Can Zoloft cause hair loss? In the UK, this medicine is dispensed as sertraline (formerly branded as Lustral), and hair loss is indeed a recognised, albeit uncommon, side effect. Classified as telogen effluvium — a diffuse, temporary shedding — it affects between 1 in 100 and 1 in 1,000 people taking the drug. Crucially, the underlying condition being treated, such as depression or anxiety, can itself trigger hair shedding, making it difficult to identify sertraline as the sole cause. This article explains the evidence, frequency, mechanisms, and practical steps to take if you notice hair loss while taking sertraline.

Does Sertraline Cause Hair Loss?

Yes, hair loss is a recognised adverse effect of sertraline, listed in its UK Summary of Product Characteristics; it most commonly presents as telogen effluvium — diffuse, temporary shedding — rather than patchy or permanent loss.

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Sertraline is a selective serotonin reuptake inhibitor (SSRI) widely prescribed in the UK for depression, anxiety disorders, obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD). In the UK it is dispensed generically as sertraline; the historic UK brand name was Lustral. 'Zoloft' is a brand name used in some other countries but is not the usual UK name for this medicine. Sertraline works by blocking the reabsorption of serotonin in the brain, increasing the availability of this neurotransmitter and helping to regulate mood.

Hair loss (medically termed alopecia) is a recognised adverse effect of sertraline. It is listed in the medicine's Summary of Product Characteristics (SmPC), as held on the Electronic Medicines Compendium (EMC) and overseen by the Medicines and Healthcare products Regulatory Agency (MHRA), and cases have been reported to the MHRA through the Yellow Card pharmacovigilance scheme. The type of hair loss most commonly associated with SSRIs, including sertraline, is telogen effluvium — a diffuse, temporary shedding of hair rather than patchy or permanent loss. This pattern is recognised in UK primary care dermatology guidance from the Primary Care Dermatology Society (PCDS).

Telogen effluvium occurs when a physiological or pharmacological stressor pushes a larger-than-normal proportion of hair follicles into the resting (telogen) phase prematurely. This typically results in noticeable shedding two to four months after the triggering event, which can make it difficult to identify sertraline as the cause without a careful medication history. Importantly, this form of hair loss is generally reversible once the trigger is removed or the body adapts.

It is worth noting that the condition being treated — particularly depression and chronic stress — can itself contribute to hair shedding, making it challenging to attribute hair loss solely to the medication. Patients should not stop taking sertraline without first speaking to their GP or prescribing clinician, as abrupt discontinuation carries its own risks.

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How Common Is Hair Loss as a Side Effect of Sertraline?

Hair loss is classified as uncommon in the sertraline SmPC, affecting an estimated 1 in 1,000 to 1 in 100 users; the majority of people taking sertraline do not experience any hair loss.

Hair loss associated with sertraline is classified as an uncommon side effect in the UK SmPC (available via the EMC). In line with standard EU/UK frequency terminology, 'uncommon' means it is estimated to affect between 1 in 1,000 and 1 in 100 people taking the medication. The majority of people taking sertraline do not experience any hair loss at all.

Post-marketing surveillance data, including reports submitted via the MHRA Yellow Card scheme, have documented cases of alopecia linked to sertraline use. However, because these reports are voluntary and do not account for confounding factors, they cannot be used to establish a definitive causal rate. The BNF monograph for sertraline similarly lists alopecia as an uncommon adverse effect. Clinical trial data on this specific side effect are limited, and any comparison with placebo rates should be interpreted with caution given the small numbers involved.

Key points regarding frequency:

• Most users will not experience hair loss during sertraline treatment.

• Hair shedding, when it does occur, is typically temporary and mild.

• Onset is usually delayed by several weeks to months after starting the medication.

• Spontaneous recovery often occurs even without stopping the drug, as the body adjusts — typically within three to six months.

It is also important to consider that people who notice hair loss while taking sertraline may be experiencing shedding unrelated to the medication. Given that sertraline is commonly prescribed during periods of significant psychological stress — itself a well-established trigger for telogen effluvium — disentangling the contribution of the drug from that of the underlying condition requires careful clinical assessment. If hair loss is a concern, a GP can help evaluate the most likely cause.

Why Some Antidepressants May Affect Hair Growth

SSRIs such as sertraline may disrupt the hair growth cycle by altering serotonergic signalling in follicle cells, though the precise mechanism remains theoretical and not fully established in human clinical evidence.

The precise mechanism by which sertraline and other SSRIs may contribute to hair loss is not fully understood, and the explanations below remain largely theoretical. Hair follicles are metabolically active structures that are sensitive to systemic changes, including shifts in neurotransmitter activity and hormonal signalling.

One proposed hypothesis is that SSRIs, by altering serotonin levels, may indirectly influence the hair growth cycle. Serotonin receptors have been identified in hair follicle cells, and changes in serotonergic signalling may disrupt the normal progression through the anagen (growth), catagen (transition), and telogen (resting) phases. This disruption could result in a greater number of follicles entering the telogen phase simultaneously, leading to the diffuse shedding characteristic of telogen effluvium. However, robust human clinical evidence for this mechanism is limited.

Some researchers have also suggested that SSRIs may affect prolactin levels or interact with thyroid function — both of which are known regulators of hair growth — though again, the evidence in humans remains limited and theoretical.

Not all antidepressants carry the same risk profile for hair loss, and individual susceptibility varies:

• SSRIs (e.g., sertraline, fluoxetine, citalopram) — uncommon association with telogen effluvium, as listed in their respective SmPCs.

