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If I could wish for anything, it might be something (besides caffeine) that leaves me more alert and functioning better cognitively during the daytime. Stimulants are one possibility. They can be very helpful in these diseases (blog is coming up), but they have their drawbacks. But how about a stimulating non-stimulant? That’s the possibility that solriamfetol (Sunosi) brings to the party.

While norepinephrine and dopamine reuptake inhibitors have been trialed in ME/CFS, the small solriamfetol (Sunosi) ME/CFS trial, “Solriamfetol improves daily fatigue symptoms in adults with myalgic encephalomyelitis/chronic fatigue syndrome after 8 weeks of treatment” is the first time that a duo norepinephrine and dopamine reuptake inhibitor (NDRI) has been trialed.

THE GIST

  • Daytime sleepiness

    The RECOVER Initiative’s Sunosi trial to combat daytime sleepiness is still open.

    If I could wish for anything, it might be something (besides caffeine) that leaves me more alert and functioning better cognitively during the daytime.

  • Stimulants are one possibility. They can be very helpful in these diseases (blog is coming up), but they have their drawbacks. But how about a stimulating non-stimulant? That’s the possibility that the solriamfetol (Sunosi) ME/CFS trial brings to the party.
  • While not classified as a stimulant, Sunosi is stimulating. Instead of triggering the release of norepinephrine and dopamine as amphetamines do, Sunosi increases levels of these neurotransmitters by inhibiting their reuptake; i.e. it tries to wring more out of what’s there.
  • Sunosi has been described as potentially producing stronger wakefulness effects than modafinil in some people, as well as cleaner and steadier releases of energy than amphetamines, with less euphoria.
  • Sunosi has been FDA-approved for daytime sleepiness associated with narcolepsy – an intriguing connection given suggestions that ME/CFS may be part of the narcoleptic spectrum of diseases.
  • In the 38-person, double-blinded, placebo-controlled, 8-week trial, participants started at 75mg and gradually increased to 150 mg once daily in the morning.
  • No significant changes were found until the 8th (and last) week of the study when ME/CFS patients on Sunosi increased their scores on the primary endpoint, the Fatigue Severity Index (FSI), to a significant degree. A reduction like this suggests that someone with “very severe fatigue” could move closer to having “moderate fatigue”. It suggests that at least some people experienced a real, noticeable reduction in their fatigue severity.
  • Strangely, however, no improvement in the amount of interference fatigue plays in the lives of ME/CFS patients was observed. Usually, reductions in fatigue come with reductions in the amount of interference they say fatigue plays in a person’s life. This could have been due to the fact that fatigue only dropped significantly in the last week of the study; however, further study of this crucial factor is needed.
  • A “meaningful shift” in planning, organizing, working memory, and task monitoring also appeared to have occurred.
  • Jarred Younger (see video) noted that while the study was too small to tell us much about this drug, its ability to produce some significant improvements (given its small size) was encouraging. This study should lay the ground for a much-needed, larger study.
  • A large RECOVER Initiative long-COVID Sunosi trial is still open. Check out the 47 sites – most of which are still recruiting – here.
  • Without insurance, Sunosi is very expensive. While prices aren’t clear, some information suggests that with insurance, Sunosi might cost anywhere from $40 to several hundred dollars a month.
  • The Arseneau test evaluates factors like the credibility of the source, evidence, benefit/risk to determine whether to try a new treatment. Check out the blog to see how this potential treatment fared.

 

Stimulating but not a “Stimulant”

neuron functioning

Sunosi is trying to get neurotransmitters like dopamine and norepinephrine to hang around more in the synapse between the nerves.

While not classified as a stimulant, Sunosi is stimulating. Instead of triggering the release of norepinephrine and dopamine as amphetamines do, Sunosi increases levels of these neurotransmitters by inhibiting their reuptake by blocking transporter proteins that move them out of the synaptic cleft between the neurons (see image). With these neurotransmitters hanging around more in the synaptic space between the nerves, they should spark more activity in the wake-producing parts of the brain, such as the locus coeruleus, hypothalamus, and basal forebrain.

