Is anyone here microdosing LowDoseNatrexone (LDN)?
I received capsules containing 1.5 mg from Ageless RX. After the second night/pill I woke groggy and with the worst nasal congestion I have ever had. A day later the effects from the pill two nights ago are still felt.
Would appreciate suggestions on how to microdose. The capsules are tiny. I think I would like to try 0.5 mg. But would welcome guidance.
My primary reasons for wanting to take LDN: reduce inflammation and possibly forestall neurodgeneration.
It’s odd to me that you had that kind of reaction to such a low dose. I guess it’s just different body chemistry. I have been taking 4.5 mg of LDN before bed, and I have noticed nothing other than that it seems to blunt my taste for food. Which I don’t need. Maybe wait a few days and try it again. Your reaction may have been coincidental.
I started low, and over a few weeks, I titrated up to the 4.5
It completely messed up my sleep and I hated how I felt on it for 3 weeks. I committed to giving it a month and assumed I’d be ending the trial, but then it flipped.
Now, you would pry it out of my cold dead hands
During the early days, I had joined the ldn facebook group to see what o could learn. I discovered reactions (and dosing) are all over the place!
In addition to that, some people even seem to do better on higher doses than lower. Go figure.
A friend had given up, and when he heard my story, he tried again and then his pain went away and now likes it
I know some people get the full rx dose (not compounded) and they crush and mix it with some sort of liquid in order to be able to finely tune their dose. I have no idea if that would work w the compounded form but not sure why it wouldn’t ?
FWIW it’s one of my very favorite interventions. Rapa cured my lifelong chronic insomnia, but after ldn, I have only used a sleep aid once since staring and that was only because I was sick and miserable last month.
It has also altered my enjoyment of food. I no long loooove anything, not even a great glass of wine. :(. I have even had to change how I eat a bit to maintain my weight (champagne problem)
Thank you Beth and Charles. Perhaps I am simply sick with a cold: I did just get back from visiting the two little granddaughters. I will try it again when I am back to feeling normal.
They can compound it for you to start at a lower dose and work up more slowly. I believe I asked them about that when I started it with them based on what some people on reddit had experienced at the standard starting dose. I didn’t really have side effects except for some more dreams at first then that went away as I got used to it.
I started at 1mg LDN, and had to drop down from there due to intolerable side-effects. I’m now at .8mg, titrating up verrry slowly.
This to say that by my experience, your results are not unusual. Everyone is different. Give it weeks; you may adjust. As @Beth says, it can be completely worth it.
For me, it’s given me an 100-day streak of no fatigue. I’m hoping that at higher doses it will let me return to rapamycin.
As for the how, I make my own solution from a 50mg single tablet (RXed by my PCP). I dilute the pill in 50mL distilled water, so 1mg/mL. Then I use a 1ml syringe to get the exact dose I want. There’s more to it than that, but not a whole lot. LMK if you want details.
I’ve had negative reactions to LDN even at these doses.
Every time I do it at night it makes sleep worse. I’m going to try using it in the morning in the future, if at all. Only reason people use it at night is to not be awake is the opioid receptor block effect is in action isn’t it?
Yes, taking it at bedtime saturates the opioid receptors for a couple of hours. I do remember when I first started taking LDN at a dose of ~2 mg. It seemed to cause a little restlessness for the first few days. Now at 4.5 mg, it really improves my sleep. I never wake up in the middle of the night anymore. It’s not the naltrexone alone, but it seems to be the final piece of the puzzle for me. As naltrexone affects people differently, I am sure my sleep stack is tailored just for me, so I am not going to publish it.
I think your body could adjust to naltrexone fairly quickly. Just take it in the morning. Its effect on sleep is not the primary benefit we are looking for.
An excerpt from Gemini Pro 3.1:
LDN is not a traditional sedative or sleep aid; rather, it improves sleep quality indirectly by addressing the underlying disruptors of rest.
The Long-Term Benefits
For people dealing with chronic discomfort, autoimmune issues, or systemic inflammation, sleep is often fractured by a hyper-aroused nervous system. By dampening neuroinflammation and boosting endorphins, LDN helps stabilize the sleep-wake cycle.
