: What You Should Know
You've worked on your hormones. You're eating better. You're supporting your sleep. Maybe you're even feeling significantly better…
But something still feels off.
The joint aches haven't completely gone away.
Your brain still feels foggy some days.
Fatigue lingers.
Or maybe you have an autoimmune condition that seems to flare whenever your hormones shift.
This is where you may have heard about something called low-dose naltrexone—or LDN.
LDN has been getting a lot more attention in functional and integrative medicine.
But what exactly is it?
And more importantly…
Does it actually have a role in perimenopause?
Let's break it down.
First, What Is Low-Dose Naltrexone?
Naltrexone isn't a new medication.
At standard doses, naltrexone is FDA-approved for the treatment of alcohol use disorder and opioid dependence.
Low-dose naltrexone is different.
When prescribed as LDN, naltrexone is typically used at doses much lower than the standard FDA-approved dose—often somewhere around 1–4.5 mg per day, although dosing is individualized.
Here's the important part:
LDN use for perimenopause symptoms is off-label. That means the FDA has not approved naltrexone specifically for perimenopause, menopause symptoms, autoimmune disease, chronic pain, brain fog, or fatigue. However, some functional and integrative medicine providers use it off-label in carefully selected patients because of its potential effects on pain signaling, immune regulation, and inflammation.
How Does LDN Work?
This is where it gets interesting.
Naltrexone temporarily blocks opioid receptors.
At low doses, researchers believe that this brief blockade may influence the body's own endorphin system and other pathways involved in pain perception, immune activity, and inflammation.
LDN has also been studied for its potential effects on microglia—immune cells within the central nervous system that may play a role in neuroinflammation and chronic pain.
In simple terms:
LDN may help change the way the body processes certain pain and inflammatory signals.
But I don't want to oversimplify this.
We are still learning exactly how LDN works, and the evidence varies significantly depending on the condition being treated.
So Why Are We Talking About LDN During Perimenopause?
Because perimenopause isn't only about hot flashes and periods.
Hormonal changes can influence multiple systems throughout the body.
During this transition, women may notice changes in:
→ Joint and muscle comfort
→ Sleep
→ Mood
→ Energy
→ Cognition
→ Immune symptoms
→ Existing autoimmune conditions
→ Pain sensitivity
And sometimes those symptoms don't completely resolve by addressing hormones alone.
That's when I start asking:
What else is contributing?
Because hormones may be one piece of the puzzle—but they aren't always the entire puzzle.
Symptoms That Deserve a Deeper Look
If a woman is still struggling despite addressing the basics, I don't automatically reach for another medication.
I want to understand why the symptom is still there.
For example:
Persistent Joint or Muscle Pain
Is it hormones?
Inflammation?
An autoimmune condition?
Vitamin D deficiency?
Poor recovery?
Loss of muscle?
Something orthopedic?
Or a combination?
LDN has been studied in several chronic pain and inflammatory conditions, which is why it sometimes enters the conversation for the right patient.
Autoimmune Symptoms
This is one area where LDN gets a lot of attention in functional medicine.
You may hear about it in conversations around conditions such as:
Hashimoto's thyroiditis
Fibromyalgia
Multiple sclerosis
Inflammatory bowel disease
Other chronic inflammatory or autoimmune conditions
However, the strength of evidence is not the same for every condition.
Having Hashimoto's, for example, does not automatically mean you need LDN.
We still need to look at the entire clinical picture.
Brain Fog and Fatigue
Brain fog and fatigue are incredibly common during perimenopause.
But they can also be associated with:
→ Thyroid dysfunction
→ Iron deficiency
→ Vitamin B12 deficiency
→ Vitamin D deficiency
→ Poor sleep
→ Insulin resistance
→ Chronic stress
→ Inflammation
→ Autoimmune disease
→ Medication effects
This is exactly why I don't like treating a symptom without asking what might be driving it.
