The Antidepressant Side Effects No One Talks About: Sexual Dysfunction & Emotional Blunting

Depression is a serious and common mental health problem. 1 in 10 in the UK will experience a depressive episode, many of whom will experience recurrent episodes or chronic symptoms.[1]

The mainstay of available treatments are limited to antidepressant medication, psychological therapy and lifestyle interventions such as exercise (or a combination of these).

Over 8.3 million people are prescribed antidepressant medication in the UK at any one time.[2] Whilst these medications can be useful and in some cases, life-saving, unfortunately, antidepressants can have significant side effects for many. Some of these side effects have been long ignored, perhaps because until recently we haven't had many alternatives.

Two antidepressant side effects that are seldom talked about include impaired sexual functioning and emotional blunting.

Quick Summary

Sexual dysfunction affects 58-73% of people taking SSRIs/SNRIs (sertraline, fluoxetine, etc.).[3] Symptoms include reduced desire, arousal difficulties, and inability to orgasm. Women are particularly affected but understudied.

Emotional blunting affects 40-60% of users[4]—feeling emotionally "flat," less joy, caring less about things. Often unreported to doctors but a major reason for stopping medication.

PSSD (Post-SSRI Sexual Dysfunction) is rare but can persist months/years after stopping medication.[5]

What you can do: Talk to your doctor—these are common, recognised side effects. Alternative medications, dosage adjustments, or non-medication treatments (like tDCS) may help. Never stop antidepressants suddenly.

Studies and Clinical Care Tend to Focus on Early Use, Neglecting Long-Term Effects

Unfortunately, studies of antidepressant medications tend to focus mostly on early use over the initial couple of months. The focus here is to study response of depressive symptoms, safety, and side effects in these early stages.

There are a lack of longer term studies focusing on the impact of side effects, in real world settings where patients typically take these medications for much longer periods and sometimes over many years.

Likewise in routine practice there is more clinical concern in the initiation phase regarding side effects that may impact on the patient's safety or ability to keep taking medication such as agitation, sedation, or an increase in suicidal thoughts. Side effects such as sexual dysfunction or blunting may not be considered with the same level of importance, meaning they may get overlooked. Patients may also be embarrassed or reluctant to raise these issues if not asked, or simply may not realise these experiences can be caused by their medication.

How Common Is Sexual Dysfunction from Antidepressants?

It is, of course, very important to recognise that depression itself can negatively impact a person's libido and sexual functioning, and that recovering from depression is often associated with an improvement in this important area of people's lives. So whilst both depression and antidepressant medication can impact on sexual functioning, it is important to understand what the side effects can be, particularly for women who are at greater risk of experiencing depression than men yet for whom this is less often spoken about and less often studied.

Sexual side effects of antidepressants, particularly SSRIs and SNRIs, may affect 58-73% of users.[3] Sexual side effects from antidepressant medication tend to occur in the early stages of treatment.[6] These drugs can reduce desire, arousal, and orgasm, with women often understudied.

We have known that sexual side effects can arise from antidepressant medication for decades, as with most areas of medicine, most of the academic and research focus has been on male sexual dysfunction, and this continues to be the case despite it seeming that sexual side effects are just as problematic for women.

Why This Particularly Affects Women:

• Women are twice as likely to be prescribed antidepressants as men[7]
• Highest use is in 45-64 year-olds—also the peri/menopausal age when sexual symptoms may already be present[8]
• Female sexual dysfunction is already prevalent in the general population[9]
• Yet most research focuses on male sexual dysfunction, leaving women underserved
• Women are less likely to report these issues to doctors due to stigma

The result: A large population of women silently dealing with medication-induced sexual dysfunction that's rarely acknowledged or addressed.

Sexual Dysfunction Symptoms from Antidepressants

Women may experience:

• Reduced sexual desire or libido
• Difficulty becoming aroused
• Difficulty reaching orgasm or anorgasmia (inability to orgasm)
• Less intense or satisfying orgasms
• Reduced sexual thoughts or fantasies

Men may experience:

• Reduced libido
• Erectile dysfunction
• Delayed ejaculation or inability to ejaculate
• Reduced orgasm intensity

Timeline: These symptoms typically appear within the first 2-8 weeks of starting medication and may persist for the duration of treatment. In rare cases (PSSD), they continue after stopping medication.

Important: Depression itself can reduce libido. If these symptoms appear after starting antidepressants when depression is improving, they're more likely medication-related.

What Is Post-SSRI Sexual Dysfunction (PSSD)?

There is also a recognised, although thankfully rarer, long-term condition called post-SSRI sexual dysfunction (PSSD)[5] which involves persistent sexual dysfunction experienced by patients even after discontinuation of their antidepressant medication.

⚠️ Post-SSRI Sexual Dysfunction (PSSD): Rare but Important to Know

What is PSSD? A rare condition where sexual dysfunction persists for months or years after stopping antidepressant medication.