Data from institutions like Stanford University exploring LDN for conditions like fibromyalgia have noted significant improvements in deep, restorative sleep. Patients frequently report waking up feeling more refreshed because their bodies aren’t fighting internal inflammatory stress all night.
The Initial Adjustment (The “Technicolor” Dream Phase)
There is a catch when you first start or increase a dose of LDN. For the first 1 to 2 weeks, it can actually cause sleep disturbances. The temporary blockade of opioid receptors at night can alter standard sleep architectures—specifically REM sleep—leading to:
Difficulty falling or staying asleep initially.
Highly vivid, intensely memorable, or “technicolor” dreams.
These side effects aren’t typically nightmares, just remarkably vivid dreams. Fortunately, they are a sign the medication is interacting with the central nervous system as intended, and they almost always fade within a couple of weeks as the body adjusts to its new, higher endorphin baseline.
A Quick Note on Dosing Strategy
Because LDN can be slightly stimulating or cause those intense dreams early on, timing matters. Many clinicians initially recommend taking it at night to maximize the morning endorphin surge. However, if the nighttime dose disrupts your rest, it is completely safe and common to shift the dose to the morning. Studies show that morning dosing is just as effective over time and completely bypasses the nighttime sleep disruption.
For me, the grog was so bad, even at low doses, that I was non-functional all day, for many days on end. I had to go down on dose to make it work. Intense dreams were the least of my issues.
Wanting to get to the bottom of this I shared some forum quotes (without naming names) with Gemini Pro 3.1 extended thinking.
FWIW:
The forum posts you shared illustrate a well-known phenomenon in integrative medicine: LDN has one of the widest sensitivity curves of almost any compound. While some people thrive immediately at 4.5 mg, hyper-sensitive individuals can struggle at doses as low as 0.1 mg.
There are five main physiological reasons why some people experience extreme intolerance to low doses:
1. Prolonged Blockade (The “Slow Metabolizer” Effect)
For LDN to work its magic, the receptor blockade is supposed to be transient—lasting roughly 2 to 4 hours. Once the medication clears, the body experiences the beneficial “endorphin rebound.”
However, genetics play a huge role in how fast liver enzymes (specifically dihydrodiol dehydrogenases) break down naltrexone.
In a slow metabolizer, a 1 mg dose might stay bound to mu-opioid receptors for 8 to 12 hours instead of 3.
If someone wakes up while their opioid receptors are still actively blocked, they won’t get an endorphin high—they will experience brain fog, heavy grogginess, severe fatigue, and anhedonia (the “LDN hangover” mentioned in your first quote).
2. Fillers & Mast Cell/Histamine Activation
The quote about the “worst nasal congestion ever” is a classic telltale sign. Many people who seek out LDN do so for autoimmune conditions, Mast Cell Activation Syndrome (MCAS), or chronic inflammatory issues.
These individuals often aren’t reacting to the naltrexone itself, but to two other factors:
Compounding Fillers: Telehealth providers and pharmacies often use standard fillers like microcrystalline cellulose (Avicel), lactose, or cornstarch. Hyper-sensitive immune systems can react aggressively to these excipients.
Transient Histamine Release: As LDN begins modulating Toll-like receptor 4 (TLR4) on immune cells, it can cause a brief, temporary release of histamine or inflammatory cytokines from mast cells before stabilizing them. In sensitive people, this shows up as sinus pressure, nasal congestion, or skin flushing.
3. Microglial “Rebound Flares” in Central Sensitization
In healthy tissue, LDN acts as an anti-inflammatory by turning off hyper-reactive microglia (the brain’s immune cells).
However, in conditions involving central sensitization (like Fibromyalgia, ME/CFS, or Long COVID), the microglia are locked in a hyper-vigilant state. When LDN hits TLR4 receptors on these primed cells, the sudden shift in immune signaling can trigger a temporary cytokine flare before the cells calm down. To the patient, this feels like a sudden worsening of their baseline flu-like symptoms, aches, and fatigue.
