Paroxetine

1. About paroxetine

Paroxetine is a type of antidepressant known as an SSRI (selective serotonin reuptake inhibitor).

It's often used to treat depression and also sometimes for obsessive compulsive disorder (OCD), panic attacks, anxiety or post-traumatic stress disorder (PTSD).

Paroxetine helps many people recover from depression, and it has fewer unwanted effects than older antidepressants.

Paroxetine is available on prescription. It comes as tablets and as a liquid that you swallow.

2. Key facts

  • It usually takes 4 to 6 weeks for paroxetine to work.
  • Side effects such as feeling sick or sexual problems are common. They are usually mild and go away after a couple of weeks.
  • Paroxetine can cause extra side effects if you stop taking it suddenly. Do not stop taking it without talking to your doctor.
  • Paroxetine is called by the brand name Seroxat.

3. Who can and can't take paroxetine

Paroxetine can be taken by adults aged 18 and over.

Check with your doctor before starting to take paroxetine if you:

  • have had an allergic reaction to paroxetine or any other medicines in the past
  • have a heart problem - as paroxetine can speed up or change your heartbeat
  • have ever taken any other medicines for depression - some rarely used antidepressants can interact with paroxetine to cause very high blood pressure, even when they have been stopped for a few weeks
  • are trying to become pregnant, are already pregnant or you are breastfeeding
  • have an eye condition called glaucoma because paroxetine can increase the pressure in your eye
  • have epilepsy or are having electroconvulsive treatment - as paroxetine may increase your seizures

If you have diabetes, paroxetine can make it more difficult to keep your blood sugar stable. Monitor your blood sugar more often for the first few weeks of treatment with paroxetine and adjust your diabetes treatment if necessary.

4. How and when to take it

Take paroxetine once a day, in the morning. It's best to take it with food so it doesn't upset your stomach.

Paroxetine tablets come in different strengths ranging from 10mg to 30mg.

How much will I take?

The dose of paroxetine that you're prescribed depends on why you are taking it. Most people will start with 10mg or 20mg. This might be gradually increased until you and your doctor agree that you have found a dose that suits you.

The maximum recommended dose of paroxetine is 50mg or 60mg, depending on why you are taking it. If you are 65 or older the maximum recommended dose is 40mg a day. If you have problems with your liver or kidneys, you may be asked to take a lower dose than usual.

With paroxetine liquid, 10ml is equivalent to a 20mg tablet.

What if I forget to take it?

If you occasionally forget to take a dose of paroxetine, don't worry. If you remember before bed, take your paroxetine straight away. If you remember during the night, or the next day, leave out the dose completely. Never take 2 doses at the same time to make up for a forgotten one.

If you forget doses often, it may help to set an alarm to remind you. You could also ask your pharmacist for advice on other ways to help you remember to take your medicine.

What if I take too much?

Ask your doctor for advice straight away. An overdose can lead to potentially serious symptoms such as:

  • being sick (vomiting)
  • shaking
  • feeling sleepy
  • fast heart rate
  • seizures
  • fever

5. Side effects

Like all medicines, paroxetine can cause side effects in some people, but many people have no side effects or only minor ones. Some of the common side effects of paroxetine will gradually improve as your body gets used to it.

Common side effects

Common side effects happen in more than 1 in 100 people. Keep taking the medicine but tell your doctor or pharmacist if these side effects bother you or don't go away:

  • less appetite than usual
  • sweating a lot
  • feeling sleepy or being unable to sleep
  • unusual dreams
  • feeling dizzy
  • headache
  • feeling like you can't concentrate
  • shaking
  • yawning
  • dry mouth
  • constipation or diarrhoea
  • feeling weak or tired
  • feeling or being sick (nausea or vomiting)
  • feeling more or less interested in sex, or having problems reaching orgasm

Serious side effects

Serious side effects are rare and happen in less than 1 in 1,000 people. Tell a doctor straight away if you get:

  • headaches, trouble focusing, memory problems, not thinking clearly, weakness, seizures or losing your balance - these can be signs of low sodium levels
  • thoughts about harming yourself or ending your life
  • restlessness or can't sit still
  • chest pain or pressure or shortness of breath
  • blurred vision
  • weight gain or loss without trying to
  • changes in your periods such as heavy bleeding, spotting or bleeding between periods
  • painful erections that last longer than 4 hours - this may happen even when you're not having sex

Or, if you develop any signs of abnormal bleeding including:

  • vomiting blood or dark vomit, coughing up blood, blood in your pee, black or red poo - these can be signs of bleeding from the gut
  • bleeding from the gums or bruises that appear without a reason or that get bigger
  • any bleeding that is very bad or that you can't stop

Serious allergic reaction

In rare cases, it's possible to have a serious allergic reaction (anaphylaxis) to paroxetine.

