Shrinks In Sneakers

Tag: Serotonin modulator

  • Post-SSRI Sexual Dysfunction (PSSD): An Emerging Concern

    Post-SSRI Sexual Dysfunction (PSSD): An Emerging Concern

    Antidepressants, particularly selective serotonin reuptake inhibitors (SSRIs), have been a cornerstone of treatment for mood and anxiety disorders for decades. However, as their use has become more widespread, concerns about their side effects—particularly those related to sexual health—have grown. A new wave of attention has focused on Post-SSRI Sexual Dysfunction (PSSD), a phenomenon in which sexual side effects persist even after the discontinuation of SSRI medications.

    What is PSSD?

    It is well-established that up to 50% of patients taking SSRIs experience some degree of sexual dysfunction while on the medication. These effects are usually thought to be transient, resolving within weeks or months after stopping the drug. However, PSSD represents a different and more troubling pattern: persistent sexual dysfunction lasting three months or longer after discontinuing the medication.

    Patients with PSSD frequently report symptoms such as:

    • Genital anesthesia (reduced or absent genital sensation).
    • Anorgasmia (inability to achieve orgasm).
    • Loss of libido (reduced or absent sexual desire).

    In men, erectile dysfunction and ejaculatory issues are common, while women often report reduced arousal and difficulty achieving orgasm. Unlike transient sexual dysfunction, the hallmark of PSSD is its persistence long after the drug has been stopped.

    The Challenge of Evidence

    The evidence supporting PSSD as a formal diagnosis remains limited and primarily consists of:

    • Case reports
    • Case series
    • Observational data, often derived from internet forums and patient advocacy groups

    While these sources highlight distressing patient experiences, they fall at the bottom of the evidence hierarchy. Without randomized controlled trials or large-scale cohort studies, it is impossible to definitively establish causation between SSRI use and PSSD. This lack of robust evidence complicates efforts to understand the true prevalence, biological mechanisms, and risk factors for PSSD.

    Potential Biological Basis

    The exact mechanism of PSSD remains unclear, but hypotheses include:

    1. Serotonin neurotoxicity: Excessive serotonin signaling may lead to long-lasting changes in the central or peripheral nervous systems.
    2. Dopamine suppression: Chronic serotonin elevation may inhibit dopamine pathways, which play a critical role in sexual function.
    3. Receptor desensitization or downregulation: Long-term SSRI use may alter serotonin and other neurotransmitter receptors in ways that persist after discontinuation.

    None of these theories have been definitively proven, and more research is needed to uncover the underlying pathophysiology.

    Prevalence and Diagnosis

    The true prevalence of PSSD is unknown due to the lack of large, high-quality studies. However, anecdotal reports suggest it may be rare but severely impactful for those affected.

    Currently, there are no standardized diagnostic criteria for PSSD. The most common approach involves:

    1. A history of SSRI use.
    2. Persistent sexual dysfunction lasting three months or more after discontinuing the medication.
    3. Symptoms such as genital anesthesia or nipple insensitivity, which are more specific to PSSD compared to general sexual dysfunction.

    What to Do if You Suspect PSSD

    For clinicians and patients encountering persistent sexual dysfunction, it’s essential to first explore modifiable and reversible causes of sexual dysfunction:

    • Lifestyle factors: Obesity, smoking, poor cardiovascular health, and sedentary behavior can contribute to sexual dysfunction.
    • Endocrine issues: Low testosterone or other hormonal imbalances should be evaluated.
    • Medications: Drugs such as finasteride (for hair loss) and isotretinoin (for acne) are also associated with persistent sexual dysfunction and may confound the diagnosis.

    If PSSD remains the primary suspected diagnosis, a timeline of symptoms is crucial. Note when the antidepressant was started, when sexual dysfunction began, and whether the symptoms improved or worsened after stopping the drug.

    The Bottom Line

    PSSD is an evolving area of concern in psychiatry and pharmacology. While current evidence does not definitively prove a causal relationship between SSRIs and persistent sexual dysfunction, the growing number of reports warrants further investigation. Until higher-quality studies emerge, clinicians should approach this condition with empathy and caution.