Symptoms:

• Reduced genital sensation
• Low libido
• Reduced arousal
• Vaginal dryness (women)
• Erectile dysfunction (men)
• Premature or delayed ejaculation (men)
• Weaker orgasms or inability to orgasm

Prevalence: Rare, but likely underreported. Added to product warnings for many SSRIs/SNRIs.[10]

What to know: While rare, if you experience persistent sexual dysfunction after stopping medication, this should be reported to your doctor and potentially to medication safety authorities (Yellow Card Scheme in UK, FDA MedWatch in US).

What Is Emotional Blunting and Why Does It Happen?

Emotional blunting whilst taking antidepressant medication is widely reported by patients, but less well recognised as a problematic side effect despite this being experienced by an alarming 40 to 60% of users.[4] Although any practicing psychiatrist will be familiar with this as a common reason for patients disliking taking antidepressant medication, it's poorly researched and understood.[11]

One study in 2023 suggested a potential mechanism for this blunting effect that many patients describe as a result of a medication-induced reduction in sensitivity to reward feedback pathways.[12]

What Does Emotional Blunting Feel Like?

Patients describe emotional blunting in various ways:

Common descriptions:

• "I feel emotionally flat or numb"
• "I don't feel joy or excitement about things I used to love"
• "I care less about everything—good or bad"
• "I feel like I'm watching life through glass"
• "Music doesn't move me anymore"
• "I can't cry even when I want to"
• "I feel disconnected from my emotions"
• "It's like living in emotional black-and-white instead of colour"

The paradox: While the medication reduces emotional pain from depression (which is good), it can also reduce emotional range and intensity across the board (which feels limiting).

Prevalence: 40-60% of antidepressant users experience this, yet it's rarely discussed in initial consultations or follow-ups.

What Happens When You Live with These Side Effects Long-Term?

From talking to many patients over the years, it's clear to me that this is often something that is unspoken about in the consultation room, and that patients often struggle with alone. Doctors may neglect to enquire about these side effects and patients may not raise them.

Putting Up with Long-Term Side Effects

Some may decide to put up with the side effects and suffer in silence. For these people, it may be that this feels to be the best or only option when compared to becoming unwell again, but these issues can have significant impact on a person's quality of life and relationships.

Impact on Adherence and Relapse Risk

It's difficult for us to know exactly how widespread these adverse effects are due to lack of high quality research, especially in women. However we know that both sexual dysfunction and emotional blunting are likely common reasons for lack of adherence, reducing doses, discontinuation, or being reluctant to start medication again when a person relapses.[13]

Which Antidepressants Are Less Likely to Cause These Side Effects?

There are a number of antidepressant medications that are less likely to cause sexual dysfunction.[14] However, many of these have problematic side effects of their own, such as weight gain or sedation, and several are not routinely available in the UK.[15]

Up to 70% of people taking common antidepressants experience sexual dysfunction — including reduced libido, difficulty arousing, or delayed orgasm.

Antidepressants by Side Effect Profile:

SSRIs (Sertraline, Fluoxetine, Citalopram): These are the most commonly prescribed antidepressants in the UK, but they also have the highest rates of sexual dysfunction (58-73%) and emotional blunting (40-60%). While effective for many people, these side effects are significant.

SNRIs (Venlafaxine): SNRIs have a similar side effect profile to SSRIs, with high rates of sexual dysfunction and moderate to high rates of emotional blunting. They work slightly differently but carry comparable risks.

Mirtazapine: This medication has lower to moderate rates of sexual dysfunction and moderate emotional blunting. However, it commonly causes weight gain and sedation, which can be problematic for some patients.

Bupropion: This antidepressant has low rates of both sexual dysfunction and emotional blunting, making it an attractive option. Unfortunately, it's not currently available in the UK, though it's widely used in the United States.

Agomelatine: Another medication with low rates of sexual dysfunction and emotional blunting. However, it's not routinely available in the UK and requires liver function monitoring.

Trazodone: This medication has low to moderate rates of sexual dysfunction and variable emotional blunting. It's often prescribed for sleep issues alongside depression but may cause sedation and dizziness.

Important: Switching medications should ALWAYS be done with medical supervision. Never stop or change antidepressants without consulting your doctor.

Non-Medication Treatment Options: Flow tDCS Therapy

There is a huge need for accessible wider treatment options with non-medication based solutions such as the Flow headset offering an effective alternative. More treatment options are desperately needed, particularly those that don't cause these types of side effects.

The Flow headset in particular, is one such option, and this can be safely combined with antidepressant medication or used as a standalone treatment, depending on the person's individual medical needs.

Flow tDCS (transcranial Direct Current Stimulation) offers an option with minimal side effects and no sexual dysfunction or emotional blunting.[16]

Key benefits of Flow:

• Clinically proven to reduce depression symptoms by 40-45%[17]
• No sexual side effects reported in clinical trials
• No emotional blunting—users report feeling more emotionally engaged, not less
• Can be used at home, 30 minutes daily
• Safe to combine with antidepressants or use as standalone treatment
• Recommended by the Royal College of Psychiatrists[18]
• Available on NHS in select areas

Unlike antidepressant medications that work systemically throughout the body, Flow delivers gentle electrical stimulation directly to the prefrontal cortex—the specific brain region involved in depression. This targeted approach means it doesn't interfere with sexual function, hormone systems, or emotional processing in the way that medications can.

