Dapoxetine Explained, From How It Works to How It Is Prescribed

• Dapoxetine is the only medicine licensed in the UK specifically for premature ejaculation, and this page explains the pharmacology behind that licence rather than repeating marketing copy
• Every clinical figure here is traced to a named regulator record, and where the regulator does not publish a number we say so instead of filling the gap
• Dapoxetine is a prescription only medicine, so the page sets out exactly what a lawful supply route looks like and how to check a pharmacy is genuinely registered
• Standard website pricing for Priligy tablets is stated openly, with no urgency and no claim about being the lowest anywhere

Dapoxetine is the active substance in the only medicine licensed in the United Kingdom specifically for premature ejaculation.

Almost everything written about it online falls into one of two camps. Either it is a product page that tells you nothing about the pharmacology, or it is a general article that borrows figures from unrelated antidepressants and presents them as though they applied here. Neither helps you understand what you would actually be taking.

This page works through the substance itself: its drug class, its presumed mechanism, how quickly it is absorbed and cleared, what it is and is not licensed to treat, which patients it is contraindicated in, and what a lawful UK prescription route looks like. Where the regulator publishes a figure, that figure appears with its source named. Where the regulator does not publish one, and there are several such gaps, this page says so rather than borrowing a number from a different medicine.

Key Things to Know

• Dapoxetine is a short acting selective serotonin reuptake inhibitor, which places it in the same broad class as several antidepressants while behaving unlike them in practice.
• It is licensed in the UK for premature ejaculation in adult men aged 18 to 64 years, and for nothing else.
• Time to maximum plasma concentration after oral administration is about 1 to 2 hours, and plasma levels are less than 5% of peak by 24 hours post dose.
• Dapoxetine is a prescription-only medicine, so a legitimate UK supply requires a prescription from an authorised prescriber.
• It is contraindicated in several cardiac and mental health conditions, and must not be combined with a defined list of other medicines.
• This page contains no dosing or timing instructions. Those decisions belong to the prescriber who assesses you.

What Is Dapoxetine?

Dapoxetine is the active substance, while Priligy is the brand name of the medicine. You may therefore see both names used when looking for information about the treatment.

The Drug Class, and What Short Acting Means

NICE states the class directly in its evidence summary: dapoxetine "is a short-acting selective serotonin-reuptake inhibitor (SSRI)".

Read that slowly, because both halves carry weight. It is an SSRI, sharing a mechanism with a family most people associate with antidepressants. But it is a short acting SSRI, and that qualifier is the reason it exists as a separate product rather than being one more entry on a list of interchangeable reuptake inhibitors.

Most SSRIs are designed to build and hold a steady concentration over weeks. This one is designed to rise and fall quickly. That single difference in pharmacokinetics changes how it is prescribed, how it is taken, what side effects patients report, and which patients it suits. Everything else on this page follows from it.

What Is Dapoxetine Licensed to Treat?

NICE records the licensed indication in one line: dapoxetine "is licensed for the treatment of premature ejaculation in adult men aged 18 to 64 years".

Two limits sit inside that sentence, and both get ignored regularly in online writing.

The condition. It is licensed for premature ejaculation. It is not licensed to treat depression, anxiety, erectile dysfunction or anything else, even though other SSRIs are licensed for depression and anxiety. Membership of a drug class does not transfer an indication.

The population. Adult men aged 18 to 64 years. NICE also records that "the efficacy and safety of dapoxetine have not been established in men aged 65 years and over". That is not a warning of danger above 64. It is a statement that the evidence base does not extend there, which is a different and more honest claim.

How It Works?

Mechanism of Action

NICE describes it in careful language worth quoting rather than paraphrasing, because the caution in the wording is part of the information.

The mechanism "is presumed to be linked to the inhibition of neuronal reuptake of serotonin and the subsequent potentiation of the neurotransmitter's action at pre- and postsynaptic receptors".

Unpacking that: serotonin is a neurotransmitter released by nerve cells. Under normal conditions a transporter protein pulls it back into the releasing cell, ending the signal. SSRIs block that transporter. With reuptake inhibited, serotonin remains in the synapse longer and its action at receptors on both sides is potentiated. That is the shared mechanism across the class, and at molecular level this medicine works the same way as the SSRIs used for depression.

The word to notice is presumed. NICE does not write that this is the proven mechanism by which ejaculation is delayed. The molecular action is well characterised. The causal chain from that action to the clinical effect is an inference, and the regulator has been careful not to overstate it.

