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Zoloft (sertraline hydrochloride) is a selective serotonin reuptake inhibitor (SSRI) indicated for the treatment of major depressive episodes, panic disorder with or without agoraphobia, obsessive-compulsive disorder (OCD) in adults and children aged 6 to 17 years, social anxiety disorder, and post-traumatic stress disorder (PTSD) in adults. It works by selectively inhibiting the reuptake of serotonin (5-hydroxytryptamine, 5-HT) at the presynaptic serotonin transporter in the central nervous system, thereby increasing serotonergic neurotransmission. Sertraline has minimal affinity for adrenergic, histaminergic, muscarinic, and dopaminergic receptors, which accounts for its relatively favourable tolerability profile compared to tricyclic antidepressants. It has a slow onset of therapeutic action, with improvements in mood, anxiety, and obsessional thinking developing over several weeks of continuous treatment.
Usual adult dose: For major depression and OCD: the recommended starting dose is 50 mg once daily. The dose may be increased in increments of 50 mg at intervals of at least one week, up to a maximum of 200 mg daily. For panic disorder, PTSD, and social anxiety disorder: treatment should be initiated at 25 mg once daily for the first week to minimise the risk of an initial anxiogenic effect, then increased to 50 mg once daily. The usual therapeutic maintenance dose across all indications is 50 mg to 100 mg once daily. Doses above 100 mg should be reserved for patients who have not responded to lower doses and should be prescribed under specialist supervision only. Zoloft should be taken as a single daily dose, either in the morning or evening, with or without food. In elderly patients, the starting dose of 25 mg is recommended, and the dose should be titrated with caution. No dose adjustment is required in mild to moderate renal impairment; caution is advised in severe renal impairment. In hepatic impairment, a lower dose or less frequent dosing should be considered due to reduced clearance. Abrupt discontinuation should be avoided; the dose should be tapered over several weeks to minimise withdrawal symptoms. In children with OCD aged 6 to 12 years, the starting dose is 25 mg once daily, increased to 50 mg after one week; in adolescents aged 13 to 17 years, the dose can be titrated to 50 mg after one week and up to a maximum of 200 mg daily based on clinical response.
Dosage form: Film-coated tablets: 25 mg (green, capsule-shaped, scored on one side and debossed with "ZOL 25" on the other), 50 mg (blue, capsule-shaped, scored on one side and debossed with "ZOL 50" on the other), and 100 mg (yellow, capsule-shaped, scored on one side and debossed with "ZOL 100" on the other). All strengths are scored, allowing the tablets to be divided into equal halves. An oral concentrate solution (20 mg/mL) is also available for patients who have difficulty swallowing tablets and must be diluted before administration.
Onset of action: Sertraline has a gradual onset of therapeutic effect, consistent with the pharmacological mechanism of action involving adaptive changes in receptor sensitivity and neuroplasticity. Initial improvements in appetite, sleep, and energy may be observed within the first 1 to 2 weeks. Clinically significant improvements in depressed mood, anxiety, and anhedonia generally become apparent after 2 to 4 weeks of treatment at a therapeutic dose. The full antidepressant and anxiolytic response may require 8 to 12 weeks. In OCD, the therapeutic response may take longer, with maximal benefit often achieved after 12 weeks or more. Peak plasma concentrations of sertraline are reached 4.5 to 8.4 hours after oral administration.
Duration of action: Sertraline has a mean elimination half-life of approximately 26 hours, supporting once-daily dosing. The active metabolite, N-desmethylsertraline, has a longer half-life of 62 to 104 hours and contributes minimally to overall pharmacological activity. Steady-state plasma concentrations of the parent drug are achieved after approximately one week of daily dosing. On discontinuation, plasma levels decline gradually, and the prolonged presence of the metabolite provides a degree of self-tapering that may attenuate the severity of withdrawal symptoms compared to SSRIs with shorter half-lives, such as paroxetine.