4. Extremely Low Baseline Endorphins
If someone has been dealing with chronic severe pain or prolonged psychological/physiological stress, their baseline production of endogenous endorphins might be near zero.
When you block opioid receptors in someone with normal endorphins, they barely notice the brief block. But if you block receptors in someone whose endorphin system is already depleted, removing that tiny remaining baseline signal can cause heightened pain sensitivity, anxiety, and intense sleep disruption.
Misconception Check: Why Take It at Night?
One of the forum quotes speculated: “Only reason people use it at night is to not be awake when the opioid receptor block effect is in action, isn’t it?”
Actually, no—the original reasoning behind nighttime dosing is based on circadian biology:
The human body naturally synthesizes the majority of its daily endorphins in the early morning hours, around 4:00 AM. Taking LDN at bedtime (around 10:00 PM to 11:00 PM) aligns the 3-hour blockade perfectly with this natural surge. When the drug wears off around 2:00 AM, the brain hits the gas pedal on endorphin production right as its natural clock is gearing up to make them.
That said, for people who experience insomnia or hyper-vivid dreams from nighttime dosing, shifting to morning dosing is a widely accepted workaround. While you miss the precise 4:00 AM circadian window, clinical experience shows that long-term immunomodulation and pain reduction are nearly identical.
How Hyper-Sensitive Users Usually Adapt
When patients struggle below 1 mg, experienced LDN practitioners usually recommend two strategies:
Switching to Liquid Drops: Using a liquid suspension to start at Ultra-Low Dose Naltrexone (ULDN) levels—sometimes as low as 0.1 mg or 0.25 mg—and titrating up by tiny increments every few weeks.
Changing the Filler: Requesting a hypoallergenic filler (like ginger powder, calcium carbonate, or sucrose) from a specialized compounding pharmacy.
Hi there! You are not alone in your sensitivity to ldn. I started at 0.25 mgs and the effect was profound. At the start, I experienced insomnia, a lasting low level headache, and I immediately had no desire for wine/etoh. The negative side effects did go away after a week or two, and I was able to enjoy a glass of wine, but didn’t have that need to drink with dinner which was a huge change, and my snacking was a bit reduced. I titrated up to 0.5 mg and that was great too. However, when I went to 1 mg I did not do as well, and I seem to have developed some runs of tachycardia/racing heart out of the blue. I’ve been taking 0.5 mgs for a couple of years now maybe two or three so I have good experience, but I just want you to know that you may be able to experience robust response to this medicine at very, very low doses.
Count me as another one who had intolerable sleep and hangover the next day. Shifted to am dosing . Took 4 weeks for the side effects to disappear. Also titrate as slow as possible. I added 1mg of Rapamycin weekly and that seeems to really help.
I had specific target. I have panclass intolerance to Lipid Lowering medication. ie-the muscle pain that many people get to statins, i get to all statins, repatha, BA, eztemibe. This is uncommon but not rare. I uploaded my genome to Claude 4.8 and it suggested a gene variant that I have, would respond to LDN and LDRapa. After 6 wks of LDN and 3 wks of LD Rapa I can tolerate Repatha. After a LDL ck in a few wks I may add on another LLM.
I buy my 50mg naltrexone pills off alldaychemist.com and dilute in water as Sol says. Then one can dose at any daily amount you want.
FWIW I think night dosing is most beneficial but practicioners have said that if not night then doing at AM during the day is still beneficial and may mediate your side effects. The dreams drive me crazy and do most of my daily dose in the AM.
Hi Deborah, when starting again, take it in the morning to avoid groggyness.
The dose you are thinking to try (0,5 mg) works well for some people as a starter.
While nasal congestion is not one of the most common side effects, it does occur in some people. Seems that it can be an adjustment (3-7 days) of your immune system and/or histamine/mast cell response.
But if you have again the reaction (and not solves in a week or so), try other compounded LDN, as the reaction is sometimes caused by the filler or capsule material rather than the naltrexone itself.
Best xx
A Quick Note on Dosing Strategy