Sunosi, then, is trying to wring more from the norepinephrine/dopamine that is there.

 

Health Rising’s Quickie Summer Donation Drive is On!

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Please support Health Rising during our quickie summer donation drive. Our goal is to raise $15,000. 

 Find out more here.

Stabilizer – Recent research indicates that by activating TAARI (Trace Amine-Associated Receptor), Sunosi also regulates and stabilizes dopamine and norepinephrine release, and even enhances it slightly; i.e., it also acts like a weak stimulant. It was described as potentially producing stronger wakefulness effects than modafinil in some people, as well as cleaner and steadier releases of energy than amphetamines, with less euphoria.

(TAAR1 has become a therapeutic target for disorders of sleep/wake regulation and ADHD).

Better Than Stimulants?

Hypothalamus

Sunosi seeks to stimulate wake-producing parts of the brain like the hypothalamus without triggering large releases of dopamine and norephinephrine like stimulants do.

The fact that Sunosi doesn’t trigger the release of monoamines like dopamine, norepinephrine, and serotonin, like stimulants do, is potentially a plus. While the large, rapid releases of dopamine and norepinephrine produced by stimulants do quickly increase wakefulness and attention, they also have a high potential for abuse and dependence. While the authors agree that stimulants can be helpful in ME/CFS, they assert that Sunosi’s milder side effect profile and lower risk of abuse and dependence make it a better choice.

Narcolepsy Connection

Sunosi has been FDA-approved for daytime sleepiness associated with narcolepsy or obstructive sleep apnea, but can be used for off-label uses.

Sunosi’s narcolepsy connection is intriguing, given Health Rising’s recent blog which described why a former doctor believes that ME/CFS is on the narcoleptic spectrum. (It’s hard to believe that it’s not, given Xyrem’s good results in fibromyalgia.)

While Xyrem directly supplies orexin, the depleted substance that causes narcolepsy, Sunosi is a dopamine-norepinephrine reuptake inhibitor; i.e., it tries to get the body to wake up. Orexin levels are being assessed for the first time in ME/CFS in the Open Medicine Foundation’s study.

The Study

Despite the fact that nothing about this trial indicated it was a phase IV trial (small, single-center, initial efficacy/side-effect assessment), the authors called it a phase IV trial. It was funded by Sunosi’s manufacturer, Axsome Therapeutics.

In the 38-person, double-blinded, placebo-controlled, 8-week trial, participants started at 75mg and gradually increased to 150 mg once daily in the morning. (Sunosi should not be taken 9 hours before bedtime).

The trial organizers aimed for two historically not-so-easy symptoms to impact: fatigue and executive functioning.

Effectiveness

Fatigue Reduced

progress arrows

By the 8th week, Sunosi significantly improved fatigue in some participants. Like any treatment, some people will benefit while others will not.

No significant changes were found until the 8th (and last) week of the study, when ME/CFS patients on Sunosi increased their scores on the primary endpoint, the Fatigue Severity Index (FSI), by 2.02 points compared to the .46 improvement in the placebo group.

A difference like that could bring someone with “very severe fatigue” to closer to ‘moderate fatigue”. It suggests that at least some people experienced a real, noticeable reduction in fatigue severity.

Strangely, though, no improvement in the amount of interference fatigue plays in the ME/CFS patients’ lives was seen. Improvements in fatigue severity almost always come with an increase in functionality but this was not seen in this study. The fact that it took 8 weeks for fatigue severity to drop significantly, though, may indicate that more time on the drug was needed to result in functionality. It could also be that the reduction in fatigue caused patients to do too much and overreach.

Planning/Organizing Improved

planning and organizing

Sunosi appeared to improve planning and organizing capabilities.