Alcohol recommendation: Alcohol consumption should be avoided during treatment with Zoloft. Although sertraline does not potentiate the cognitive and psychomotor effects of alcohol to the same degree as older sedating antidepressants, alcohol is a central nervous system depressant and can worsen depression, anxiety, and insomnia. Alcohol intake may interfere with the therapeutic benefit of sertraline and increase the risk of sedation, dizziness, and impaired judgement. In patients with a history of alcohol misuse, sertraline should be prescribed with caution, and the risks of combining sertraline and alcohol should be explicitly discussed. Patients are advised to abstain from alcohol during the initial phases of treatment and to limit intake thereafter.
Most common side effects: Nausea is the most frequently reported adverse effect at the start of treatment, occurring in approximately 20% to 25% of patients. This is generally mild to moderate, dose-related, and usually diminishes after the first 1 to 2 weeks. Diarrhoea, dry mouth, dyspepsia, and anorexia are also common gastrointestinal effects. Sexual dysfunction is a well-recognised and often under-reported side effect of SSRIs and includes delayed ejaculation, anorgasmia, erectile dysfunction, and reduced libido. These effects are frequently dose-dependent and may persist in some patients after discontinuation. Insomnia, somnolence, agitation, and tremor are common central nervous system effects, particularly during the early phase of treatment. Headache, fatigue, and increased sweating are also frequently reported. Hyponatraemia, usually attributed to the syndrome of inappropriate antidiuretic hormone secretion (SIADH), is more common in elderly patients and should be considered in the setting of unexplained confusion, drowsiness, or seizure. A paradoxical increase in anxiety or agitation, particularly at the initiation of treatment or during dose escalation, may occur and requires close monitoring, especially in younger adults and adolescents. An increased risk of suicidal ideation and behaviour has been observed in young adults aged 18 to 24 years during the initial weeks of therapy, and all patients should be carefully monitored for clinical worsening and suicidality. Sertraline is associated with a dose-dependent QTc prolongation, which is generally modest but may be clinically relevant in patients with pre-existing cardiac conduction abnormalities or those receiving concomitant medications that prolong the QT interval.
Would you like to try Zoloft (Sertraline) without a prescription?
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14-21 days | 10$ | Tracking# available in 4 days |
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9-14 days | 30$ | Tracking# available in 2 days |
At our pharmacy, you can buy Zoloft without a prescription, with discreet and anonymous packaging delivered within 5-14 days across the UK.
Zoloft is the branded version of sertraline, an SSRI antidepressant manufactured by Pfizer. It is the same drug as generic sertraline, same molecule, same mechanism, same evidence base. Some patients prefer the brand because they started on it and do not want to switch. Some find that a particular generic does not agree with them and the brand does. The active ingredient is identical. The excipients, the fillers and binders, differ slightly between manufacturers. For most people, this makes no difference. For a少数, it does.
Zoloft is used for major depression, panic disorder, obsessive-compulsive disorder, social anxiety disorder, post-traumatic stress disorder, and premenstrual dysphoric disorder. The starting dose is 50 mg once daily for depression and most anxiety disorders. For panic disorder and PTSD, starting at 25 mg for the first week reduces the initial anxiety that some patients experience. The dose can be increased in 50 mg increments at weekly intervals. The maximum is 200 mg daily. OCD often requires doses at the higher end of the range. Tablets come as 25 mg, 50 mg, and 100 mg. The 50 mg tablet is the standard starting point. The 25 mg is for titration. The 100 mg is for maintenance.
Sertraline blocks the serotonin transporter on presynaptic neurons, preventing serotonin reuptake from the synaptic cleft. More serotonin stays available to bind to postsynaptic receptors. That is the simple version. The therapeutic effect is not immediate because the presynaptic 5-HT1A autoreceptors initially reduce serotonin firing in response to the increased synaptic serotonin. Over 2 to 4 weeks, these autoreceptors desensitise, serotonergic transmission increases, and mood and anxiety begin to improve. The delay is built into the neurobiology.
