The s-ketamine vs r-ketamine effects can be confusing since both are the same molecule of ketamine, but act a little differently on the brain. S-ketamine, or esketamine, has been used extensively in the treatment of depression and is currently FDA approved for use as a nasal spray. R-ketamine (also known as arketamine) continues to be an area of research, with many of the hopeful pieces of evidence confined to lab and preliminary clinical trials in humans.
The difference is important because people tend to think that one form has to be “stronger” or “better.” The science is more complicated. S-ketamine binds more potently to NMDA receptors, while R-ketamine may affect multiple pathways differently. The significance of these differences on mood, perception, side effects, and duration of benefit is still being investigated.
In Orlando Premier Psychiatry, it is essential to know the difference between medications and psychiatric options to provide personalized Psychiatric services. When looking for psychiatrist near me, psychiatrist orlando, or psychiatry orlando, it’s important to understand the differences between these options to facilitate a more informed discussion with a qualified psychiatric professional.
Key Takeaways
- Ketamine comes in two forms, S-ketamine and R-ketamine, which are mirror images.
- S-ketamine is also called esketamine and is the active ingredient in the recently approved nasal spray Spravato.
- There is also an arketamine, which is referred to as R-ketamine, still being developed for psychiatric indications.
- S-ketamine binds more strongly with the NMDA receptor than does R-ketamine.
- The findings indicate that R-ketamine has been found to have longer-lasting antidepressant effects in some animal research; however, this has not been confirmed in humans yet.
- S-ketamine can cause temporary dissociation, dizziness, sedation, nausea, increased blood pressure, and anxiety.
- Both forms have an impact on perception and awareness particularly at higher exposures.
- When talking about psychiatric treatment with ketamine, it’s important to take a patient’s medical history, medications, symptoms, and safety precautions into account.
What are S-Ketamine and R-Ketamine?
Ketamine comes in two forms which are mirror images, called enantiomers. They are called S-ketamine and R-ketamine.
Esketamine is known as S-ketamine. It has a greater affinity for the NMDA receptor than R-ketamine. Spravato is a nasal spray that contains esketamine and was approved by the FDA for certain patients with depression in adults. Possible adverse reactions listed in the FDA prescribing information include dissociation, dizziness, sedation, nausea, anxiety, increased blood pressure and more.
Arketamine is also known as R-ketamine. Currently, R-ketamine hasn’t been approved by the FDA for the treatment of depression like esketamine. It is still being studied for its potential effects due to laboratory studies that indicated some interesting potential antidepressant properties.
The distinction is significant when talking about the effects of s-ketamine and r-ketamine. R-ketamine is the subject of much excitement due to the preclinical findings, whereas S-ketamine has considerably more well-documented evidence in psychiatric application in humans.
What is the Difference Between S-Ketamine and R-Ketamine?
The major difference lies in the ability of each molecule to bind to specific receptors in the brain.
S-Ketamine binds with greater affinity to the NMDA receptor than does R-Ketamine. NMDA receptors play a role in the glutamate signal, learning, memory and communication between brain cells. These receptors can be blocked to make the activity greater via other glutamate receptors, such as AMPA receptors. The researchers think these changes could play a role in the fast-acting antidepressant effects of ketamine.
The NMDA receptor is involved in a different interaction with R-ketamine. In fact, animal research indicates that although R-ketamine binds less tightly to the NMDA receptor, it can produce a more potent and longer lasting antidepressant-like effect.
That discovery has fueled research to explore mechanisms associated with BDNF, AMPA receptors, ERK, and brain cell connection changes, among others, which could be targeted to improve the lives of others. But, these mechanisms are still being studied.
Hence, the s-ketamine versus r-ketamine effects cannot be considered as a mere “stronger versus weaker” comparison.
S-Ketamine vs. R-Ketamine: Effects on the Brain
S-ketamine and R-ketamine have similar, but not identical, effects on the brain.
S-ketamine and R-ketamine have similar, but not identical, effects on the brain.
S-Ketamine has a higher affinity for NMDA receptors. This can affect activity of glutamate and the subsequent communication between neurons. They indicate that greater activity at the AMPA receptor and changes in the brain-derived neurotrophic factor could play a role in fast fluctuations in mood-related brain circuits.