The study also measured executive functioning using the “Behavioral Rating of Executive Function for Adults) (BRIEF A) symptom assessment. The Brief-A is a 75-question assessment that examines aspects such as working memory, planning/organization, task monitoring, material organization, emotional control, self-monitoring, initiation, and others.

The 2.13 reduction in overall BRIEF-A scale (GEC) –2.13 suggested that a “meaningful shift in day-to-day functioning” (e.g., planning, organizing, working memory, self-monitoring)” occurred.

The BRIEF-A MI subscale assesses “metacognition index; i.e., “thinking and organizing” part of executive functioning, which includes things like initiating tasks, working memory, planning/organizing, and organization, was significantly improved in the ME/CFS group taking Sunosi.

The 1.56 reduction, combined with the strong probability assessment (p<.0004), suggested that the patients also experienced a “real, noticeable improvement” in initiating, planning/organizing, working memory, and task monitoring.

Put together, the results suggest that the improvements in the “thinking/organizing” part of executive functioning drove the improvements in the overall BRIEF-A score.

Symptom Severity Moderately Improved

The –0.73 change on the PGI-S (p < .02) suggests that, with regard to severity, the patients perceived a “noticeable” but moderate change in the severity of their symptoms.

Note that all of these changes took 6-8 weeks to show up.

Side Effects

The number of side effects reported by the Sunosi and placebo groups was roughly equal. Note that Sunosi can produce modest increases in blood pressure and heart rate. If you are in the high norepinephrine category, this drug is clearly not for you.

Conclusion

The results were mostly encouraging. While Sunosi is in no way a cure, it did manage to move the needle on two difficult-to-treat symptoms: fatigue and executive functioning.

The lack of functional improvement is a concern, but could reflect over-engagement by the patients or that more time on the drug was needed. The functional aspect needs to be assessed more deeply, given its importance in ME/CFS.

Using a Sympathetic Nervous System Enhancer in ME/CFS (????)

question marks

Using a sympathetic nervous system-enhancing drug may seem strange, but sometimes they can help

Given the sympathetic nervous system dominance typically seen in ME/CFS and POTS, why would anyone think that a norepinephrine-enhancing drug like Sunosi would help? One answer is that these are very complex systems!

Mestinon (pyridostigmine bromide) is another drug that one might think would not work in ME/CFS or POTS. Mestinon enhances norepinephrine release and sympathetic nervous system functioning but it clearly works quite well for some people. Mestinon is believed to enhance “autonomic tone” and improve “vascular resistance”; i.e., blood vessel functioning. POTS studies show that Mestinon, this SNS enhancer, actually reduces tachycardia upon standing, and is believed to increase blood flows to the brain.

Mestinon Moves the Needle on ME/CFS in Exercise Study

Modafinil is another sympathetic nervous system enhancer that can also increase heart rates, but it did not increase heart rates. (It did increase blood pressure.) In other words, it’s hard to predict what will happen.

Because Sunosi can raise heart rates, it might not be appropriate for people with hyperadrenergic POTS.  People with hypotensive/low-blood-volume POTS, on the other hand, might benefit from a slight increase in blood pressure that helps drive more blood to the muscles and the brain.

The takeaway (especially if you have hyperadrenergic POTS) is, as always, to start low and go slow. This study started at 75 mg, but you can split the scored pill and start at 37.5 mg. Because Sunosi increases heart rate and blood pressure in a “dose-dependent” fashion, at low doses, it might not produce any increased heart rate.

Jarred Younger noted that while the study was too small to tell us much about this drug, its ability to produce some significant improvements (given its small size) was encouraging. This study should lay the ground for a much-needed, larger study.

Speaking of larger studies, there is RECOVER’s Long COVID Sunosi study.

