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Generic Pristiq
Used for Depression

Desvenlafaxine, also known as the brand name Pristiq, is a medication used to treat depression in adults. It belongs to a drug class called serotonin and norepinephrine reuptake inhibitors (SNRIs). Desvenlafaxine (Pristiq) comes as a tablet that's taken by mouth once a day. Some side effects include nausea, dry mouth, and dizziness. It can also make you feel sleepy or cause trouble sleeping.

Reviewed by:Last reviewed on October 21, 2026
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What is Desvenlafaxine (Pristiq)?

What is Desvenlafaxine (Pristiq) used for?

How Desvenlafaxine (Pristiq) works

Desvenlafaxine (Pristiq) is a serotonin and norepinephrine reuptake inhibitor (SNRI). It works by raising the levels of two natural chemicals in your brain called serotonin and norepinephrine. These chemicals help regulate your mood.

When does Desvenlafaxine (Pristiq) start working?Time passed since treatment started:
HOURS
DAYS
WEEKS
Initial effect
MONTHS
Full effect

Drug facts

Common BrandsPristiq
Drug ClassSNRI
Controlled Substance ClassificationNot a controlled medication
Generic StatusLower-cost generic available
AvailabilityPrescription only
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Side effects of Desvenlafaxine (Pristiq)

The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.

Common Side Effects

  • Nausea (22%)
  • Dizziness (13%)
  • Dry mouth (11%)
  • Sweating a lot (10%)
  • Constipation (9%)
  • Trouble sleeping (9%)
  • Feeling tired (7%)
  • Low appetite (5%)
  • Sleepiness (4%)
  • Low sex drive (4%)

Less Common Side Effects

  • Vomiting
  • Blurry vision
  • Ringing in the ears (tinnitus)
  • Feeling like your surroundings are spinning (vertigo)
  • Tremors
  • Unusual dreams
  • Anxiety
  • Trouble getting or maintaining an erection (erectile dysfunction, ED)

Desvenlafaxine (Pristiq) serious side effects

Contact your healthcare provider immediately if you experience any of the following.

  • Suicidal thoughts or behavior
  • Serotonin syndrome: high fever, fast heart rate, heavy sweating, shivering, tremors, stiff muscles, restlessness, stomach upset, confusion
  • Severe bleeding or bruising: bruising that doesn't get better, black stools, pink or red urine, coughing up or vomiting blood, unusual bleeding from the nose or gums
  • Low sodium: headaches, trouble concentrating, memory problems, weakness, confusion, hallucinations
  • Seizure
When do Desvenlafaxine (Pristiq) possible side effects begin and end?
Time passed since treatment started:
H
D
W
M
Nausea
Dizziness
Dry mouth
Constipation

Source: DailyMed

The following Desvenlafaxine (Pristiq) side effects have also been reported

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

Less common

Chills

cold sweats

confusion

dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position

fast, pounding, or irregular pulse

headache

numbness or tingling in the arms or legs

shakiness in the legs, arms, hands, or feet

trouble thinking, speaking, or walking

weakness

Incidence not known

Blistering, peeling, or loosening of the skin

bloating

blood in the stool or urine

chest tightness, discomfort, or pain

cough

dark urine

diarrhea

dilated or enlarged pupils (black part of the eye)

