Reported Reactions

Drugs › Serotonin and norepinephrine reuptake inhibitor

Brand name · Desvenlafaxine succinate

Pristiq: adverse event reports filed with FDA

5,941 reports list it as a suspect or interacting product, 2008–2026. Class: Serotonin and norepinephrine reuptake inhibitor. Also reported as Pristiq Extended Release, Pristiq Er, Pristiq Sr.

5,941
reports as suspect product
0% of all reports · about 333 a year
81
reports, 12 months to June 2026
127 in the 12 months before
41.8%
marked serious by the reporter
66.4% across the class
2.5%
record death among outcomes, as reported
149 reports · not verified by FDA

Between September 2008 and June 2026, 5,941 adverse event reports received by FDA list the brand name Pristiq (desvenlafaxine succinate) as a suspect or interacting product. Reports that mention it only as a concomitant medication (6,666) are left out of every figure here.

In the 12 months to June 2026, 81 reports listed it, down 36% from 127 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Over its reporting history that is about 333 reports a year and 0% of the 20,646,523 reports in the database, and 3.5% of the reports for the serotonin and norepinephrine reuptake inhibitor class. How many people take it is not in the data, so a count is not a rate of occurrence.

The reactions recorded most often are drug ineffective (11.7%), feeling abnormal (9.1%) and anxiety (8.1%). A report can list several reactions, so shares add to more than 100%; 643 different terms appear across these reports. Drug ineffective is recorded in 11.7% of these reports, about the same share as in the median serotonin and norepinephrine reuptake inhibitor drug (10.4%).

41.8% of the reports are marked serious by the reporter (66.4% across the class); 2.5% record death among the outcomes and 9.2% record hospitalisation, as reported. 69% of the reports came from consumers, and the largest patient age group is 45 to 64 (30.6%). FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."

Reports by month, five years

03774Jul 2021: 18Aug 2021: 24Sep 2021: 33Oct 2021: 27Nov 2021: 14Dec 2021: 252022Jan 2022: 32Feb 2022: 30Mar 2022: 35Apr 2022: 36May 2022: 74Jun 2022: 23Jul 2022: 24Aug 2022: 22Sep 2022: 22Oct 2022: 22Nov 2022: 17Dec 2022: 262023Jan 2023: 21Feb 2023: 18Mar 2023: 14Apr 2023: 10May 2023: 17Jun 2023: 17Jul 2023: 19Aug 2023: 18Sep 2023: 14Oct 2023: 16Nov 2023: 10Dec 2023: 62024Jan 2024: 10Feb 2024: 4Mar 2024: 11Apr 2024: 11May 2024: 7Jun 2024: 17Jul 2024: 12Aug 2024: 12Sep 2024: 5Oct 2024: 14Nov 2024: 12Dec 2024: 62025Jan 2025: 11Feb 2025: 9Mar 2025: 14Apr 2025: 11May 2025: 14Jun 2025: 7Jul 2025: 8Aug 2025: 8Sep 2025: 9Oct 2025: 15Nov 2025: 5Dec 2025: 52026Jan 2026: 4Feb 2026: 5Mar 2026: 5Apr 2026: 10May 2026: 6Jun 2026: 1

Reports by the month FDA received them. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.

By year received

05011,0022008: 220082009: 12010: 120102011: 82012: 2120122013: 312014: 52920142015: 9352016: 1,00220162017: 7042018: 45620182019: 5112020: 62420202021: 3052022: 36320222023: 1802024: 12120242025: 1162026: 312026

2026 covers reports received through June 2026 only.

Reactions recorded in the reports

share of Pristiq reports recording the termmedian drug in serotonin and norepinephrine reuptake inhibitor

  1. Drug ineffectivethe medicine did not work as expected11.7%694
  2. Feeling abnormalfeeling odd or not right9.1%539
  3. Anxietyanxiety8.1%479
  4. Dizzinesslight-headedness or unsteadiness7.7%460
  5. Nauseafeeling sick7.4%438
  6. Malaisegeneral feeling of being unwell6.9%409
  7. Headachehead pain6.4%383
  8. Depressionlow mood6.4%381
  9. Insomniadifficulty sleeping4.9%294
  10. Suicidal ideationthoughts of suicide4.8%283
  11. Drug withdrawal syndromesymptoms on stopping a medicine4.7%280
  12. Off label useused for a purpose or in a way not on the label4.5%266
  13. Fatiguetiredness4.4%261
  14. Intentional product misusedeliberate use not as intended4%236
  15. Cryingcrying3.8%228
  16. Painpain, site not specified3.4%202
  17. Condition aggravatedthe condition being treated got worse3.2%192
  18. Hyperhidrosisexcessive sweating2.9%174
  19. Drug hypersensitivityan allergic-type reaction to a medicine2.9%170
  20. Drug dependencedependence on a medicine2.8%164
  21. Irritabilityirritability2.7%163
  22. Tremorshaking2.7%158
  23. Vomitingbeing sick2.6%152
  24. Paraesthesiatingling or pins and needles2.5%148
  25. Weight increasedweight gain2.3%137
  26. Memory impairmentmemory problems2.3%136
  27. Diarrhoealoose or frequent stools2.2%133
  28. Nervousnessnervousness2.2%131
  29. Somnolencedrowsiness2.1%125

Top 30 of 643 MedDRA preferred terms recorded across these reports, with a plain-language gloss where one is available. One report can record several terms. The hollow bar is the median share across the 12 drugs in the serotonin and norepinephrine reuptake inhibitor class; it describes the reports, not the patients. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Outcomes recorded

Death2.5%149
Life-threatening1.3%75
Hospitalisation (initial or prolonged)9.2%549
Disability1.9%115
Congenital anomaly0.2%14
Other serious34%2,019
Not serious58.2%3,457

Outcome flags as the reporter set them; a report can carry several, and "other serious" is FDA's own category for serious reports outside the named outcomes. Grey bar: all 171,115 reports in the class. FDA has not verified any outcome and states that the reports "cannot be used to estimate the incidence of these events."