Sertraline has a modest effect on dopamine reuptake, more than most other SSRIs. This weak dopamine activity may contribute to a slightly better profile for energy and motivation compared to more sedating SSRIs like paroxetine. It also binds to sigma receptors, though the clinical relevance is uncertain. Oral bioavailability is 80% to 100%, and food increases absorption. Peak plasma levels occur at 4 to 8 hours. The half-life is about 26 hours, allowing once-daily dosing. Steady state is reached in about a week. The drug is metabolised extensively in the liver, mainly by CYP2C19, with contributions from CYP2B6, CYP2C9, CYP3A4, and CYP2D6. The active metabolite, desmethylsertraline, has about 10% of the potency of the parent drug. Excretion is roughly equal between urine and faeces.
Take it once daily, in the morning or evening depending on how it affects you. For some, sertraline is activating and taking it at night causes insomnia. For others, it causes fatigue and evening dosing works better. Start in the morning for the first week. If you feel wired, stay with morning dosing. If you feel sedated, switch to evening. There is no pharmacological advantage to one over the other.
Take it with or without food. Food reduces nausea, which affects about 20% of patients in the first week or two. A small meal or a cracker is enough. The nausea passes as the gut serotonin receptors adapt. Do not stop Zoloft abruptly. Discontinuation symptoms, dizziness, electric shock sensations known as brain zaps, irritability, flu-like symptoms, can start within days of stopping. Taper the dose over weeks to months. A patient on 200 mg for years needs a slow, stepwise reduction. A patient on 50 mg for 3 months can taper faster.
If you forget a dose, take it as soon as you remember. If it is nearly time for the next one, skip the missed dose. Do not double up. Missing a single day is unlikely to cause discontinuation symptoms because the half-life is long. Missing several days in a row can. Keep a routine. Pair the tablet with something you do every morning, brushing teeth, making coffee, so it becomes automatic.
Nausea, diarrhoea, and loose stools affect a significant minority in the first weeks. This is serotonin acting on gut receptors. It settles. Taking the tablet with food and avoiding spicy or fatty meals in the first fortnight helps. Headache, dry mouth, and increased sweating are less common. The sweating, particularly night sweats, can persist and is one of the more stubborn side effects.
Sexual dysfunction is the side effect that matters most to many patients and the one least likely to be volunteered. Delayed ejaculation, reduced libido, and erectile difficulty affect about 30% to 50% of men on SSRIs. In women, reduced desire and delayed orgasm are similarly prevalent. It may improve after the first few months or it may persist. It is dose-dependent. Reducing the dose can restore function without losing the antidepressant effect. Adding bupropion or switching to a drug with fewer sexual side effects, agomelatine or vortioxetine, are options. Do not stop Zoloft because of sexual side effects without discussing alternatives.
Weight gain is less pronounced with sertraline than with paroxetine or mirtazapine, but it occurs. A gain of 2 to 5 kg over a year is typical. If weight starts to climb, dietary attention and exercise early are easier than trying to lose weight later. Insomnia or somnolence, depending on the patient, usually declare themselves early and guide dosing time. Agitation and an increase in anxiety can occur in the first days to weeks. This is why starting at 25 mg for anxiety disorders is common. The anxiety surge is transient. It is not a sign the drug is wrong. It is the serotonergic system being perturbed before it adapts.
Pregnancy is a risk-benefit analysis. Sertraline crosses the placenta. The data on congenital malformations are largely reassuring, with a small possible increase in cardiac septal defects but a low absolute risk. Neonatal adaptation syndrome in the third trimester, irritability, feeding difficulties, respiratory distress, jitteriness, affects about 10% to 30% of exposed neonates. It is usually mild and self-limiting. Untreated depression in pregnancy carries its own risks, poor antenatal care, low birth weight, postnatal depression, impaired mother-infant bonding. The decision to continue or taper is made by the patient and the perinatal psychiatrist together. Sertraline has more pregnancy data than most SSRIs and is often the preferred agent.
Breastfeeding is compatible with sertraline. Levels in breast milk are low. Adverse effects in nursing infants are rare. The benefits of treating maternal depression during the postnatal period are substantial. Sertraline and paroxetine have the lowest milk levels of the SSRIs.