dizziness

feeling irritated

fainting

fast, irregular, or pounding heartbeat

fever

hives, itching, or rash

hoarseness

indigestion

joint pain, stiffness, or swelling

large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or genitals

loss of appetite

loss of bladder control

muscle pain

muscle spasm or jerking of all extremities

nausea

nosebleeds

pains in the stomach, side, or abdomen, possibly radiating to the back

red skin lesions, often with a purple center

red, irritated eyes

red skin

seizures

sore throat

sores, ulcers, or white spots in the mouth or on the lips

sudden loss of consciousness

swelling of the eyelids, face, lips, hands, or feet

talking, feeling, or acting with excitement

trouble breathing or swallowing

unusual bruising

unusual tiredness or weakness

vomiting

vomiting blood

yellow eyes or skin

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

Agitation

bloating

dark urine

feeling of constant movement of self or surroundings

irregular heartbeat recurrent

light-colored stools

muscle cramp or stiffness

nausea

overactive reflexes

poor coordination

restlessness

seizures

sensation of spinning

shivering

stomach pain

vomiting

yellow eyes or skin

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Decreased appetite

inability to have an orgasm

inability to have or keep an erection

increased sensitivity of the eyes to light

loss of sexual ability, desire, drive, or performance

sleepiness or unusual drowsiness

trouble sleeping

Less common

Change in taste

continuous ringing, buzzing, or other unexplained noise in the ears

decreased weight

difficult urination

fear or nervousness

hearing loss

jitteriness

lack or loss of strength

loss of taste

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

pros-and-cons-icon

Pros and cons of Desvenlafaxine (Pristiq)

Pros

Cons

  • Can take several weeks to feel the full effects
  • Has a risk of raising blood pressure
  • Usually needs to be lowered slowly when stopping to reduce withdrawal symptoms
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Pharmacist tips for Desvenlafaxine (Pristiq)

pharmacist
  • Take desvenlafaxine (Pristiq) once a day, with or without food. You can take it at any time of the day, but try to take it around the same time each day. If it makes you feel nauseous, taking it with food might help.
  • Swallow desvenlafaxine (Pristiq) whole. Don't split, chew, crush, or dissolve the tablets. This can change how the medication gets released in your body.
  • You might notice a tablet in your stool after taking desvenlafaxine (Pristiq). This is normal. Your body has already absorbed the medication. What you're seeing is just the empty tablet shell.
  • It can take several weeks to feel the full effects of desvenlafaxine (Pristiq). You might have side effects before your mood gets better. Keep taking the medication as prescribed. Check in with your care team about how treatment is going.
  • Watch for changes in mood and behavior while taking desvenlafaxine (Pristiq). This medication can raise the risk of suicidal thoughts, especially in young adults. Tell your prescriber right away if your mood gets worse or you notice changes in how you think or act. Get emergency help right away if you think you might hurt yourself.
  • Check your blood pressure as your care team recommends. Desvenlafaxine (Pristiq) can raise your blood pressure. Tell your prescriber if your blood pressure stays higher than usual.
  • It's best to avoid alcohol while taking desvenlafaxine (Pristiq). Alcohol can make side effects, such as dizziness, worse. It might also worsen your depression symptoms. Talk to your prescriber if you have concerns about avoiding alcohol during treatment.
  • Desvenlafaxine (Pristiq) can sometimes cause sleepiness, tiredness, or blurry vision. This can make driving risky. Don't drive or use heavy machines until you know how the medication affects you.
  • Tell your prescriber and pharmacist about all the medications you take. Desvenlafaxine (Pristiq) can interact with some medications. For example, taking it with nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen (Advil) or blood thinners can raise your risk of bleeding. Taking certain other medications can raise your risk of a serious problem called serotonin syndrome. Your care team can check if your medications are safe to take together.
  • Don't suddenly stop taking desvenlafaxine (Pristiq) without talking to your prescriber first. This can cause withdrawal symptoms, such as nausea, dizziness, or trouble sleeping. Your prescriber can help you lower your dose slowly to prevent or lessen these symptoms.
  • If you're pregnant or plan to become pregnant: Tell your prescriber. Taking desvenlafaxine (Pristiq) late in pregnancy might cause problems in newborn babies, such as trouble feeding or breathing. Your prescriber can talk with you about the risks and help you choose the best treatment option. If you take desvenlafaxine (Pristiq) during pregnancy, you can join the National Pregnancy Registry for Antidepressants. This program helps researchers learn more about the safety of antidepressants during pregnancy.
  • If you're breastfeeding or plan to breastfeed: Tell your prescriber. Desvenlafaxine (Pristiq) can pass into breast milk. Your prescriber can help weigh the risks and benefits of breastfeeding during treatment. Ask your prescriber or a lactation expert about safe feeding options.
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Risks and warnings for Desvenlafaxine (Pristiq)

Desvenlafaxine (Pristiq) can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.

