Product name as reported
Alendronic Acid: adverse event reports filed with FDA
9,665 reports list it as a suspect or interacting product, 2004–2026. Also reported as Alendronic Acid /01220302/.
- 9,665
- reports as suspect product
- 0.1% of all reports · about 443 a year
- 1,405
- reports, 12 months to June 2026
- 1,746 in the 12 months before
- 98.4%
- marked serious by the reporter
- 57.4% across all reports
- 38.3%
- record death among outcomes, as reported
- 3,706 reports · not verified by FDA
9,665 adverse event reports received by FDA list the product name "Alendronic Acid" as reporters wrote it as a suspect or interacting product, from September 2004 to June 2026. A further 8,737 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, 1,405 reports listed it, down 20% from 1,746 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 443 reports a year and 0.1% 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.
The MedDRA terms listed most often are fatigue (28.3%), pain (26.1%) and rheumatoid arthritis (25.9%). A report can list several reactions, so shares add to more than 100%; 1,206 different terms appear across these reports. Fatigue is recorded in 28.3% of these reports, against 3.7% of all reports in the database.
98.4% of the reports are marked serious by the reporter; 38.3% record death among the outcomes and 50.4% record hospitalisation, as reported. 63.4% of the reports came from other health professionals, and the largest patient age group is 18 to 44 (29.8%). 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 Alendronic Acid reports recording the termall reports in the database
- Fatiguetiredness28.3%2,733
- Painpain, site not specified26.1%2,521
- Rheumatoid arthritisrheumatoid arthritis, an inflammatory joint disease25.9%2,508
- Glossodynia25.9%2,507
- Rashskin rash25.3%2,443
- Off label useused for a purpose or in a way not on the label25.1%2,430
- Systemic lupus erythematosuslupus, an autoimmune disease24.8%2,400
- Alopeciahair loss24.6%2,378
- Abdominal discomfortstomach discomfort24.6%2,373
- Arthralgiajoint pain24.4%2,363
- Hand deformity24.3%2,344
- Pemphigus23.4%2,266
- Infusion related reactiona reaction during or soon after an infusion23%2,224
- Swellingswelling22.9%2,216
- Wound22.9%2,213
- Drug ineffectivethe medicine did not work as expected22.9%2,210
- Joint swellinga swollen joint22.7%2,196
- Arthropathy22.4%2,164
- Synovitis22.1%2,140
- Maternal exposure during pregnancythe mother took the medicine during pregnancy21.3%2,059
- Pericarditisinflammation of the sac around the heart20.9%2,019
- Hypersensitivityan allergic-type reaction20.7%1,997
- Helicobacter infection20.5%1,981
- Duodenal ulcer perforation20.5%1,980
- General physical health deteriorationgeneral decline in health20.4%1,974
- Hepatic enzyme increasedraised liver enzymes20.3%1,961
- Psoriatic arthropathy20.1%1,942
- Condition aggravatedthe condition being treated got worse19.6%1,896
- Drug intolerancethe medicine was not tolerated19.6%1,893
- Headachehead pain19.3%1,869
Top 30 of 1,206 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. 4.9% of reports give the United States as the country of the event or reporter.
Reason for use recorded
| Indication as recorded (MedDRA) | Reports | Share |
|---|---|---|
| Rheumatoid arthritis | 3,586 | 37.1% |
| Osteoporosis | 1,728 | 17.9% |
| Osteoporosis prophylaxis | 157 | 1.6% |
| Osteoporosis postmenopausal | 101 | 1% |
| Osteopenia | 100 | 1% |
| Foetal exposure during pregnancy | 91 | 0.9% |
The indication field is filled in by the reporter and is often blank; shares are of all 9,665 reports.
Drugs most often listed in the same reports
| Drug (any role in the report) | Reports | Share of Alendronic Acid reports |
|---|---|---|
| Prednisone | 4,453 | 46.1% |
| Methotrexate | 4,377 | 45.3% |
| Folic acid | 4,233 | 43.8% |
| Rituximab | 4,203 | 43.5% |
| Diclofenac sodium | 3,986 | 41.2% |
| Sulfasalazine | 3,977 | 41.1% |
| Leflunomide | 3,885 | 40.2% |
| Desoximetasone | 3,767 | 39% |
| Cimzia | 3,746 | 38.8% |
| Enbrel | 3,694 | 38.2% |
Other products listed in reports where Alendronic Acid 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 | Alendronic Acid | All reports |
|---|---|---|
| Reports as suspect product | 9,665 | 20,646,523 |
| Share of that pool | — | 0.1% |
| Reports, latest 12 months | 1,405 | 1,332,454 |
| Marked serious | 98.4% | 57.4% |
| Death recorded among outcomes, per 1,000 reports | 383 | 91 |
| Hospitalisation recorded, per 1,000 reports | 504 | 213 |
| Consumer-filed share | 13.6% | 45.8% |
| Top term, share of reports | Fatigue 28.3% | 3.7% |
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 Alendronic Acid reports
How many adverse event reports has FDA received for Alendronic Acid?
9,665 reports list Alendronic Acid as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 1,405 of them arrived in the latest 12 months. Another 8,737 list it only as a concomitant medication.
What reactions are recorded in Alendronic Acid reports?
fatigue (28.3%), pain (26.1%), rheumatoid arthritis (25.9%), glossodynia (25.9%) and rash (25.3%). 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 Alendronic Acid was responsible.
How serious are the reports?
98.4% are marked serious by the reporter. Among the outcomes recorded, 38.3% of reports include death and 50.4% 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 (63.4%), physician (15.4%) and consumer or non-health professional (13.6%). Most reports reach FDA through the manufacturer, which must forward reports it receives.
Are reports for Alendronic Acid rising?
1,405 reports in the 12 months to June 2026, down 20% from 1,746 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 Alendronic Acid 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 Alendronic Acid?
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 Alendronic Acid as a suspect or interacting product; reports listing it only as a concomitant medication (8,737) 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.