Children and adolescents with depression can be treated with sertraline, but efficacy data are weaker than in adults. The risk of increased suicidal ideation in the first weeks is well-documented across all SSRIs in this age group. This is not a reason to avoid treating a depressed young person. It is a reason to monitor closely, particularly in the first month, and to ensure the prescribing is done by a child and adolescent psychiatrist.
Older adults metabolise sertraline more slowly. Start at 25 mg and titrate cautiously. Hyponatraemia is more common in the elderly on SSRIs, particularly if they are also on diuretics. Sodium should be checked before starting and a few weeks into treatment. A confused older patient on sertraline with a sodium of 125 mmol/L is a classic presentation. Stopping the SSRI and restricting fluids usually corrects it.
Bipolar disorder must be excluded before starting sertraline. An SSRI without a mood stabiliser can trigger a manic episode. The screening question is: have you ever had a period of days where you felt unusually high, energetic, or irritable, needed less sleep, and did things you later regretted? If the answer is yes, the diagnosis may not be unipolar depression, and the prescribing decision changes.
Zoloft can cause drowsiness, dizziness, and blurred vision, particularly in the first weeks. If you are affected, do not drive. Once stable on a dose, driving is generally fine. The drug does not impair alertness the way older tricyclic antidepressants do. If you feel slowed or your concentration is off, be cautious.
Alcohol and sertraline do not interact directly. Alcohol is not prohibited. The problem is that alcohol is a depressant. Drinking while treating depression undermines the treatment. A single drink on a social occasion is unlikely to do harm. Regular or heavy drinking impairs the brain's ability to recover and worsens sleep, which worsens depression. Keep alcohol light and intermittent.
Monoamine oxidase inhibitors, phenelzine, tranylcypromine, isocarboxazid, and moclobemide, are contraindicated with sertraline. The combination causes serotonin syndrome. A washout of at least 14 days is needed when switching from an irreversible MAOI to sertraline, and at least 7 days from sertraline to an MAOI.
Other serotonergic drugs increase the risk of serotonin syndrome. Tramadol, fentanyl, pethidine, triptans, and other antidepressants all add to the serotonin load. Mild serotonin syndrome presents with tremor, sweating, and agitation. Severe cases involve clonus, hyperthermia, and organ failure. The risk with sertraline alone is very low. The risk climbs when multiple serotonergic drugs are combined. St. John's wort is serotonergic. Do not combine it with sertraline.
NSAIDs, aspirin, and anticoagulants increase the risk of gastrointestinal bleeding. Sertraline impairs platelet aggregation by blocking serotonin uptake into platelets. For a young person on sertraline alone, the absolute risk is tiny. For an older patient on sertraline, warfarin, and ibuprofen, the risk of a significant upper GI bleed is real. A proton pump inhibitor should be considered if an NSAID is necessary. Paracetamol is safer.
CYP2C19 inhibitors, omeprazole, esomeprazole, fluconazole, can increase sertraline levels modestly. The interaction is not usually clinically significant, but if new side effects appear after starting omeprazole, the sertraline dose may need reducing. Multiple CYP pathways provide backup, which limits the impact of inhibiting a single enzyme.
Generic sertraline is the same drug at a lower cost. The switch from Zoloft to generic sertraline is routine and well-established. If a patient reports that a particular generic does not work or causes more side effects, it is worth checking adherence and other factors before attributing it to the brand. Inconsistent tablet appearance between generics can confuse patients, so using a consistent manufacturer helps.
Within SSRIs, citalopram and escitalopram are cleaner pharmacologically but carry a higher risk of QTc prolongation at high doses. Fluoxetine has a much longer half-life, reducing discontinuation symptoms but making switches slower. Paroxetine is more sedating with the highest sexual dysfunction and discontinuation burden. It is rarely the right first choice. SNRIs, venlafaxine, duloxetine, add noradrenaline reuptake inhibition. They can be more effective for some, particularly with neuropathic pain or fatigue. Mirtazapine causes weight gain and sedation, useful in an underweight, insomniac patient. Agomelatine targets melatonin receptors with no sexual side effects but needs liver monitoring. Vortioxetine has a better cognitive profile. Bupropion has no serotonergic activity and no sexual side effects, used as an add-on or alternative when SSRIs cause sexual dysfunction.