RECOVER Sunosi and Modafinil Long COVID Trial Still Open

The RECOVER Initiative did a surprising thing by going out on a limb a bit and targeting “daytime sleepiness in its Sunosi / Modafinil combo trial. (Altogether, RECOVER’s daytime sleepiness (Sunosi/melatonin)/complex sleepiness (melatonin/lighting) studies are projected to contain almost 1,100 participants. (It’s nice to have money…)

Daytime sleepiness

The RECOVER Initiative’s Sunosi trial to combat daytime sleepiness is still open.

RECOVER’s focus on hypersomnia – abnormally long sleep times – was questionable, though, as studies have indicated that while hypersomnia can be present long term in some patients, that, at least in ME/CFS, it generally fades over time in both in children and adults with /CFS. Plus, the few long-COVID sleep studies done suggest that hypersomnia is relatively rare. RECOVER has its own sleep data however, and may be going off that.

Still, daytime sleepiness can occur with or without hypersomnia and is clearly common in both ME/CFS and long COVID. The 10-week study – now underway in dozens of centers across the US – will tell us much about Sunosi’s short-term effectiveness in long COVID.

The study due to end up in December of this year – is still open. Check out the 47 sites – most of which are still recruiting – here. Given that Sunosi is not a cheap drug (see below), a clinical trial is a good way to see if it’s helpful.

Controlled Substance

Sunosi is also a Schedule IV controlled substance in the United States. Schedule IV drugs have the second-lowest risk of abuse. (There are 5 “schedules”). Sunosi, benzodiazepines, and modafinil are all Schedule IV drugs. With Schedule IV drugs, the doctor must be DEA-registered (most are), and up to 5 refills are allowed before a new prescription is required. All in all, the abuse potential is considered low, and this drug is more lightly regulated than others.

Expense

The fly in the ointment is expense. Paying retail would make this a very expensive drug indeed (@$1,000/month). If you have insurance (Aetna, Cigna, Anthem, or UnitedHealthcare), one source said copays can range from a more manageable $40–$150 per month, or if Sunosi is considered a non-preferred brand (Tier 3 or higher), coinsurance rates of 25% to 45% after the deductible may apply. Some plans cap out-of-pocket costs to about $100–$200 per prescription.

Coupons and savings cards can also bring the price down a couple of hundred dollars.

Sunosi Savings Card – Sunosi offers a savings card for eligible patients to pay as little as $9 for a 30-day prescription, but the savings card only works if you have an FDA-approved condition, i.e., daytime sleepiness with narcolepsy or obstructive sleep apnea.

Applying the Arseneau Test

How to Decide Which Treatments To Try for ME/CFS and Fibromyalgia: The Ric Arseneau Talk

Question mark

To try or not to try?

The Arseneau test evaluates the factors below to help determine whether to try a new treatment. My version of it comes from a presentation given by Dr. Ric Arsenau, a Canadian doctor specializing in ME/CFS/FM. The factors are:

  • The credibility of the source – study evidence plus the drug is FDA-approved for two conditions; i.e., the credibility of the source is excellent.
  • The quality of the evidence – fair; it was a good, well-constructed study, but the size was too small to determine how well the drug works in the ME/CFS population as a whole.
  • The benefit, cost, and the risk-benefit analysis – the benefit appears to be moderate, the cost can vary from very high to moderately high ($100/month) depending on insurance, and the risk appears to be low.

In cases like this, where the risk is low, the benefit is moderate (but can be significant), and the cost may be high, much depends on the state of one’s personal finances. For me, if I could get my insurance to bring the cost down dramatically, I would give it a try for a month to see if a personal sore spot (executive functioning – organizing/planning/initiating) and my daytime fatigue improved.

 

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Health Rising’s Quickie Summer Donation Drive is On!

Keeping up with the latest research in ME/CFS, long COVID, fibromyalgia, and allied diseases. Exploring new treatment possibilities. Learning how others have recovered. All in as thoroughly and comprehensively as we can. 

Please support Health Rising during our quickie summer donation drive. Our goal is to raise $15,000. 

 Find out more here.

Please support Health Rising in our Quickie Summer Donation Drive! Our goal is $15,000.Click here for more.

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