Risk of suicidal thoughts or behavior

  • Risk factors: Age 24 years or under | History of depression or other mental health conditions

Black Box Warning Desvenlafaxine (Pristiq) might raise the risk of suicidal thoughts or behavior, especially in people 24 years or younger. Watch for worsening depression or sudden changes in mood or behavior. This is very important during the first few months of treatment or when your dose changes.

Talk to a healthcare professional if you or someone close to you notices any unusual mood or behavior. Call 911 right away if you have thoughts of hurting yourself.

Serotonin syndrome

  • Risk factors: Taking other medications that raise serotonin levels in the brain

Desvenlafaxine (Pristiq) raises the amount of serotonin in your brain. Too much serotonin can cause a serious problem called serotonin syndrome.

Your risk is higher if you take desvenlafaxine (Pristiq) with other medications that raise serotonin. These include other antidepressants, migraine medications called triptans, and certain opioids. Tell your prescriber and pharmacist about all the medications you take. They can help check your risk.

Stop taking desvenlafaxine (Pristiq) and get medical help right away if you have signs of serotonin syndrome. These include high fever, a fast heart rate, heavy sweating, stiff muscles, or confusion.

High blood pressure

  • Risk factors: High blood pressure | Other heart problems | Blood flow problems to the brain

Desvenlafaxine (Pristiq) can raise your blood pressure. If you already have high blood pressure, talk to your prescriber before starting this medication. They can make sure it's safe for you to take.

Be sure to check your blood pressure at home often during treatment. Tell your care team if your blood pressure stays higher than usual while taking desvenlafaxine (Pristiq). They might lower your dose or have you stop taking the medication.

Higher risk of bleeding

  • Risk factors: Taking blood thinners or other medications that make bleeding or bruising easier

Desvenlafaxine (Pristiq) can raise the risk of bleeding or bruising more easily. The risk is higher if you also take other medications that have a bleeding risk. These include nonsteroidal anti-inflammatory drugs (NSAIDs) like aspirin or ibuprofen (Advil). Other medications include blood thinners like warfarin. Tell your prescriber and pharmacist about all your medications so they can monitor this risk.

Bleeding can range from nosebleeds to stomach bleeds, which can be serious and life-threatening. Tell a healthcare professional right away about any bruising that doesn't go away or bleeding that's hard to stop. Also tell them right away if you have black stools or pink or red urine. These can be signs of bleeding that could be serious.

Low sodium levels

  • Risk factors: Older adults | Medical condition called syndrome of inappropriate antidiuretic hormone (SIADH) | Taking diuretics (water pills) | Dehydrated or low fluid levels in the body

It's possible for desvenlafaxine (Pristiq) to cause low sodium levels. The risk might be higher if you're older than 65 years of age or if you take diuretics (water pills). Call your prescriber if you have symptoms of low sodium. This can include headaches, trouble concentrating, memory problems, confusion, weakness, or balance problems.

Sexual side effects

Desvenlafaxine (Pristiq) can cause sexual side effects. These include less interest in sex, trouble having an orgasm, or problems getting an erection or ejaculating.

Tell your prescriber if you notice any changes in your sex life while taking desvenlafaxine (Pristiq). These problems can also be caused by other things, like depression. Your prescriber can help find the cause and talk with you about ways to manage them.

Risk of mania

  • Risk factors: Personal or family history of mania or hypomania

It's very rare, but some people have had big changes in mood or energy while taking desvenlafaxine (Pristiq). These changes are called mania or hypomania. Tell your prescriber if you or anyone in your family has had these mood changes before, since this might raise your risk.

Signs of mania include feeling very excited, having too much energy, fast thoughts, or needing less sleep than usual. Tell your prescriber right away if you notice these signs

Lung problems and pneumonia

In rare cases, people taking venlafaxine (Effexor), a medication similar to desvenlafaxine (Pristiq), have had serious lung problems. These include certain types of lung damage and pneumonia.

Tell your prescriber right away if you have a cough, trouble breathing that gets worse, or chest discomfort while taking desvenlafaxine (Pristiq). These could be signs of a serious lung problem. Your prescriber might need to stop your medication.