What Should I Do If I'm Experiencing Sexual or Emotional Side Effects?

Please don't suffer in silence and remember these side effects are common and your doctor will not be embarrassed to discuss them with you. Talk to your doctor so they can support you to consider your options.

People should never stop taking antidepressants suddenly as this can be dangerous in terms of withdrawal effects and/or relapse risk. All treatment decisions should always be discussed with a medical professional with access to your medical history.

How to Talk to Your Doctor About These Side Effects

Many people feel embarrassed or don't know how to bring this up. Here's a script:

Opening:

"I wanted to talk to you about some side effects I've been experiencing since starting [medication name]."

For sexual side effects:

"I've noticed [reduced libido/difficulty with arousal/difficulty reaching orgasm]. I know this can be a side effect of SSRIs. It's affecting my quality of life and relationship. What are my options?"

For emotional blunting:

"I feel like the medication is working for my depression, but I feel emotionally flat or numb. I don't feel joy or excitement like I used to. Is this common? Can we adjust something?"

Ask these questions:

1. "Could we try lowering my dose?"
2. "Are there alternative medications with fewer sexual/emotional side effects?"
3. "What about adding or switching to a non-medication treatment like tDCS?"
4. "If I want to try a different approach, what's the safest way to transition?"

Remember: Your doctor has heard this before. It's a recognised, common side effect. You're not the first or only patient to raise this concern.

If you're experiencing these side effects and want to explore a medication-free alternative or complementary treatment, Flow is available risk-free for 30 days. Learn more at www.flowneuroscience.com/shop

References

[1] McManus, S., et al. (2016). Mental health and wellbeing in England: Adult Psychiatric Morbidity Survey 2014. NHS Digital.

[2] NHS Digital. (2022). Prescriptions Dispensed in the Community, Statistics for England - 2011 to 2021.

[3] Serretti, A., & Chiesa, A. (2009). Treatment-emergent sexual dysfunction related to antidepressants: a meta-analysis. Journal of Clinical Psychopharmacology, 29(3), 259-266.

[4] Read, J., et al. (2014). Adverse emotional and interpersonal effects reported by 1829 New Zealanders while taking antidepressants. Psychiatry Research, 216(1), 67-73.

[5] Bala, A., et al. (2018). Post-SSRI Sexual Dysfunction (PSSD). International Journal of Risk & Safety in Medicine, 29(3-4), 229-242.

[6] Montejo, A.L., et al. (2001). Incidence of sexual dysfunction associated with antidepressant agents: a prospective multicenter study of 1022 outpatients. Journal of Clinical Psychiatry, 62 Suppl 3, 10-21.

[7] Martin, R.M., et al. (2007). Prescription of antidepressants in the UK population. British Journal of Psychiatry, 190(2), 164-165.

[8] NHS Digital. (2022). Prescribing for Mental Health, England - 2021/22.

[9] McCabe, M.P., et al. (2016). Incidence and Prevalence of Sexual Dysfunction in Women and Men: A Consensus Statement from the Fourth International Consultation on Sexual Medicine 2015. Journal of Sexual Medicine, 13(2), 144-152.

[10] European Medicines Agency. (2019). PRAC recommendations on signals. Updated warnings for SSRIs and SNRIs regarding persistent sexual dysfunction.

[11] Price, J., et al. (2009). Emotional side-effects of selective serotonin reuptake inhibitors: qualitative study. British Journal of Psychiatry, 195(3), 211-217.

[12] Goodwin, G.M., et al. (2023). Emotional blunting with antidepressant treatments: A survey among depressed patients. Journal of Affective Disorders, 331, 177-183.

[13] Bull, S.A., et al. (2002). Discontinuation of use and switching of antidepressants: influence of patient-physician communication. JAMA, 288(11), 1403-1409.

[14] Clayton, A.H., et al. (2002). Prevalence of sexual dysfunction among newer antidepressants. Journal of Clinical Psychiatry, 63(4), 357-366.

[15] Taylor, D., et al. (2021). The Maudsley Prescribing Guidelines in Psychiatry, 14th Edition. Wiley-Blackwell.

[16] Knotkova, H., et al. (2019). Practical Guide to Transcranial Direct Current Stimulation. Springer.

[17] Brunoni, A.R., et al. (2016). Repetitive Transcranial Magnetic Stimulation for the Acute Treatment of Major Depressive Episodes: A Systematic Review with Network Meta-analysis. JAMA Psychiatry, 74(2), 143-152.

[18] Royal College of Psychiatrists. (2020). Position statement on transcranial direct current stimulation (tDCS). College Report CR193.