The pharmacological profile of R-ketamine seems to differ. The effects of its action have been studied, and have been determined not to be directly related to the action of NMDA receptor blockade, but rather to other downstream pathways that are associated with neural connections and signaling.
It is important to note that researchers haven’t mapped out the entire effects to human mood changes. Although early research on R-ketamine was promising, randomized controlled studies in humans have not always replicated the potent antidepressant effects observed in animal research, as was reported in a 2023 review.
That is why the issue of the difference between the effects of s-ketamine and r-ketamine is still not settled, but is an active research area.
How Quickly Do S-Ketamine and R-Ketamine Work?
Ketamine has a relatively quick effect compared to other typical antidepressant medications.
Individuals may experience mood changes within hours or days of taking esketamine; responses to esketamine vary. This is an FDA-approved nasal spray that is administered with supervision, and it may cause temporary sedation or dissociation; the spray is not used at home.
In animal studies, R-ketamine has also exhibited rapid antidepressant properties. But researchers can not assume the same timing for humans, as it has been in animals.
When you’re looking into the effects of s-ketamine vs r-ketamine, you should distinguish between lab results and human studies. This helps to prevent misguided expectations of speed of change in mood with either form.
Considering Ketamine Infusion in Orlando?
If you’re considering ketamine for psychiatric treatment, Orlando Premier Psychiatry can help clarify whether a ketamine treatment, or other psychiatric treatment is right for you.
Ketamine Services are provided by Orlando Premier Psychiatry
To address concerns please call to arrange a psychiatric consultation.
How Long Do the Effects of S-Ketamine and R-Ketamine Last?
One of the most intriguing differences that researchers are studying is duration.
Some animal research indicates that R-ketamine may have antidepressant-like effects that persist longer than the effects of S-ketamine. These results do not, however, prove that R-ketamine has longer-lasting effects on people.
Human studies with esketamine have helped to establish its effectiveness in certain types of depression; however, it may last longer for some individuals than others. Ongoing psychiatric follow-up is important as the psychiatric symptoms may fluctuate over time.
It is thus more correct to state that early research indicates that the effects of R-ketamine could last longer than s-ketamine effects, and not that it is a known human effect.
Which Conditions Are S-Ketamine and R-Ketamine Used For?
The FDA has already approved S-ketamine (esketamine) for some depressive disorders in adults. Treatment resistant depression and depressive symptoms with acute suicidal ideation or behavior in major depression are included in the current FDA label.
There are other areas of research that involve ketamine and its enantiomers, such as PTSD, anxiety, and other mood disorders. But, not all uses are FDA-approved if a study is being conducted.
R-ketamine is still in clinical trials for depression. It is currently being investigated for its antidepressant properties without the perceptual effects, but more thorough studies are required in humans.
The initial action for anyone looking for ketamine infusion orlando is to have a psychiatric assessment done, not to presume a specific type of ketamine is the right choice.
Is S-Ketamine More Effective Than R-Ketamine for Depression?
It is not possible to make a straightforward comparison because of the lack of evidence.
The good news is that S-ketamine is FDA-approved and there is more human research available. R-ketamine has been demonstrated to have antidepressant-like activity in animal studies, with some studies indicating a more prolonged effect. But, their effects have been inconsistent in human trials.
As such, the most apt response to the question of “S-ketamine vs. R-ketamine effects” is that S-ketamine is better established for certain psychiatric applications, and R-ketamine is still an area of research.
Receptor strength and/or animal-study results should not be the only criteria used when comparing the two.
Can S-Ketamine and R-Ketamine Cause Addiction?
Ketamine is known to be subject to misuse and abuse. The Food and Drug Administration warning on the prescribing label for esketamine cautions against abuse and misuse, and the National Institute on Drug Abuse classifies ketamine as a dissociative drug that can affect perception, memory and awareness.
Not everyone who takes prescribed esketamine or ketamine will become addicted to the drug. Risk is based on factors of personal history, exposure, dose, frequency and the way that the substance is used.
The long-term misuse profile of R-ketamine is less well-defined in humans as it is still under research.
If someone is concerned with cravings, increased use, or non-prescribed use of ketamine, he or she should be open with a psychiatric provider about those concerns.