Before we add LDN, let's make sure we aren't missing something else.
LDN Is NOT Hormone Therapy
This distinction is really important.
LDN does not replace estrogen.
LDN does not replace progesterone.
LDN does not replace testosterone when testosterone therapy is clinically appropriate.
And it does not provide the same effects as menopausal hormone therapy.
They are completely different medications working through different pathways.
For a woman who is an appropriate candidate for hormone therapy, LDN isn't an alternative way to “balance hormones.”
Instead, it may occasionally be considered as an additional tool when other symptoms or conditions remain.
What Does Starting LDN Look Like?
LDN requires a prescription and is commonly obtained through a compounding pharmacy when the desired dose isn't commercially available.
And with LDN, I generally like the philosophy:
Start low. Go slow. Pay attention.
There isn't one perfect dose for everyone.
A provider may begin with a low dose and gradually increase it depending on:
Symptoms
Tolerance
Health history
Other medications
Treatment goals
Clinical response
This isn't a medication I recommend starting based on something you saw on Instagram.
It should be part of an individualized treatment plan.
Are There Side Effects?
LDN is often described as well tolerated, but well tolerated does not mean side-effect free.
Possible effects can include:
→ Vivid dreams
→ Sleep changes
→ Headache
→ GI symptoms
→ Fatigue
→ Changes in mood or energy
Some people notice very little.
Others need their dose or timing adjusted.
And some people simply don't respond.
One VERY Important Medication Interaction
This deserves its own section.
Naltrexone blocks opioid receptors.
That means LDN generally should not be used concurrently with opioid medications unless specifically managed by an appropriately qualified clinician.
This includes medications containing opioids that may be prescribed for pain or cough.
Taking naltrexone when opioids are in your system can interfere with pain control and, in someone who is physiologically dependent on opioids, can precipitate withdrawal.
Always make sure your prescriber knows every medication you're taking before starting LDN.
Does Everyone in Perimenopause Need LDN?
Absolutely not.
LDN isn't a routine perimenopause supplement.
And it's not something I would add simply because you're over 40 and don't feel great.
If you're struggling with:
✓ Joint or muscle pain
✓ Autoimmune symptoms
✓ Persistent fatigue
✓ Brain fog
✓ Sleep issues
✓ Symptoms that haven't fully responded to your current plan
…the next step isn't automatically LDN.
The next step is figuring out WHY.
This Is Where Functional Medicine Is Different
Let's say you're 47.
You're exhausted.
Your joints hurt.
You've gained 15 pounds.
You're waking up at 3 AM.
Your brain feels like it has 37 tabs open.
And your Hashimoto's seems worse than it was five years ago.
Is that perimenopause?
Maybe.
Is it your thyroid?
Possibly.
Insulin resistance?
Could be.
Low iron?
Inflammation?
Poor sleep?
Nutrient deficiencies?
Autoimmune activity?
Also possible.
And more than one of those things can be happening at the same time.
That's why I'm not interested in throwing another medication at the symptom.
I want to connect the dots.
Before We Add Another Medication, Let's Understand Your Body
This is exactly why I created the Vitality Experience.
Instead of guessing based on symptoms alone, we take a deeper look at what's happening underneath them.
Depending on your individual needs, we're looking at patterns involving:
Hormones
Thyroid function
Blood sugar + insulin
Inflammation
Iron status
Vitamin D + B vitamins
Cardiovascular and metabolic health
Nutrient status
Then we combine those results with your symptoms, health history, medications, lifestyle, and goals.
Because maybe LDN makes sense.
Maybe hormone therapy needs to be discussed or adjusted.
Maybe your thyroid needs attention.
Maybe your insulin is telling us something.
Maybe you're deficient in something your body desperately needs.
Or maybe there's another piece we haven't uncovered yet.
That's the point.
The goal isn't to collect more medications.
The goal is to understand what YOUR body needs.?
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