Cognitive behavioural therapy has comparable efficacy to SSRIs for mild to moderate depression. For moderate to severe depression, the combination of medication and CBT outperforms either alone. NHS talking therapies have waiting lists measured in months. Sertraline is a reasonable bridge. Structured aerobic exercise three times a week improves outcomes. It is not a replacement for medication in severe illness, but it adds something medication alone does not provide.
INN (International Nonproprietary Name): Sertraline hydrochloride
Available brand names in the UK: Zoloft, Lustral, and numerous generic sertraline products
ATC code: N06AB06
Forms and strengths: Tablets: 25 mg, 50 mg, 100 mg; Oral concentrate: 20 mg/mL
Manufacturers: Pfizer (Zoloft), and diverse generic manufacturers including Teva, Sandoz, Mylan, Accord, Zentiva, Actavis. Lustral is also manufactured by Pfizer and is effectively the same branded product under a different name.
Registration status in the UK: Registered as a Prescription Only Medicine (POM). Zoloft and generic sertraline are among the most prescribed antidepressants in the NHS.
Classification: Prescription Only Medicine (POM)
The 50 mg tablet is the starting dose for most adults. The 25 mg tablet is for titration in anxiety disorders, the elderly, and patients sensitive to serotonergic activation. The 100 mg tablet is for maintenance once the effective dose is established. A patient on 100 mg daily takes one tablet instead of two.
Zoloft and generic sertraline are bioequivalent. The brand costs more. If the patient has been stable on Zoloft and the pharmacy dispenses a generic, the clinical effect should be identical. If the patient insists on the brand, the prescription can be written as Zoloft with no substitution. The NHS typically dispenses the generic unless the brand is specified for clinical reasons. The oral concentrate is for patients needing liquid or precise dosing not achievable with tablets.
Is Zoloft the same as generic sertraline?
Yes. The active ingredient is identical. The excipients differ slightly. For most people, this makes no difference. If you have tried a generic and found it less effective or less tolerable, Zoloft is an option. The placebo effect of brand familiarity is real, and if it helps adherence, it is worth considering.
How long does Zoloft take to work?
Sleep, appetite, and energy may improve in the first week or two. Mood and anxiety take longer, 2 to 4 weeks for initial improvement and 6 to 8 weeks for full effect. Do not decide after 10 days it has failed. If there is no improvement at 4 to 6 weeks at a therapeutic dose, a dose increase or a switch is considered.
Will I feel worse before I feel better?
Some patients do. Increased anxiety, agitation, and restlessness can occur in the first week, particularly in panic disorder. Starting at 25 mg reduces this. The effect is transient, lasting days. If it is severe or accompanied by suicidal thoughts, contact your doctor immediately.
Can I stop Zoloft suddenly?
No. Discontinuation symptoms affect about 20% to 30% of patients who stop abruptly. Dizziness, brain zaps, nausea, irritability, and flu-like symptoms. These are not addiction. They are serotonin receptor adaptation. Taper over weeks to months. The longer you have been on it and the higher the dose, the slower the taper.
Will Zoloft affect my sex life?
It can. Delayed ejaculation, reduced libido, and difficulty reaching orgasm are common. They are dose-dependent. Options include reducing the dose, switching to a drug with fewer sexual side effects, adding bupropion, or a drug holiday if the condition and formulation allow. Do not stop without discussing it. Sexual dysfunction from untreated depression is also real, and it can be hard to separate the illness from the drug.
We ship Zoloft to all parts of the United Kingdom. Delivery times depend on your location:
All shipments are packed discreetly with no branding or indication of contents on the outside. At our pharmacy, you can purchase Zoloft without a prescription, with delivery across the UK.