Contact a doctor straight away if:

  • you get a skin rash that may include itchy, red, swollen, blistered or peeling skin
  • you're wheezing
  • you get tightness in the chest or throat
  • you have trouble breathing or talking
  • your mouth, face, lips, tongue or throat start swelling

These are warning signs of a serious allergic reaction. A serious allergic reaction is an emergency.

These are not all the side effects of paroxetine. For a full list see the leaflet inside your medicines packet.

Information:

You can report any suspected side effect to the UK safety scheme.

6. How to cope with side effects

What to do about:

  • feeling sleepy - cut down the amount of alcohol you drink
  • dry mouth - chew sugar-free gum or sugar-free sweets
  • being unable to sleep - take paroxetine first thing in the morning
  • feeling sick - make sure you take paroxetine in the morning with some food
  • constipation - get more fibre into your diet such as fresh fruit and vegetables and cereals, and drink plenty of water. Try to exercise, for example, by going for a daily walk or run. If this doesn't help, talk to your pharmacist or doctor.
  • diarrhoea - drink plenty of water or other fluids. Speak to a pharmacist if you have signs of dehydration, such as peeing less than usual or having dark, strong-smelling pee. Do not take any other medicines to treat diarrhoea without speaking to a pharmacist or doctor.

Except for problems getting to sleep, you can reduce the chance of having a side effect that bothers you if you take paroxetine in the evening. That way you're asleep when the level of medicine in your body is highest.

7. Pregnancy and breastfeeding

It's important for you and your baby that you stay well during your pregnancy. If you become pregnant while taking paroxetine speak to your doctor. Do not stop taking your medicine unless your doctor tells you to.

Paroxetine has been linked to a very small increased risk of problems for your unborn baby. However if your depression is not treated during pregnancy this can also increase the chance of problems.

You may need to take paroxetine during pregnancy if you need it to remain well. Your doctor can explain the risks and the benefits, and will help you decide which treatment is best for you and your baby.

For more information about how paroxetine can affect you and your baby during pregnancy, read the leaflet about the best use of medicines in pregnancy (BUMPS).

Paroxetine and breastfeeding

If your doctor or health visitor says your baby is healthy, paroxetine can be used during breastfeeding. It has been used by many breastfeeding mothers without any problems.

Paroxetine passes into breast milk in very small amounts, and has been linked with side-effects in very few breastfed babies.

It is important to continue taking paroxetine to keep you well. Breastfeeding will also benefit both you and your baby.

If you notice that your baby isn’t feeding as well as usual, or seems unusually sleepy, or if you have any other concerns about your baby, then talk to your health visitor or doctor as soon as possible.

Tell your doctor if you're:

  • trying to get pregnant
  • pregnant
  • breastfeeding

8. Cautions with other medicines

Some medicines and paroxetine can interfere with each other and increase the chances of you having side effects.

Tell your doctor if you're taking these medicines before you start paroxetine:

  • any medicines that affect your heartbeat - as paroxetine can speed up or change your heartbeat
  • any other medicines for depression - some rarely used antidepressants can interact with paroxetine to cause very high blood pressure even when they have been stopped for a few weeks
  • any medicines for schizophrenia - some rarely used medicines for schizophrenia can interact with paroxetine to cause heart problems

Mixing paroxetine with herbal remedies and supplements

Do not take St John's wort, the herbal remedy for depression, while you are being treated with paroxetine as this will increase your risk of side effects.

Important

Tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.

9. Common questions

How does paroxetine work?

Paroxetine is one of a group of antidepressants called selective serotonin reuptake inhibitors, or SSRIs. These medicines are thought to work by increasing the levels of a mood-enhancing chemical, called serotonin, in the brain.

When will I feel better?

You may not notice much improvement in your symptoms for a week or two, until paroxetine begins to take effect. It usually takes between 4 and 6 weeks before you feel the full benefits.

Do not stop taking paroxetine after a week or two just because you feel it is not helping your symptoms. Give the medicine at least 6 weeks to work.

How will it make me feel?

Antidepressants like paroxetine help to jump start your mood so you feel better. You may notice that you sleep better and get on with people more easily because you're less anxious. You will hopefully take little things that used to worry you in your stride.