Patients and reporters

Patient age

Under 20.2%13
2 to 110.4%23
12 to 170.9%53
18 to 4415.2%902
45 to 6430.6%1,819
65 to 7412.5%743
75 and over5.7%339
Age not given34.5%2,049

Patient sex

Female69.5%4,130
Male19.2%1,142
Not given11.3%669

Who reported

Physician15%890
Pharmacist2.4%144
Other health professional11.9%709
Lawyer0.1%8
Consumer or non-health professional69%4,100
Not given1.5%90

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 84.8% of reports give the United States as the country of the event or reporter.

Reason for use recorded

Indication as recorded (MedDRA)ReportsShare
Depression1,48825%
Anxiety3385.7%
Major depression2133.6%
Bipolar disorder741.2%
Generalised anxiety disorder280.5%
Antidepressant therapy270.5%

The indication field is filled in by the reporter and is often blank; shares are of all 5,941 reports.

Drugs most often listed in the same reports

Drug (any role in the report)ReportsShare of Pristiq reports
Lyrica1642.8%
Abilify1602.7%
Bupropion hydrochloride1382.3%
Klonopin1312.2%
Clonazepam1272.1%
Xanax1162%
Lisinopril1131.9%
Trazodone1121.9%
Lamictal1091.8%
Seroquel1051.8%

Other products listed in reports where Pristiq is a suspect product, whatever their own role. Co-listing means the two were recorded together; it says nothing about either product's part in the event. Only the 2,500 most-reported names are counted here.

In context

MeasurePristiqSerotonin and norepinephrine reuptake inhibitorAll reports
Reports as suspect product5,941171,11520,646,523
Share of that pool—3.5%0%
Reports, latest 12 months81—1,332,454
Marked serious41.8%66.4%57.4%
Death recorded among outcomes, per 1,000 reports2510291
Hospitalisation recorded, per 1,000 reports92241213
Consumer-filed share69%41.4%45.8%
Top term, share of reportsDrug ineffective 11.7%median 10.4%6.3%

Shares are of reports, not of patients treated. The number of people taking a product is not in the data, so none of these figures is a rate, and differences between columns reflect who takes a product, who reports and how long it has been sold. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Other drugs in the serotonin and norepinephrine reuptake inhibitor class

DrugName typeReportsLatest 12 monthsMarked serious
Cymbaltabrand52,27934652.3%
Venlafaxinegeneric29,7522,34593.8%
Venlafaxine hydrochloridegeneric19,4641,02680%
Duloxetinegeneric16,1031,52985.5%
Effexorbrand13,0793660.1%
Desvenlafaxine succinategeneric12,4145929.6%
Venlafaxine hclgeneric8,4011567.3%
Duloxetine hydrochloridegeneric8,24578782.5%
Savellabrand2,9093429.4%
Desvenlafaxinegeneric1,43613578.9%
Fetzimabrand1,0927553.1%

Ordered by report count for navigation only. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic." A brand and its generic are separate rows because reporters name them separately.

Questions about Pristiq reports

How many adverse event reports has FDA received for Pristiq?

5,941 reports list Pristiq as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 81 of them arrived in the latest 12 months. Another 6,666 list it only as a concomitant medication.

What reactions are recorded in Pristiq reports?

drug ineffective (11.7%), feeling abnormal (9.1%), anxiety (8.1%), dizziness (7.7%) and withdrawal syndrome (7.4%). These are MedDRA preferred terms coded from what the reporter described; a report can list several, and a term's presence is not a finding that Pristiq was responsible.

How serious are the reports?

41.8% are marked serious by the reporter. Among the outcomes recorded, 2.5% of reports include death and 9.2% include hospitalisation. FDA has not verified these outcomes and states that the reports "cannot be used to estimate the incidence" of the events.

Who files these reports?

consumer or non-health professional (69%), physician (15%) and other health professional (11.9%). Most reports reach FDA through the manufacturer, which must forward reports it receives.

Are reports for Pristiq rising?

81 reports in the 12 months to June 2026, down 36% from 127 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Counts also move with how many people take a product, its time on the market and publicity.

Do these reports show that Pristiq was responsible for these reactions?

No. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event." The reaction may relate to the condition being treated, to other medicines, or to something else.

Is this a list of the side effects of Pristiq?

No. It is a count of what was reported to FDA. The adverse reactions observed in clinical studies are printed on the FDA-approved label, which a pharmacist or clinician can go through with you.

How do I report an adverse event?

Consumers and health professionals can report to FDA through MedWatch (Form FDA 3500 online, or 1-800-FDA-1088), or to the manufacturer, which must pass reports on. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Drug Adverse Event (FAERS) bulk export released 28 Sep 2026, which holds reports FDA received through 30 Jun 2026. Drug names are as reported, resolved to the brand or generic name on the FDA label where openFDA's harmonisation matched them; classes are the pharmacologic class (EPC) from the label and the National Drug Code Directory of 17 Sep 2026. A report counts here when it lists Pristiq as a suspect or interacting product; reports listing it only as a concomitant medication (6,666) are excluded. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.