Who May Be a Candidate for S-Ketamine or R-Ketamine?
Each medication has its own criteria for eligibility, including the person’s symptoms, medical history, medications he/she is taking at the time and safety considerations.
S-ketamine is FDA-approved for certain indications and is required to be used under special safety guidelines. After administration, there are concerns of sedation, dissociation, elevated blood pressure, and compromised attention/decision making that necessitate FDA observation.
R-ketamine, on the other hand, is investigational for depression. Access and availability, therefore, vary from FDA approved esketamine.
A psychiatrist or psychologist may assess your symptoms, past drug or alcohol use, cardiovascular factors, and other factors before considering adding a ketamine-based treatment to your treatment options.
Ready to Discuss Your Options in Orlando?
Orlando Premier Psychiatry offers customized Psychiatric service in Orlando and via Telehealth and if you are wondering what the difference between s-ketamine and r-ketamine effects mean for you, we can help you.
No matter if you typed in psychiatry near me, psychiatry orlando fl, or psychiatry in Orlando to your search, you can connect with the team and discuss your symptoms, medication history, and psychiatric choices.
To schedule a consultation with Orlando Premier Psychiatry, please call (407) 565-3546.
Frequently Asked Questions
What Are the Potential Side Effects of R-Ketamine?
R-ketamine is still being studied, so there is not enough information to know exactly how it affects people. They point to the fact that it may be associated with less perceptual effects than S-ketamine, although more human evidence would be useful to draw conclusions.
Is S-Ketamine the Same as Esketamine?
Yes. Esetamine is the common name for S-ketamine. It is one of the two stereoisomers of ketamine. Spravato contains the active ingredient of esketamine, which is a nasal spray approved by the U.S. Food and Drug Administration for use in adults in certain types of depression.
Is R-Ketamine FDA Approved for Depression?
Arketamine (also known as No. R-ketamine) is NOT approved by the FDA to treat depression yet. Its potential antidepressant properties are still a subject of study, with the question of whether it could be beneficial with fewer undesirable perceptual side effects.
Can S-Ketamine and R-Ketamine Both Help Treat Depression?
Both have been demonstrated to be antidepressant in research, albeit the evidence differs. Although there is some evidence of human use for S-ketamine, R-ketamine is still in the investigational stage and needs further high-quality human research.
How Do S-Ketamine and R-Ketamine Affect the Brain?
They both inhibit glutamate signaling and NMDA receptors; however, S-ketamine has a higher affinity for the NMDA receptor. R-ketamine seems to target other signaling pathways, and scientists are just working out the impact of these differences on mood and perception.
Is R-Ketamine Longer-Lasting Than S-Ketamine?
In animal research, it seems that R-ketamine may have more sustained antidepressant-like activity than S-ketamine. This has not been consistently identified in humans, however, and should be considered as a research opportunity, not a confirmed difference.
Can S-Ketamine Cause Hallucinations or Anxiety?
Yes. S-ketamine may lead to dissociation, perceptual changes, anxiety, dizziness, sedation and other effects, for a short period of time. Reported adverse reactions include dissociation and anxiety, so it is important to watch for these after use.
Disclaimer
This article is informational, and shouldn’t be used in place of individual psychiatric advice, diagnosis or medication recommendations. There are significant differences in the regulatory status, evidence, risks and availability of S-ketamine and R-ketamine. Do not alter or discontinue any prescribed medication without consulting a qualified health care professional. In the United States, call or text 988 to get immediate mental health assistance, or seek immediate help if you are at risk of causing any harm to yourself.
References and Authoritative Sources
- U.S. Food and Drug Administration (FDA), Spravato (esketamine) Prescribing Information. FDA Spravato Prescribing Information
- U.S. Food and Drug Administration, Depression Medicines: Esketamine Information. FDA Depression Medicines Information
- National Institute on Drug Abuse (NIDA), Psychedelic and Dissociative Drugs. NIDA Psychedelic and Dissociative Drugs Research
- PubMed, The Antidepressant Actions of Ketamine and Its Enantiomers. PubMed Research Review
- PubMed, Is (R)-Ketamine a Potential Therapeutic Agent for Treatment-Resistant Depression? PubMed R-Ketamine Review