• SNRIs (e.g., venlafaxine) — similarly reported in rare cases.

• Tricyclic antidepressants — also occasionally linked to hair changes.

Note that bupropion, sometimes mentioned in international literature on antidepressant-related hair loss, is not routinely used as an antidepressant in the UK; it is licensed here primarily for smoking cessation and is therefore not directly relevant to UK antidepressant prescribing.

The fact that hair loss is not universal among SSRI users suggests that individual genetic factors, baseline hair follicle sensitivity, and concurrent health conditions all play a role in determining susceptibility.

What to Do If You Notice Hair Loss While Taking Sertraline

Speak to your GP before making any medication changes; they will investigate common causes such as anaemia, thyroid dysfunction, and iron deficiency, and advise on watchful waiting, dose adjustment, or switching antidepressant if appropriate.

If you notice increased hair shedding after starting sertraline, it is important to approach the situation calmly and methodically. The first and most important step is to speak with your GP or prescribing clinician before making any changes to your medication. Stopping sertraline abruptly can cause discontinuation syndrome, characterised by symptoms such as dizziness, nausea, irritability, and flu-like feelings, and should always be done under medical supervision with a gradual tapering plan.

Your GP will likely take a thorough history to determine whether the hair loss is related to sertraline or another cause. First-line investigations in primary care typically include:

• Full blood count (FBC) — to check for anaemia

• Thyroid function tests (TFTs) — as both hypothyroidism and hyperthyroidism are common causes of hair loss

• Ferritin levels — iron deficiency is a frequent and treatable cause of diffuse shedding

A hormonal profile (for example, to assess for androgenic alopecia or polycystic ovary syndrome) is generally considered only if there are relevant clinical features such as menstrual irregularity, hirsutism, or acne, rather than as a routine first step.

If sertraline is identified as the likely cause and the hair loss is distressing, your clinician may consider:

• Watchful waiting, as many cases of telogen effluvium resolve spontaneously within three to six months

• Dose adjustment, if clinically appropriate

• Switching to an alternative antidepressant, though this must be weighed carefully against the risk of destabilising mental health

Seek prompt medical advice — and ask for urgent or specialist assessment — if you notice any of the following red flags:

• Patchy hair loss with scalp scaling, redness, pustules, or pain (which may suggest tinea capitis, a kerion, or scarring alopecia)

• Rapid or severe diffuse shedding

• Signs of scarring on the scalp (permanent hair loss may result if scarring alopecia is not treated promptly)

• Hair loss in a child (tinea capitis is predominantly a paediatric condition and requires prompt treatment to prevent scarring)

In the meantime, gentle hair care practices — avoiding excessive heat styling, tight hairstyles, and harsh chemical treatments — can help minimise further mechanical damage. Referral to a dermatologist may be appropriate if hair loss is severe, persistent, or accompanied by other skin or scalp changes.

If you think sertraline or any other medicine may be causing a side effect, please report it to the MHRA via the Yellow Card scheme at https://yellowcard.mhra.gov.uk/. Your report helps improve medicine safety for everyone.

Other Factors That Can Cause Hair Loss Alongside Sertraline

Depression, nutritional deficiencies, thyroid disorders, hormonal changes, and other medications are all common causes of hair loss that must be considered before attributing shedding solely to sertraline.

When evaluating hair loss in someone taking sertraline, it is essential to consider the wide range of other conditions and circumstances that commonly cause or contribute to hair shedding. In many cases, sertraline may be coincidental rather than causal, and identifying the true underlying trigger leads to more effective management.

Mental health conditions themselves are a significant and often overlooked contributor. Depression and anxiety are associated with elevated cortisol levels and chronic physiological stress, both of which are well-established triggers for telogen effluvium. This means that hair loss may have begun — or been set in motion — before sertraline was even started.

Other common causes of hair loss to consider include:

• Nutritional deficiencies — iron deficiency and low ferritin are the most consistently evidenced nutritional causes of diffuse hair shedding and are worth checking in primary care; evidence for routine testing of zinc or vitamin D in the absence of specific clinical features or risk factors is more limited

• Thyroid disorders — both hypothyroidism and hyperthyroidism can cause significant hair thinning

• Hormonal changes — including postpartum hair loss, the menopause, or hormonal contraceptive use

• Autoimmune conditions — such as alopecia areata, which causes patchy hair loss

• Scalp conditions — including seborrhoeic dermatitis or tinea capitis (the latter is predominantly seen in children and requires prompt treatment to prevent scarring)

• Other medications — anticoagulants, retinoids, beta-blockers, and certain mood stabilisers are all associated with hair loss

• Significant physical illness or surgery — any major physiological stressor can precipitate telogen effluvium

A holistic assessment is therefore crucial. NICE Clinical Knowledge Summaries (CKS) cover relevant topics including alopecia areata, tinea capitis, and female pattern hair loss, and the Primary Care Dermatology Society (PCDS) provides structured UK primary care guidance on diffuse hair loss and other alopecias. These resources recommend a structured approach that considers medical history, medication review, nutritional status, and hormonal factors before attributing hair loss to any single cause.

Patients are encouraged to keep a timeline of when hair loss began relative to starting sertraline and any other life events or stressors, as this information can be invaluable to their clinician. Further information for patients is also available via the NHS website (NHS: Hair loss) and the British Association of Dermatologists (BAD) patient information leaflets.

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