What the Regulator Does Not Say?

This is where a great deal of online writing goes wrong.

Search for the mechanism and you will find confident descriptions of where in the brain the ejaculatory pathway originates, naming structures such as the medial preoptic area and the paraventricular nuclei of the hypothalamus, and describing how the medicine acts on them.

Those descriptions come from neuroscience literature, not from the UK regulatory record for this medicine. They may well be accurate as neuroscience. What they are not is the regulator's account of how this product produces its effect, and presenting them as though they were gives them a standing they have not been granted. When a page describes the pathway in that much anatomical detail, it has moved beyond what the licence file supports.

Pharmacokinetics

Pharmacokinetics is what the body does to a medicine. Here it is the whole story, because it is what separates this medicine from every other SSRI.

Absorption

It is rapidly absorbed after oral administration. NICE records that "the time to maximum plasma concentration is about 1 to 2 hours after intake".

That is a measurement, not an instruction. It describes when concentration in blood plasma peaks after a tablet is swallowed. It is not a direction about when to take anything, and this page deliberately does not translate it into one. Timing is part of the prescriber's counselling and the patient information leaflet supplied with your pack.

Food is the practical question patients ask about rapidly absorbed medicines, because a meal can slow the rate at which a tablet reaches peak concentration. The leaflet in your pack answers that for the specific product, and a pharmacist can talk it through.

Half Life, and What the Record Actually Says?

This is one of the most searched questions about the medicine and one of the most confidently misanswered.

Here is what the UK regulatory record contains. NICE states that "plasma levels are less than 5% of peak concentrations by 24 hours post-dose". That is a clearance statement, and a strong one. Within a day of a dose, the amount circulating has fallen to a small fraction of its peak.

Here is what the record does not contain. The NICE evidence summary does not publish a terminal half life in hours. It does not publish a mean steady state volume of distribution. It does not set out the proportion of a dose recovered in urine. Those are standard parameters, they exist in the pharmaceutical literature, and they are simply not part of what the regulator has summarised publicly.

So when a page states a specific terminal half life to one decimal place, ask where it came from. A specific half-life figure therefore needs to be checked against the particular pharmacokinetic source from which it was taken, rather than being attributed to the NICE evidence summary. It may be accurate, it may be drawn from a different formulation or population, and you have no way of telling which from a number presented without a source.

Source: NICE evidence summary on dapoxetine for premature ejaculation.

Compared With Standard SSRIs

This comparison is the most useful thing to understand, because it explains why the medicine is prescribed the way it is.

Why Longer Acting SSRIs Are Taken Daily?

NICE addresses this directly: "because longer-acting SSRIs such as citalopram, fluoxetine or paroxetine have a longer onset of action than the shorter-acting dapoxetine they need to be taken on a daily basis".

That sentence contains the entire practical difference. The standard SSRIs are not slower because they are weaker. They are slower because their onset of action is longer, which means the clinical effect depends on a concentration built and held over time. To hold it, they have to be taken every day, whether or not an occasion arises.

A short acting medicine does not work that way. Concentration rises quickly and clears quickly, which is what allows it to be prescribed for use before an occasion rather than every day.

NICE also records that those longer acting SSRIs, when used for premature ejaculation, are being used outside the terms of their licences. This one is not. That is a real distinction, and a common misunderstanding, because patients often assume any SSRI prescribed for this purpose carries the same regulatory standing.

It Is Not a Treatment for Depression

Because it is an SSRI, patients reasonably ask whether it will also affect mood.

It is not licensed to treat depression. Sharing a mechanism with antidepressants does not make it an antidepressant in use, and the short acting pharmacokinetics mean it does not produce the sustained serotonin exposure that antidepressant treatment depends on.

The relationship runs the other way as well, and it matters clinically. NICE records that it is contraindicated in patients with "a history of mania or severe depression", and separately contraindicated alongside concomitant treatment with SSRIs, tricyclic antidepressants and monoamine oxidase inhibitors. A diagnosis of depression, or current antidepressant treatment, is a reason it may not be prescribed rather than a reason to consider it.

Brand, Generic and UK Availability

Tablets reach UK patients under the brand name Priligy. Dapoxetine is the active substance; Priligy is the product.

