Consumer Medicine Information
What is in this leaflet
This leaflet answers some common questions about Pristiq.
It does not contain all the available information. It does not take the place of talking
to your doctor or pharmacist or asking questions.
All medicines have risks and benefits. Your doctor has weighed the risks of you taking
Pristiq against the expected benefits it will have for you.
If you have any questions about Pristiq, ask your doctor or pharmacist.
Keep this leaflet with your Pristiq tablets.
You may need to read it again.
What Pristiq is used for
What it does
Pristiq is used in the treatment and prevention of relapse of depression.
Depression can affect your whole body and may cause emotional and physical symptoms
such as feeling low in spirit, being unable to enjoy life, poor appetite or overeating,
disturbed sleep, loss of sex drive, lack of energy and feeling guilty over nothing.
Ask your doctor if you have any questions about why Pristiq has been prescribed for
Your doctor may have prescribed it for another reason.
How it works
Pristiq contains the active ingredient called desvenlafaxine succinate. It belongs
to a class of medications called Serotonin-Noradrenaline Reuptake Inhibitors (SNRIs).
Serotonin and noradrenaline are chemical messengers that allow certain nerves in the
brain to work. Pristiq tablets increase the level of these two messengers. Experts
think this is how it helps to restore your feeling of wellness.
Pristiq is not addictive.
It is available only with a doctor's prescription.
Use in Children
The safety and effectiveness of Pristiq in children or adolescents under 18 years
of age have not been established.
Before you take Pristiq
When you must not take it
Do not take Pristiq if you are taking other medications for depression known as monoamine
oxidase inhibitors, even if you have stopped taking them, but have taken them within
the last 14 days.
Do not take Pristiq if you are allergic to desvenlafaxine, venlafaxine or to any of
the ingredients listed at the end of this leaflet.
Symptoms of an allergic reaction include:
Itching or hives on the skin
Swelling of the face, lips, tongue, throat or other parts of the body
Shortness of breath, wheezing, troubled breathing or difficulty swallowing.
Do not take this medicine after the expiry date (EXP) printed on the pack, or if the
packaging is torn or shows signs of tampering.
If it has expired or is damaged, return it to your pharmacist for disposal.
If you are not sure whether you should start taking this medicine, talk to your doctor.
Before you start to take it
Tell your doctor or pharmacist if you have allergies to any other medicines, foods,
preservatives or dyes.
Tell your doctor or pharmacist if you are pregnant or intend to become pregnant.
Pristiq is not recommended for use during pregnancy. Your doctor will discuss the
risks and benefits of taking Pristiq if you are pregnant. One of these risks is that
newborn babies whose mothers have been taking Pristiq may have several problems including
breathing difficulties, rapid breathing, seizures, lack of oxygen in their blood,
physical and / or behavioural problems, vomiting and diarrhoea.
If you take Pristiq or similar anti-depressants mid to late in your pregnancy, you
may develop a condition known as "pre-eclampsia", which is characterised by persistent
high-blood pressure during or after pregnancy. Symptoms of pre-eclampsia can include
headaches, abdominal pain, shortness of breath or burning behind the sternum, nausea
and vomiting, confusion, heightened state of anxiety, and/or visual disturbances such
as oversensitivity to light, blurred vision, or seeing flashing spots or auras.
If you take Pristiq or similar antidepressants in the last month of your pregnancy,
you may experience heavy bleeding during and/or after delivery.
Continuing treatment with Pristiq or similar antidepressants during pregnancy should
be strictly as directed by your doctor. Symptoms of a relapse may occur if treatment
is discontinued, even if major depression was previously under control.
Tell your doctor or pharmacist if you are breast-feeding or plan to breast-feed.
Pristiq passes into breast milk and there is a possibility that the breast-fed baby
may be affected. For this reason, the use of Pristiq is not recommended in breast-feeding
Tell your doctor if you have, or have had, any medical conditions, especially the
A history of fits (seizures or convulsions)
A personal history or family history of bipolar disorder
Blood pressure problems
Glaucoma (increased pressure in the eye)
A tendency to bleed more than normal or you are taking a blood thinning medication
Raised cholesterol or lipid levels
Problems with your kidneys or liver
Problems with your heart
Low sodium levels in your blood
Any other medical conditions.
Tell your doctor if you plan to have surgery.
If you have not told your doctor about any of the above, tell them before you start
to take Pristiq.
Taking other medicines
Tell your doctor or pharmacist if you take any other medicines, including:
all prescription medicines
all medicines, vitamins, herbal supplements or natural therapies you buy without a
prescription from a pharmacy, supermarket, naturopath or health food shop, such as
St John's wort or tryptophan supplements.
Do not start to take any other medicine while you are taking Pristiq, unless it is
prescribed or approved by your doctor.
Some medicines may interfere with Pristiq or Pristiq may interfere with these medicines.
Medications for depression known as monoamine oxidase inhibitors (MAOIs) (such as
moclobemide, phenelzine and tranylcypromine). Tell your doctor if you are taking or
have stopped taking them within the last 14 days. Ask your doctor or pharmacist if
you are unsure if you are taking any of these medicines. It is important that you
do not take Pristiq or medicines similar to Pristiq with MAOIs or within 14 days of
taking an MAOI as this may result in a serious life-threatening condition. Your doctor
or pharmacist can tell you what to do if you are taking any of these medicines.
