Drugs › Phosphodiesterase 5 inhibitor
Generic name
Sildenafil: adverse event reports filed with FDA
10,726 reports list it as a suspect or interacting product, 2004–2026. Class: Phosphodiesterase 5 inhibitor. Also reported as Sildenafil Tablet, Sildenafil Tablets, Sildenafil 20mg.
- 10,726
- reports as suspect product
- 0.1% of all reports · about 477 a year
- 1,014
- reports, 12 months to June 2026
- 904 in the 12 months before
- 82.6%
- marked serious by the reporter
- 60.1% across the class
- 18.5%
- record death among outcomes, as reported
- 1,988 reports · not verified by FDA
10,726 adverse event reports received by FDA list sildenafil, a generic name as a suspect or interacting product, from January 2004 to June 2026. A further 25,946 reports list it only as a concomitant medication, and those are not counted in the figures on this page.
In the 12 months to June 2026, 1,014 reports listed it, up 12% from 904 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 477 reports a year and 0.1% of the 20,646,523 reports in the database, and 11.6% of the reports for the phosphodiesterase 5 inhibitor class. How many people take it is not in the data, so a count is not a rate of occurrence.
Reporters most often recorded drug ineffective (11.4%), death (8.1%) and dyspnoea (7.3%). A report can list several reactions, so shares add to more than 100%; 1,415 different terms appear across these reports. Drug ineffective is recorded in 11.4% of these reports, about the same share as in the median phosphodiesterase 5 inhibitor drug (11.4%).
82.6% of the reports are marked serious by the reporter (60.1% across the class); 18.5% record death among the outcomes and 38.5% record hospitalisation, as reported. 39.8% of the reports came from other health professionals, and the largest patient age group is 45 to 64 (23.8%). 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
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
2026 covers reports received through June 2026 only.
Reactions recorded in the reports
share of Sildenafil reports recording the termmedian drug in phosphodiesterase 5 inhibitor
- Drug ineffectivethe medicine did not work as expected11.4%1,228
- Deaththe patient died; cause not stated by this term8.1%872
- Dyspnoeashortness of breath7.3%786
- Headachehead pain6.2%661
- Off label useused for a purpose or in a way not on the label5.9%636
- Hypotensionlow blood pressure3.9%416
- Condition aggravatedthe condition being treated got worse3.8%411
- Nauseafeeling sick3.5%379
- Dizzinesslight-headedness or unsteadiness3.4%367
- Fatiguetiredness2.9%313
- Diarrhoealoose or frequent stools2.7%286
- Pneumonialung infection2.6%279
- Hospitalisationadmission to hospital2.6%274
- Premature babya baby born early2.5%265
- Foetal exposure during pregnancythe unborn baby was exposed to the medicine2.4%261
- Drug interactionan interaction between medicines2.2%234
- Vomitingbeing sick2.1%230
- Drug abusemisuse of a medicine2.1%227
- Pulmonary hypertensionhigh pressure in the lung arteries2%219
- Toxicity to various agentspoisoning or toxic effect of one or more substances2%218
- Cardiac failureheart failure1.9%203
- Premature delivery1.8%195
- Pulmonary oedemafluid in the lungs1.8%190
- Right ventricular failure1.8%190
- Malaisegeneral feeling of being unwell1.7%185
- Painpain, site not specified1.7%182
- Fluid retentionthe body holding extra fluid1.7%179
- Flushingsudden reddening or warmth of the skin1.7%179
- Syncopefainting1.7%179
Top 30 of 1,415 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 7 drugs in the phosphodiesterase 5 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
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 92,849 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
Patient sex
Who reported
Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 51.5% of reports give the United States as the country of the event or reporter.
Reason for use recorded
| Indication as recorded (MedDRA) | Reports | Share |
|---|---|---|
| Pulmonary arterial hypertension | 2,057 | 19.2% |
| Pulmonary hypertension | 1,329 | 12.4% |
| Erectile dysfunction | 1,118 | 10.4% |
| Foetal growth restriction | 79 | 0.7% |
| Weight decreased | 65 | 0.6% |
| Raynaud's phenomenon | 61 | 0.6% |
The indication field is filled in by the reporter and is often blank; shares are of all 10,726 reports.
Drugs most often listed in the same reports
| Drug (any role in the report) | Reports | Share of Sildenafil reports |
|---|---|---|
| Ambrisentan | 907 | 8.5% |
| Opsumit | 839 | 7.8% |
| Furosemide | 712 | 6.6% |
| Bosentan | 534 | 5% |
| Aspirin | 411 | 3.8% |
| Spironolactone | 407 | 3.8% |
| Metformin | 393 | 3.7% |
| Nifedipine | 386 | 3.6% |
| Remodulin | 375 | 3.5% |
| Omeprazole | 342 | 3.2% |
Other products listed in reports where Sildenafil 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
| Measure | Sildenafil | Phosphodiesterase 5 inhibitor | All reports |
|---|---|---|---|
| Reports as suspect product | 10,726 | 92,849 | 20,646,523 |
| Share of that pool | — | 11.6% | 0.1% |
| Reports, latest 12 months | 1,014 | — | 1,332,454 |
| Marked serious | 82.6% | 60.1% | 57.4% |
| Death recorded among outcomes, per 1,000 reports | 185 | 129 | 91 |
| Hospitalisation recorded, per 1,000 reports | 385 | 228 | 213 |
| Consumer-filed share | 25.5% | 56.3% | 45.8% |
| Top term, share of reports | Drug ineffective 11.4% | median 11.4% | 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 phosphodiesterase 5 inhibitor class
| Drug | Name type | Reports | Latest 12 months | Marked serious |
|---|---|---|---|---|
| Viagra | brand | 28,349 | 44 | 46% |
| Cialis | brand | 15,166 | 81 | 35.6% |
| Adcirca | brand | 12,214 | 294 | 66.7% |
| Tadalafil | generic | 10,660 | 1,519 | 76.1% |
| Revatio | brand | 9,801 | 77 | 83% |
| Sildenafil citrate | generic | 5,933 | 282 | 69.1% |
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 Sildenafil reports
How many adverse event reports has FDA received for Sildenafil?
10,726 reports list Sildenafil as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 1,014 of them arrived in the latest 12 months. Another 25,946 list it only as a concomitant medication.
What reactions are recorded in Sildenafil reports?
drug ineffective (11.4%), death (8.1%), dyspnoea (7.3%), headache (6.2%) and off label use (5.9%). 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 Sildenafil was responsible.
How serious are the reports?
82.6% are marked serious by the reporter. Among the outcomes recorded, 18.5% of reports include death and 38.5% 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?
other health professional (39.8%), consumer or non-health professional (25.5%) and physician (18.9%). Most reports reach FDA through the manufacturer, which must forward reports it receives.
Are reports for Sildenafil rising?
1,014 reports in the 12 months to June 2026, up 12% from 904 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 Sildenafil 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 Sildenafil?
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 Sildenafil as a suspect or interacting product; reports listing it only as a concomitant medication (25,946) 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.