January 2011 adverse event reports that FDA received in the month
What a report is
A report is not proof that the drug was the cause of the event.
FDA says:
Adverse event reports submitted to FDA do not undergo extensive validation or verification. Therefore, a causal relationship cannot be established between product and reactions listed in a report. While a suspected relationship may exist, it is not medically validated and should not be the sole source of information for clinical decision making or other assumptions about the safety or efficacy of a product. Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product.
Source: openFDA, Drug Adverse Event Overview, section "Responsible use of the data". The site read the page on . The data have the reports that FDA received through .
FDA also says:
There is no certainty that the reported event (adverse event or medication error) was actually due to the product. FDA does not require that a causal relationship between a product and event be proven, and reports do not always contain enough detail to properly evaluate an event. The information in these reports has not been scientifically or otherwise verified as to a cause and effect relationship and cannot be used to estimate the incidence of these events.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
Do not rely on openFDA to make decisions regarding medical care. While we make every effort to ensure that data is accurate, you should assume all results are unvalidated.
Source: openFDA, Response of the drug event API (meta.disclaimer). The site read the page on .
Not medical advice. This site counts what was reported to FDA. Questions about a medicine or device belong with a pharmacist or clinician.
Reports received
In January 2011, FDA received 46,519 drug adverse event reports. In January 2010, FDA received 28,744.
In January 2011, FDA received 31,574 medical device reports. In January 2010, FDA received 16,184.
By drug reports received, January 2011 was number 6 of the 12 months of 2011. FDA received 40,315 drug reports a month on average in the 12 months before January 2011.
Receive date
A month is the month in which FDA first received the report, not the month of the event. A report about an event of an earlier year is in the month in which it came to FDA.
Data version
FAERS release of 29 Oct 2026. MAUDE release of 23 Oct 2026.
Drug reports, three years
Drugs in the reports
The table has the 90 drug pages with 100 or more reports in January 2011. The rows are in order of name. A drug page with fewer reports is not in the table.
FDA says:
Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
Importantly, the AEMS data by themselves are not an indicator of the safety profile of the drug or biologic.
Source: FDA, FDA Adverse Event Monitoring System (AEMS) Public Dashboard. Content current as of . The site read the page on .
Reaction terms in the reports
The table has the 113 reaction terms with 250 or more reports in January 2011. The rows are in order of name. One report can record more than one term.
FDA says:
Additionally, it is important to remember that adverse event reports represent a small percentage of total usage numbers of a product. Common products may have a higher number of adverse events due to the higher total number of people using the product.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
Importantly, the AEMS data by themselves are not an indicator of the safety profile of the drug or biologic.
Source: FDA, FDA Adverse Event Monitoring System (AEMS) Public Dashboard. Content current as of . The site read the page on .
| Reaction term (MedDRA) and plain meaning | Reports in the month |
|---|---|
| Abdominal discomfortstomach discomfort | 311 |
| Abdominal painstomach or belly pain | 684 |
| Abdominal pain upperupper stomach pain | 506 |
| Alopeciahair loss | 341 |
| Anaemialow red blood cells | 491 |
| Anxietyanxiety | 686 |
| Arthralgiajoint pain | 1,277 |
| Astheniaweakness or lack of energy | 881 |
| Atrial fibrillationan irregular heart rhythm | 253 |
| Back painback pain | 582 |
| Balance disorderproblems with balance | 269 |
| Blood pressure increaseda raised blood pressure reading | 324 |
| Bronchitischest infection | 283 |
| Cardiac arrestthe heart stopped | 572 |
| Cardiac failure congestivecongestive heart failure | 369 |
| Cardio-respiratory arrestthe heart and breathing stopped | 318 |
| Cerebrovascular accidentstroke | 473 |
| Chest discomfortchest discomfort | 268 |
| Chest painchest pain | 609 |
| Chillschills or shivering | 365 |
| Completed suicidedeath by suicide | 1,117 |
| Condition aggravatedthe condition being treated got worse | 303 |
| Confusional stateconfusion | 396 |
| Constipationconstipation | 343 |
| Contusiona bruise | 312 |
| Convulsion | 445 |
| Coughcough | 745 |
| Crohn's diseaseCrohn's disease, an inflammatory bowel disease | 327 |
| Deaththe patient died; cause not stated by this term | 2,669 |