Any other medications for bipolar disorder, depression, anxiety, obsessive-compulsive
disorder or pre-menstrual dysphoric disorder, including St John's wort
Drugs that affect serotonin levels e.g. tramadol, dextromethorphan, fentanyl, methadone
Medicines used to treat Attention Deficit Hyperactivity Disorder (ADHD) such as dexamphetamine
Medicines for weight loss, including sibutramine
Triptans (used to treat migraine)
Linezolid (used to treat infections)
Drugs that affect your tendency to bleed e.g. Aspirin, NSAIDS, Warfarin.
You may need to take different amounts of your medicine, or you may need to take different
medicines. Your doctor will advise you.
Your doctor or pharmacist has more information on medicines to be careful with or
to avoid while taking Pristiq.
Switching to Pristiq from other antidepressants
Side effects from discontinuing antidepressant medication may occur if you are switched
from other antidepressants, including venlafaxine, to Pristiq. Your doctor may gradually
reduce the dose of your initial antidepressant medication to help reduce these side
How to take Pristiq
Follow all directions given to you by your doctor or pharmacist carefully.
They may differ from the information contained in this leaflet.
If you do not understand the instructions on the box, ask your doctor or pharmacist
How to take it
Swallow the tablets whole with a glass of water or other non-alcoholic liquid.
Do not divide, crush, chew or place the tablets in water.
Do not be concerned if you see a tablet 'shell' in your faeces after taking Pristiq.
As the tablet travels the length of your gastrointestinal tract, the active ingredient
desvenlafaxine is slowly released. The tablet 'shell' remains undissolved and is eliminated
in your faeces. Therefore, even though, you may see a tablet 'shell' in your faeces,
your dose of desvenlafaxine has been absorbed.
How much to take
The usual dose is 50 mg taken once daily with or without food.
Do not change your dose unless your doctor tells you to.
Your doctor will gradually increase your dose if needed.
If you have kidney problems, you may need a lower dose of Pristiq.
When to take it
Take Pristiq at approximately the same time each day.
This could be either in the morning or in the evening.
Taking it at the same time each day will have the best effect. It will also help you
remember when to take it.
How long to take it
Continue taking your medicine for as long as your doctor tells you.
Although you may begin to feel better after two weeks, it may take several weeks before
you feel much better. It is important to give Pristiq time to work.
This medicine helps to control your condition, so it is important to keep taking your
medicine even if you feel well.
If you forget to take it
If it is less than 12 hours until your next dose, skip the dose you missed and then
take your next dose when you are meant to. Otherwise, take it as soon as you remember,
and then go back to taking as you would normally.
Do not take a double dose to make up for the dose you missed.
This may increase the chance of you getting an unwanted side effect.
If you are not sure what to do, ask your doctor or pharmacist.
If you have trouble remembering when to take your medicine, ask your pharmacist for
If you take too much (overdose)
Immediately telephone your doctor or the Poisons Information Centre (telephone: 13
11 26) for advice, or go to Accident and Emergency at your nearest hospital if you
think that you or anyone else may have taken too much Pristiq.
Do this even if there are no signs of discomfort or poisoning.
You may need urgent medical attention.
Keep the telephone number for these places handy whilst taking any medications.
While you are taking Pristiq
Things you must do
Visit your doctor regularly for a check up so that your progress can be checked. Always
discuss any questions you have about Pristiq with your doctor.
Take Pristiq tablets as your doctor has prescribed.
Tell any other doctors, dentists and pharmacists who treat you that you are taking
Keep enough Pristiq tablets to last weekends and holidays.
This medicine helps to control your condition, but does not cure it. It is important
to keep taking your medicine even if you feel well.
Watch carefully for signs that your depression is getting worse, especially in the
first few weeks of treatment or if your dose has changed.
Sometimes people with depression can experience a worsening of their depressive symptoms.
This can happen even when taking an antidepressant.
Tell your doctor there is the potential for a false positive urinary drug screen while
Tell your doctor immediately if you experience any of the following symptoms, especially
if they are severe, you have not had these symptoms before or they happen very suddenly.
Anxiety or agitation
Hostility or impulsiveness
Overactivity or uninhibited behaviour
Other unusual changes in behaviour
Thoughts of suicide.
Tell your doctor immediately if you have any thoughts about suicide or doing harm
Warning signs of suicide:
If you or someone you know is showing the following warning signs, contact your doctor
or a mental health advisor right away or go to the nearest hospital for treatment.
All thoughts or talk about suicide or violence are serious.
Thoughts or talk about death or suicide
Thoughts or talk about self-harm or doing harm to others
Any recent attempts of self-harm
An increase in aggressive behaviour, irritability or agitation.
Things to be careful of
Be careful driving or operating dangerous machinery until you know how Pristiq affects
Pristiq tablets may make you feel drowsy.
Things you must not do
Do not stop taking Pristiq or change the dose without the advice of your doctor, even
if you feel better.