Angle-closure glaucoma in certain people

  • Risk factors: Have narrow-angle eyes but haven't had laser eye surgery for it yet

Antidepressants like desvenlafaxine (Pristiq) can sometimes cause a sudden eye problem called an angle-closure attack. This is more likely in people with narrow-angle eyes who haven't had laser eye surgery. Tell your prescriber if you have this eye condition before taking desvenlafaxine (Pristiq). They can help decide if the medication is safe for you.

Call your eye specialist right away if you suddenly have blurry vision, severe eye pain, or see rings around lights. These can be signs of an angle-closure attack. This needs immediate medical care.

Withdrawal symptoms

  • Risk factors: Stopping desvenlafaxine (Pristiq) suddenly

Don't stop taking desvenlafaxine (Pristiq) suddenly without talking to your prescriber first. Stopping the medication too quickly can cause withdrawal symptoms. This can make you feel nauseous, anxious, irritable, or confused. It can also cause upset stomach, dizziness, headache, and trouble sleeping.

If you want to stop taking desvenlafaxine (Pristiq), tell your prescriber. They can help you do this safely by lowering your dose over time before you stop completely.

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Desvenlafaxine (Pristiq) dosage

The average cost for 30 tablets of 50mg of Desvenlafaxine (Pristiq) is $21.77 with a free GoodRx coupon. This is 82.62% off the average retail price of $125.23.
tabletTablet
DosageQuantityPrice as low asPrice per unit
50mg30 tablets$21.77$0.73
100mg30 tablets$24.41$0.81
25mg30 tablets$25.61$0.85

Typical dosage for Desvenlafaxine (Pristiq)

The typical dose is 50 mg by mouth once a day with or without food.

Your dose might differ if you have kidney problems.

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Interactions between Desvenlafaxine (Pristiq) and other drugs

Desvenlafaxine (Pristiq) may interact with certain medications or supplements. Always let your doctor and pharmacist know about any other medications or supplements (including prescribed and over-the-counter medications, vitamins, and dietary or herbal supplements) that you are currently taking. The list below does not include all possible drug interactions with Desvenlafaxine (Pristiq). Please note that only the generic name of each medication is listed below.

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

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How much does Desvenlafaxine (Pristiq) cost?

To access savings, use a GoodRx coupon and pay just a fraction of the retail price.
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Desvenlafaxine (Pristiq) contraindications

Contraindications are specific health conditions or situations in which a person should not take a medication due to safety concerns. If you have any of the following conditions or if any of the following apply to you, let your healthcare provider know because Desvenlafaxine (Pristiq) will not be safe for you to take.

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What are alternatives to Desvenlafaxine (Pristiq)?

There are a number of medications that your doctor can prescribe in place of Desvenlafaxine (Pristiq). Compare a few possible alternatives below.
Desvenlafaxine (Pristiq)
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$21.77Lowest GoodRx priceView prices
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$11.32Lowest GoodRx priceView prices
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$12.26Lowest GoodRx priceView prices
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News about Desvenlafaxine (Pristiq)

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Desvenlafaxine (Pristiq) images

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References

Best studies we found

American Psychological Association. (2019). APA clinical practice guideline for the treatment of depression across three age cohorts.

Khazaeni, B., et al. (2026). Acute angle-closure glaucoma. StatPearls.

Moret, C., et al. (2011). The importance of norepinephrine in depression. Neuropsychiatric Disease and Treatment.

National Alliance on Mental Illness. (2016). Desvenlafaxine (Pristiq).

Pfizer. (2011). Pristiq® (desvenlafaxine) extended-release tablets, oral [package insert].

Porter, D. (2020). Narrow angles. American Academy of Ophthalmology.

Slate Run Pharmaceuticals. (2026). Desvenlafaxine tablet, extended-release [package insert]. DailyMed.

GoodRx Health has strict sourcing policies and relies on primary sources such as medical organizations, governmental agencies, academic institutions, and peer-reviewed scientific journals. Learn more about how we ensure our content is accurate, thorough, and unbiased by reading our editorial guidelines.