Paroxetine won't change your personality or make you feel euphorically happy. It will simply help you feel like yourself again.

Don't expect to feel better overnight though. Some people feel worse during the first few weeks of treatment before they begin to feel better.

How long will I take it for?

Once you're feeling better it's likely that you will continue to take paroxetine for several more months to prevent the symptoms returning.

You'll need to discuss with your doctor the pros and cons of carrying on taking paroxetine for longer than a few months. The decision will depend on the type and severity of your symptoms, whether it's a one-off problem or one that keeps coming back, how well paroxetine works for you and whether you've had any bad side effects.

What will happen when I stop taking paroxetine?

Some people get side effects when they stop taking paroxetine, especially if they stop taking it suddenly.

To help prevent this, your doctor might recommend reducing your dose of paroxetine gradually over several weeks.

Do not stop taking paroxetine suddenly, or without talking to your doctor.

Is it safe to take it for a long time?

Paroxetine is safe to take for a long time. There don't seem to be any lasting harmful effects from taking it for many months and years.

However, taking paroxetine for more than a year has been linked to a small increased risk of getting diabetes. But you will be regularly checked for this.

Is paroxetine better than other antidepressants?

Paroxetine isn't any better or worse as a treatment than other SSRIs.

Some side effects are more common with paroxetine than other SSRIs, like sweating or feeling sleepy. But overall, paroxetine doesn’t seem any better or worse than other SSRIs when it comes to side effects.

Sometimes people respond better to one SSRI than to another. Talk to your doctor if you aren't feeling any better after 6 weeks.

Will it affect my fertility?

There’s some evidence that paroxetine can reduce the quality of sperm. This should reverse once you stop taking the medicine.

It isn't known, however, whether this reduces male fertility. Talk to your doctor if you're concerned.

There’s no firm evidence to suggest that taking paroxetine will reduce fertility in women. However, speak to a pharmacist or your doctor if you're trying to get pregnant, as they may like to review your treatment.

Will I gain or lose weight?

Paroxetine can make you feel less hungry, so you may lose weight when you first start taking it.

Later on, you may gain a little weight as your appetite returns.

If you start to have problems with your weight while taking paroxetine, talk to your doctor or pharmacist.

Can I drive or ride a bike with it?

Some people can't concentrate properly while they're taking paroxetine. It might be best to stop driving and cycling for the first few days of treatment until you know how this medicine makes you feel.

Will it affect my contraception?

Paroxetine will not affect contraceptive pills or the morning after pill.

Will it affect my sex life?

The good effects of paroxetine may, after a while, improve your sex life as your mood lifts and you become interested in life and relationships again. Some of the possible negative effects include:

  • men getting painful erections, problems with getting an erection and problems with ejaculating
  • women having some vaginal bleeding and might not reach orgasm the same way as before
  • a lower sex drive

Sexual side effects should pass after the first couple of weeks. If they don't, and this is a problem for you, go back to your doctor to see if there's another antidepressant you can try.

Can I drink alcohol with it?

You can drink alcohol while taking paroxetine but it may make you feel sleepy. It might be best to stop drinking alcohol until you see how the medicine makes you feel.

Will recreational drugs affect it?

The sleep-inducing effects of cannabis can add to those of paroxetine, especially in people who have just started taking it. Cannabis with paroxetine can also give you a fast heartbeat.

Methadone can increase the risk of side effects in people taking paroxetine. It can be potentially dangerous to take paroxetine with:

  • stimulants like MDMA (ecstasy) or cocaine
  • hallucinogens like LSD
  • novel psychoactive substances (which used to be known as legal highs) like mephedrone

Important

Paroxetine has not been properly tested with recreational drugs. Talk to your doctor if you think you might use any recreational drugs while taking paroxetine.

Is there any food or drink I need to avoid?

There is no food or drink you need to avoid while taking paroxetine.

Are there other treatments that will help?

Antidepressants, including paroxetine, are just one of several approaches to treating depression or anxiety. Other potential treatments for depression include:

Other potential treatments for anxiety include:

Choosing a treatment that's most suitable for you depends on:

  • how long you've had depression or anxiety
  • your symptoms
  • whether previous treatment has worked
  • how likely you are to stick with your treatment
  • the potential side effects and your preferences and prioritiesIf you're interested in any of these treatments, talk to your doctor.

Page last reviewed: 23/08/2018
Next review due: 23/08/2021