Generic name
Triamterene and hydrochlorothiazide: adverse event reports filed with FDA
723 reports list it as a suspect or interacting product, 2004–2026. Also reported as Triamterene/Hydrochlorothiazide, Triamterene And Hydrochlorothiazide Tablets Usp, Triamterene And Hydrochlorothiazide Capsules.
- 723
- reports as suspect product
- 0% of all reports · about 32 a year
- 5
- reports, 12 months to June 2026
- 14 in the 12 months before
- 56.4%
- marked serious by the reporter
- 57.4% across all reports
- 8.4%
- record death among outcomes, as reported
- 61 reports · not verified by FDA
Between January 2004 and June 2026, 723 adverse event reports received by FDA list triamterene and hydrochlorothiazide, a generic name as a suspect or interacting product. Reports that mention it only as a concomitant medication (5,859) are left out of every figure here.
In the 12 months to June 2026, 5 reports listed it, down 64% from 14 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 32 reports a year and 0% of the 20,646,523 reports in the database. 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 (9.3%), completed suicide (6.1%) and hyponatraemia (5.3%). A report can list several reactions, so shares add to more than 100%; 192 different terms appear across these reports. Drug ineffective is recorded in 9.3% of these reports, against 6.3% of all reports in the database.
56.4% of the reports are marked serious by the reporter; 8.4% record death among the outcomes and 28.1% record hospitalisation, as reported. 43.3% of the reports came from consumers, and the largest patient age group is 45 to 64 (27.1%). 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 Triamterene and hydrochlorothiazide reports recording the termall reports in the database
- Drug ineffectivethe medicine did not work as expected9.3%67
- Completed suicidedeath by suicide6.1%44
- Hyponatraemialow blood sodium5.3%38
- Dizzinesslight-headedness or unsteadiness4.7%34
- Muscle spasmsmuscle cramps3.2%23
- Product substitution issuea problem after switching products3.2%23
- Renal failure acute3.2%23
- Rashskin rash2.6%19
- Astheniaweakness or lack of energy2.5%18
- Blood pressure increaseda raised blood pressure reading2.5%18
- Dyspnoeashortness of breath2.4%17
- Hypotensionlow blood pressure2.4%17
- Feeling abnormalfeeling odd or not right2.2%16
- Hypokalaemialow blood potassium2.2%16
- Nauseafeeling sick2.2%16
- Abdominal painstomach or belly pain2.1%15
- Diarrhoealoose or frequent stools2.1%15
- Headachehead pain2.1%15
- Hyperkalaemiahigh blood potassium2.1%15
- Abdominal distensiona bloated abdomen1.9%14
- Drug hypersensitivityan allergic-type reaction to a medicine1.8%13
- Hypertensionhigh blood pressure1.8%13
- Peripheral swellingswelling of the arms or legs1.8%13
- Pruritusitching1.7%12
- Acute kidney injurysudden loss of kidney function1.5%11
- Oedemaswelling from fluid1.5%11
- Condition aggravatedthe condition being treated got worse1.4%10
- Drug interactionan interaction between medicines1.4%10
- Oedema peripheralswelling of the legs, ankles or hands1.4%10
- Weight increasedweight gain1.4%10
Top 30 of 192 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 share of all reports in the database; 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 20,646,523 reports. 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. 87.3% of reports give the United States as the country of the event or reporter.
Reason for use recorded
| Indication as recorded (MedDRA) | Reports | Share |
|---|---|---|
| Hypertension | 179 | 24.8% |
| Blood pressure increased | 13 | 1.8% |
| Fluid retention | 12 | 1.7% |
| Blood pressure | 6 | 0.8% |
| Blood pressure abnormal | 5 | 0.7% |
| Blood pressure measurement | 5 | 0.7% |
The indication field is filled in by the reporter and is often blank; shares are of all 723 reports.
In context
| Measure | Triamterene and hydrochlorothiazide | All reports |
|---|---|---|
| Reports as suspect product | 723 | 20,646,523 |
| Share of that pool | — | 0% |
| Reports, latest 12 months | 5 | 1,332,454 |
| Marked serious | 56.4% | 57.4% |
| Death recorded among outcomes, per 1,000 reports | 84 | 91 |
| Hospitalisation recorded, per 1,000 reports | 281 | 213 |
| Consumer-filed share | 43.3% | 45.8% |
| Top term, share of reports | Drug ineffective 9.3% | 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."
Questions about Triamterene and hydrochlorothiazide reports
How many adverse event reports has FDA received for Triamterene and hydrochlorothiazide?
723 reports list Triamterene and hydrochlorothiazide as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 5 of them arrived in the latest 12 months. Another 5,859 list it only as a concomitant medication.
What reactions are recorded in Triamterene and hydrochlorothiazide reports?
drug ineffective (9.3%), completed suicide (6.1%), hyponatraemia (5.3%), dizziness (4.7%) and muscle spasms (3.2%). 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 Triamterene and hydrochlorothiazide was responsible.
How serious are the reports?
56.4% are marked serious by the reporter. Among the outcomes recorded, 8.4% of reports include death and 28.1% 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 (43.3%), physician (20.3%) and pharmacist (15.9%). Most reports reach FDA through the manufacturer, which must forward reports it receives.
Are reports for Triamterene and hydrochlorothiazide rising?
5 reports in the 12 months to June 2026, down 64% from 14 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 Triamterene and hydrochlorothiazide 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 Triamterene and hydrochlorothiazide?
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 Triamterene and hydrochlorothiazide as a suspect or interacting product; reports listing it only as a concomitant medication (5,859) 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.