Lyng Pharmacy
Medicines A–Z · SSRI antidepressant

Sertraline

An SSRI antidepressant · Written by the Lyng Pharmacy team, based on NHS and BNF guidance · Updated August 2026
Also sold asLustral
Type of medicineSSRI antidepressant
Available asTablets, oral solution
How you get itPrescription only

Sertraline is one of the most commonly prescribed SSRIs in the UK. Two things about it are worth knowing before you start: it takes weeks rather than days to work, and the first fortnight can feel worse before it feels better — which is exactly when people give up on it.

What it is used for

Depression, obsessive compulsive disorder, panic disorder, post-traumatic stress disorder and social anxiety disorder. It is also used off-label for some other anxiety conditions.

How to take it, and how long it takes

Once daily, with or without food, at the same time each day. Morning suits people who find it disturbs sleep; evening suits those who feel drowsy on it.

Timeline worth having in your head:

Side effects

Nausea, headache, diarrhoea, difficulty sleeping, dry mouth, sweating and tiredness are common early on and generally settle. Sexual side effects — reduced desire, difficulty reaching orgasm — are common and often persist while taking it; they are worth raising rather than enduring, as options exist.

Contact your doctor urgently if you have thoughts of harming yourself, if you feel markedly more agitated or restless, or if you develop a high temperature with muscle stiffness, sweating, agitation or a racing heart. Increased agitation or suicidal thoughts are most likely in the first few weeks or after a dose change, and are a reason for prompt review — not for suffering it out.

If you are having a difficult time and need to talk to someone now, the Samaritans are on 116 123, free, at any hour.

Stopping it

Never stop sertraline abruptly. Withdrawal effects — dizziness, electric-shock sensations, nausea, irritability, vivid dreams, flu-like feelings — can be genuinely unpleasant. Coming off it is done gradually, over weeks or months, guided by your GP.

That is also true if you feel completely well. Feeling well is the medicine working, and stopping early is a common route back to relapse.

Interactions and other points

Tell your prescriber about other antidepressants, triptans for migraine, tramadol, St John’s wort, anti-inflammatories such as ibuprofen, aspirin and anticoagulants — SSRIs increase bleeding risk when combined with those.

Alcohol is best limited, particularly at first; it can worsen both drowsiness and low mood.

Sertraline is one of the SSRIs with more reassuring data in pregnancy and breastfeeding, but this is a decision to make with your GP, not alone.

Always read the label. This page is general information, not advice for your situation. Doses, warnings and interactions differ between products and between people. Check the leaflet inside your medicine, and ask our pharmacist if anything is unclear — that conversation is free and takes two minutes.

Questions about Sertraline?

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Frequently asked questions

How long does sertraline take to work?
Usually four to six weeks for the fuller effect, though sleep and appetite often improve sooner. The first two weeks are typically the hardest.
Can I stop sertraline once I feel better?
Not abruptly, and usually not straight away — treatment is normally continued for at least six months after you feel well, then reduced gradually with your GP.
What happens if I stop sertraline suddenly?
Withdrawal effects such as dizziness, electric-shock sensations, nausea and irritability are common. Always reduce gradually under GP guidance.
Can I drink alcohol on sertraline?
Best limited, particularly early on. Alcohol can increase drowsiness and worsen low mood.

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