Your doctor may want to slowly decrease your dose of Pristiq to help avoid side effects.
Side effects are known to occur when people stop taking Pristiq, especially when they
suddenly stop therapy.
Some of these side effects include:
High blood pressure
Slowly reducing the amount of Pristiq being taken reduces the possibility of these
effects occurring. In some people this may need to occur over periods of months or
Some of these symptoms may impair driving, or the operation of dangerous machinery.
Avoid these activities if you experience any of these symptoms.
Avoid drinking alcohol while you are taking Pristiq.
Do not give this medicine to anyone else even if they have the same condition as you.
Tell your doctor or pharmacist as soon as possible if you do not feel well while you
are taking Pristiq.
All medicines can have side effects. Sometimes they are serious; often they are not.
You may need medical attention if you get some of the side effects.
It can be difficult to tell whether side effects are the result of taking this medicine,
symptoms of your condition, or side effects of other medicines you may be taking.
For this reason it is important to tell your doctor of any change in your condition.
Do not be alarmed by the list of side effects.
You may not experience any of them.
Ask your doctor or pharmacist to answer any questions you may have.
Tell your doctor if...
Tell your doctor or pharmacist if you notice any of the following and they worry you:
Stomach, bowel or urinary tract problems:
Nausea or vomiting
Loss of appetite
Difficulty passing urine
Changes in your behaviour:
Difficulty sleeping, abnormal sleepiness or abnormal dreams
Sexual function problems such as decreased sex drive, delayed ejaculation, problems
achieving erection or difficulties achieving orgasm
Nervousness or anxiety
Feeling jittery or irritable
Difficulty thinking or working because of:
Disturbances in concentration
Fainting or dizziness after standing up
Rapid heart beat
Ringing in the ears
Altered taste, dry mouth.
Tell your doctor as soon as possible if...
Tell your doctor as soon as possible if you notice any of the following:
Muscle spasms, stiffness, weakness or movement disorders
Abnormal facial movements such as tongue thrusting, repetitive chewing, jaw swinging,
A feeling of apathy or not caring about things
Feeling detached from yourself
Problems with breathing, shortness of breath
Bleeding or bruising more easily than normal
Numbness or pins and needles
Sensitivity to sunlight.
Go to hospital if...
Tell your doctor immediately, or go to Accident and Emergency at your nearest hospital
if you notice any of the following:
Palpitations, shortness of breath, intense chest pain, or irregular heartbeats
Severe upper abdominal pain
Swollen and tender abdomen
Rise or decrease in blood pressure. You may experience headache, blurred vision, palpitations,
confusion or loss of consciousness. Sometimes you may not experience any of these
symptoms. It is important to keep your routine doctor's appointments so that your
blood pressure can be checked
Swelling of the face, lips, tongue, throat or other parts of the body
Seizures or fits
Symptoms of sudden fever with sweating, rapid heartbeat and muscle stiffness, which
may lead to loss of consciousness.
Tell your doctor or pharmacist if you notice anything else that is making you feel
Other side effects not listed above may also occur in some people. Some of these side
effects (for example, increase in blood pressure, increase in blood cholesterol, changes
to liver function, protein in the urine) can only be found when your doctor does tests
from time to time to check your progress.
This is not a complete list of all possible side effects. Others may occur in some
people and there may be some side effects not yet known.
Tell your doctor if you notice anything that is making you feel unwell.
After taking Pristiq
Keep your Pristiq tablets in their blister pack until it is time to take them.
The tablets may not last as well if you take them out of the blister pack.
Keep Pristiq tablets in a cool dry place where the temperature stays below 25°C.
Do not store Pristiq tablets or any other medicine in the bathroom or near a sink.
Do not leave Pristiq tablets in the car or on windowsills.
Heat and dampness can destroy some medicines.
Keep Pristiq tablets and all medication where young children cannot reach it.
A locked cupboard, at least one-and-a-half metres above the ground, is a good place
to store medicines.
If your doctor tells you to stop taking this medicine or the expiry date has passed,
ask your pharmacist what to do with any medicine that is left over.
What Pristiq looks like
There are two strengths of Pristiq tablets:
The 50 mg tablet is a light pink, square pyramid tablet debossed with "W" (over) "50"
on the flat side.
The 100 mg tablet is a reddish-orange, square pyramid tablet debossed with "W" (over)
"100" on the flat side.
Each blister pack contains 28 tablets.
Pristiq tablets contain 50 mg or 100 mg desvenlafaxine succinate as the active ingredient.
It also contains the following inactive ingredients:
Iron oxide red
Iron oxide yellow (50 mg tablet only)
Sunset yellow FCF CI15985 (100 mg tablet only).
Pristiq does not contain gluten.
Pristiq tablets are supplied by:
Pfizer Australia Pty Ltd
Toll Free Number 1800 675 229
Australian Registration Numbers:
Pristiq 50 mg tablets: - AUST R 170674
Pristiq 100 mg tablets: - AUST R 170696
Date of Preparation
This leaflet was last revised in September 2019.
® Registered Trademark.
© Pfizer Australia Pty Ltd 2018.