The question behind generic searches is usually a price question. A medicine marketed legally in the UK must have the appropriate UK marketing authorisation or other applicable regulatory status. The MHRA's medicines information service is the place to check the current authorisation and approved product information.

We are not going to tell you whether a non branded version is currently licensed and marketed here, because that is exactly the kind of claim that goes stale. What we can tell you is how to check, which is more durable than an answer that expires.

How to Check a Licence?

The MHRA maintains a public database of medicines with a UK marketing authorisation, searchable by active substance. Searching it for dapoxetine hydrochloride returns the licensed products and their approved documents. That is the authoritative answer at the moment you ask it, and it beats any figure written into an article months earlier.

Two practical checks follow. The pack: a medicine lawfully supplied in the UK arrives in labelled packaging with a patient information leaflet in English and a marketing authorisation number. If a tablet arrives without those, whatever the listing said, it is not a UK licensed medicine. The supplier: any legitimate supply involves a registered pharmacy and a prescriber.

Prescription Requirements

This is a prescription only medicine. There is no UK route that does not involve a prescriber assessing you, and no pharmacy counter where it can be sold without one.

What an Online Consultation Covers?

An online consultation is not a formality and not a checkout step. It is a clinical assessment carried out remotely, and here it has specific things to establish.

The prescriber needs to know whether you have any of the cardiac conditions this medicine is contraindicated in. They need your mental health history, because a history of mania or severe depression is a contraindication. They need a complete list of current medicines, including antidepressants, because several interactions are absolute. They need to know about liver and kidney function, because it is contraindicated in moderate and severe hepatic impairment. They need your age, because the licence stops at 64.

NICE also records a specific physical check expected before treatment is initiated: an assessment of blood pressure and pulse, both lying down and standing, to identify patients who react badly to a change in posture. Patients should be counselled about prodromal symptoms such as light headedness soon after standing. A consultation that establishes none of that has not done its job.

A suitably authorised prescriber assesses the patient's circumstances, considers contraindications and interactions, and decides whether treatment is appropriate within their scope of practice. The full set of licensed PE treatments is worth understanding before that conversation.

How to Verify a Pharmacy Is Registered?

Searching for somewhere to buy online returns a wide range of results, and they are not all the same kind of thing. Some are registered UK pharmacies operating lawfully. Some are not pharmacies at all.

The check takes a minute. Every pharmacy registered in Great Britain holds a GPhC registration number, and the GPhC maintains a public register you can search. EveryDayMeds is registered under number 9012878. Patients can verify the pharmacy's registration and review the information published by the GPhC rather than relying solely on information displayed on a website.

For a prescription-only medicine such as dapoxetine, a legitimate service should also involve an appropriate clinical assessment before the medicine is prescribed. Be cautious of websites that offer prescription medicines without an appropriate prescribing process, provide no independently verifiable registration information, or make claims that cannot be checked against official sources.

Price

Priligy tablets are listed on our site at a standard price of £19.79. That is the regular price, stated plainly, and it is the figure to compare against elsewhere.

We are not going to describe it as the lowest available, because we have not audited the market and no pharmacy honestly can. Price comparison for a prescription only medicine is only meaningful between suppliers actually doing the same thing. A lower headline figure from a site that skips the consultation is not a cheaper version of the same service. It is a different and unlawful one.

Side Effects

The adverse effects come from a large trial programme: five phase III randomised controlled trials involving 6,081 men, average age 41.

Recorded by Dose

Source: NICE evidence summary on dapoxetine for premature ejaculation.

Nausea was reported more frequently with 60 mg than with 30 mg in the cited trial data. Dizziness follows the same direction. NICE also records headache as very common but does not stratify it by treatment arm, so no percentage by dose can be given for it and none is estimated here.

Discontinuation for any reason across the programme was 31.1% with the active medicine and 28.9% with placebo, a narrower gap than patients often expect.

Dry mouth and diarrhoea appear frequently in general writing about SSRIs. Those are class associations rather than figures attributable here at a stated rate from this record. The complete list for the product you are dispensed is in the leaflet in the pack.

Dizziness, Fainting and the Postural Check

Syncope is rare in the recorded data, but it is the reason for the specific safety steps around this medicine.

The mechanism is a drop in blood pressure on standing. That is why NICE records a lying and standing blood pressure and pulse check before treatment is initiated, and why patients are counselled on light headedness soon after standing. NICE is also explicit that if a man has an orthostatic reaction on the lower strength, the dose should not be increased.