    Patients experiencing sexual dysfunction should work closely with their healthcare providers to rule out reversible causes and explore management options. For now, the best strategy is awareness, vigilance, and a patient-centered approach to treatment planning.

  • Everything You Need to Know About Trintellix (Vortioxetine)

    Everything You Need to Know About Trintellix (Vortioxetine)

    Introduction:

    Vortioxetine is sold under the brand name Trintellix, and Brintellix and it’s approved for use in major depressive disorder. The name was changed to Trintellix in the U.S. due to confusion with Brillinta an anti-platelet medication. It was studied in generalized anxiety disorder (GAD) at lower doses, but the quality of the evidence is poor and does not appear to improve symptoms or quality of life in patients with GAD. 

    I want to make a quick point before going into the details about the medication. When I say the effect size is moderate and Vortioxetine does not perform better than other options for depression, I’m not saying in an individual case that it may not outperform other antidepressants that the person has tried in the past. It very well might for that individual. I’m talking about on average in large sample sizes, Vortioxetine does not outperform other medications according to the current literature. It’s also not a go to medication for treatment resistant depression, the literature does not support this either.

    The one place Vortioxetine does seem to stand out is cognitive function. Multiple studies have shown this medication to improve cognitive dysfunction associated with depression. It also appears to improve cognitive function in geriatric depression but failed to show any benefit in neurocognitive disorders like Alzheimer’s disease. It was also looked at as a potential treatment for attention deficit hyperactivity disorder (ADHD) but failed to show an adequate benefit in trials. 

    Mechanism of Action and Receptor Targets

    This medication falls into a class known as serotonin modulators and stimulators. It is thought to work by several different mechanisms:

    -Serotonin reuptake inhibitor

    -5-HT1A agonist (may diminish sexual side effects) 

    -5-HT1B partial agonist 

    -5-HT1D, 5-HT3 (may enhance noradrenergic and cholinergic activity that improves cognition while reducing nausea), and 5-HT7 antagonist (pro-cognitive and antidepressant effects) 

    The most robust action is on serotonin reuptake and 5-HT3 antagonism, while the other interactions are considered minor. 

    Target Affinity Ki (nM)Action 
    SERT1.6Inhibition 
    NET113Inhibition 
    5-HT1A 15Agonist 
    5-HT1B33Partial agonist 
    5-HT1D 54Antagonist 
    5-HT2C180 
    5-HT3A3.7Antagonist 
    5-HT719Antagonist 

    Metabolism

    Vortioxetine is metabolized by CYP2D6, 3A4/5, 2C19, 2C9, 2A6, 2C8 and 2B6, the half-life is 66 hours and it’s dosed one time per day. Reduction is dosing may be needed for patients taking strong CYP2D6 inhibitors (e.g. bupropion).

    Dosing:

    -5-20 mg/day 

    -Tablets come as 5 mg, 10 mg, and 20 mg 

    -The initial dose for depression is 10 mg which can be increased as needed to a maximum dose of 20 mg daily. 

    -For GAD does were kept lower 5-10 mg/day range 

    -Can be taken with or without food 

    -It can be stopped without a tapper 

    Side Effect:

    Common side effects include nausea, vomiting, constipation, sexual dysfunction, weight gain is unusual but possible. Nausea and sexual dysfunction were the most common side effects; all other side effects were reported in less than 10% of cases. 

    Sexual dysfunction was found in both the plebe group and the treatment arm. The incidence was 14-20% for placebo and 16-34% for those in the treatment arm.

    Rare life-threatening side effects include seizures, induction of mania and suicidal ideation. 

    Avoid using tramadol as it can increase the risk of seizure, and do not combine with MAOIs as this can result in serotonin syndrome. 

    It’s generally not recommended in pregnancy. 

    Conclusion

    While this medication may be helpful for some individuals there is no evidence to support its use in treatment resistant depression or other disorders outside of the primary indication major depressive disorder. There does seem to be a benefit for patients who have significant cognitive dysfunction as a result of depression and maybe that is where this medication best fits into a treatment plan. The main side effects are nausea and sexual dysfunction which are common with all antidepressant options. You must also consider the cost of the medication in comparison to duloxetine which outperformed Vortioxetine in some clinical trials.