Anyone who feels light headed after standing should sit or lie down until it passes, and raise it with their prescriber or pharmacist before taking the medicine again. That is a safety point, not a dosing plan.

An overdose of any medicine is a medical emergency. If more than the prescribed amount is taken, seek urgent help and take the pack with you.

Contraindications

A contraindication is not a caution. It means the medicine should not be used in that situation at all.

Cardiac

NICE records contraindications including "significant pathological cardiac conditions such as heart failure, significant ischaemic heart disease or history of syncope".

Heart failure and significant ischaemic heart disease are named directly. A history of fainting is named directly. Patients often ask about implanted cardiac devices, for example whether a pacemaker rules it out. The NICE summary names conditions rather than devices, so that cannot be answered from the regulatory record and is not guessed at here. Anyone with an implanted device or significant cardiac history needs it assessed individually.

Mental Health

Contraindicated in patients with a history of mania or severe depression. This is not a minor caution buried in a leaflet. It is an absolute contraindication in the regulator record, and one of the reasons a proper consultation asks about mental health history rather than treating this as a lifestyle purchase.

If you are taking an antidepressant or receiving treatment for depression, tell the prescriber before dapoxetine is considered. Several antidepressant medicines are specifically listed among the contraindicated combinations.

Liver and Kidney

Contraindicated in men with moderate and severe hepatic impairment. For the kidney, NICE records that caution is needed in mild or moderate renal impairment and that it is not recommended in severe renal impairment.

Note the difference in wording. Moderate hepatic impairment is a contraindication. Mild or moderate renal impairment is a caution. Those are not the same instruction, and the distinction is the prescriber's to apply.

Interactions

This is where the medicine most often turns out to be unsuitable, and the part of a consultation where an incomplete answer does real harm.

Medicines That Must Not Be Combined

NICE records contraindication with "concomitant treatment with thioridazine, monoamine oxidase inhibitors, SSRIs, tricyclic antidepressants or other herbal/medicinal products with serotonergic effects and potent CYP3A4 inhibitors".

Read that list carefully, because it is broader than it first appears. Other SSRIs are on it. Tricyclic antidepressants are on it. Monoamine oxidase inhibitors are on it. Thioridazine is on it. Potent CYP3A4 inhibitors are on it, and those include medicines prescribed for reasons that have nothing to do with mood.

The phrase that catches people out is "other herbal/medicinal products with serotonergic effects". Herbal products bought without a prescription are still products with pharmacological effects, and some act on serotonin. Patients routinely leave these off a medicines list because they do not think of them as medicines. Here they belong on the list.

Combining serotonergic medicines can increase the risk of excessive serotonergic activity, including serotonin syndrome.

With Sildenafil or Tadalafil

One of the most common questions, because premature ejaculation and erectile dysfunction can occur in the same patient and the treatments are different medicines.

NICE's evidence summary states that dapoxetine should not be used in men taking PDE5 inhibitors such as sildenafil. Tadalafil is also a PDE5 inhibitor. Anyone using a PDE5 inhibitor should therefore tell the prescriber before dapoxetine is considered

If both conditions are present, that is a conversation with a prescriber who can look at the whole picture, and it may change which treatment is appropriate first. The separate ED treatments are worth reviewing, but the combination question needs a clinical answer rather than a comparison of two product pages.

Alcohol and Recreational Drugs

NICE records the position clearly: "the summary of product characteristics states that patients should be advised not to use dapoxetine in combination with recreational drugs or alcohol".

Alcohol is the one patients most often assume is a soft warning, because it appears alongside so many medicines with hedged wording. Here the advice is not hedged.

There is a plausible reason for that. The most reported adverse effects are nausea and dizziness, and syncope is the rare event driving the safety counselling.Combining a medicine associated with dizziness and fainting with a substance that affects the same systems is not a combination anyone would design deliberately. Recreational drugs sit in the same category, with the added problem that their content is unknown.

Medical Disclaimer

This page is general information, not medical advice, and contains no dosing or timing instructions. Dapoxetine is a prescription only medicine and should only be taken as directed by a prescriber after an individual assessment.

Always read the patient information leaflet supplied with your medicine. Speak to a prescriber or pharmacist about your own circumstances, and seek urgent medical help if you feel unwell after taking any medicine. Suspected side effects can be reported through the MHRA Yellow Card scheme.