| Decreased appetitereduced appetite | 451 |
| Dehydrationdehydration | 338 |
| Depressionlow mood | 706 |
| Device malfunctionthe device did not work properly | 696 |
| Diarrhoealoose or frequent stools | 1,248 |
| Dizzinesslight-headedness or unsteadiness | 1,125 |
| Drug dose omissiona dose was missed | 523 |
| Drug exposure during pregnancythe medicine was taken during pregnancy | 703 |
| Drug ineffectivethe medicine did not work as expected | 2,053 |
| Drug interactionan interaction between medicines | 343 |
| Dyspepsiaindigestion | 251 |
| Dyspnoeashortness of breath | 1,412 |
| Erythemaskin redness | 481 |
| Eye irritationeye irritation | 418 |
| Falla fall | 885 |
| Fatiguetiredness | 1,659 |
| Feeling abnormalfeeling odd or not right | 471 |
| Gait disturbancedifficulty walking | 500 |
| Haemoglobin decreasedlow haemoglobin | 257 |
| Haemorrhagebleeding | 258 |
| Headachehead pain | 1,565 |
| Hyperhidrosisexcessive sweating | 329 |
| Hypersensitivityan allergic-type reaction | 360 |
| Hypertensionhigh blood pressure | 457 |
| Hypoaesthesianumbness | 518 |
| Hypotensionlow blood pressure | 469 |
| Incorrect dose administeredthe wrong dose was given | 483 |
| Incorrect route of drug administrationthe medicine was given by the wrong route | 252 |
| Infectionan infection, type not specified | 316 |
| Influenza like illnessflu-like symptoms | 347 |
| Injection site erythemaredness where the injection was given | 710 |
| Injection site haematoma | 601 |
| Injection site haemorrhagebleeding where the injection was given | 433 |
| Injection site painpain where the injection was given | 2,127 |
| Injection site pruritusitching where the injection was given | 363 |
| Injection site swellingswelling where the injection was given | 345 |
| Insomniadifficulty sleeping | 573 |
| Intentional drug misuse | 289 |
| Joint swellinga swollen joint | 328 |
| Loss of consciousnesspassing out | 392 |
| Malaisegeneral feeling of being unwell | 858 |
| Memory impairmentmemory problems | 263 |
| Multiple sclerosis relapsea flare of multiple sclerosis | 336 |
| Muscle spasmsmuscle cramps | 485 |
| Muscular weaknessmuscle weakness | 347 |
| Myalgiamuscle pain | 417 |
| Myocardial infarctionheart attack | 773 |
| Nasopharyngitisa cold | 699 |
| Nauseafeeling sick | 1,762 |
| Oedema peripheralswelling of the legs, ankles or hands | 799 |
| Oropharyngeal painsore throat | 407 |
| Overdosea dose above the recommended amount | 435 |
| Painpain, site not specified | 1,565 |
| Pain in extremitypain in an arm or leg | 876 |
| Palpitationsawareness of the heartbeat | 261 |
| Paraesthesiatingling or pins and needles | 474 |
| Pneumonialung infection | 851 |
| Poisoning | 254 |
| Product quality issuea problem with the product itself | 441 |
| Pruritusitching | 790 |
| Psoriasispsoriasis, a skin condition | 595 |
| Pulmonary embolisma blood clot in the lung | 311 |
| Pyrexiafever | 1,111 |
| Rashskin rash | 1,008 |
| Renal failurekidney failure | 366 |
| Renal failure acute | 370 |
| Respiratory arrestbreathing stopped | 396 |
| Rheumatoid arthritisrheumatoid arthritis, an inflammatory joint disease | 302 |
| Sepsisa severe body-wide response to infection | 350 |
| Sinusitissinus infection | 470 |
| Somnolencedrowsiness | 364 |
| Suicidal ideationthoughts of suicide | 331 |
| Syncopefainting | 258 |
| Thrombocytopenialow platelets | 296 |
| Toxicity to various agentspoisoning or toxic effect of one or more substances | 726 |
| Tremorshaking | 410 |
| Urinary tract infectionbladder or urinary infection | 436 |
| Urticariahives | 494 |
| Vision blurredblurred vision | 467 |
| Visual impairmentreduced vision | 321 |
| Vomitingbeing sick | 1,127 |
| Weight decreasedweight loss | 508 |
| Weight increasedweight gain | 509 |
| Wrong technique in drug usage processthe medicine was used in the wrong way | 702 |
Devices in the reports
The table has the 70 device pages with 50 or more reports in January 2011. The rows are in order of name. A device page with fewer reports is not in the table.
FDA says:
MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices.
Source: openFDA, Manufacturer and User Facility Device Experience. The site read the page on .
Cite this page
Reported Reactions. January 2011: adverse event reports received by FDA. https://reportedreactions.com/month/2011-01/ Source: U.S. Food and Drug Administration, openFDA Drug Adverse Event (FAERS) files, release of . Reports received through .
Where the data come from
The counts come from the openFDA Drug Adverse Event (FAERS) bulk files, release of 29 Oct 2026. The files have the reports that FDA received through 30 Jun 2026. A drug name is the name on the report. The site matches it to a brand name or a generic name of the National Drug Code Directory of 2 Nov 2026. A class is the pharmacologic class (EPC) of the FDA label.
The device counts come from the openFDA Device Adverse Event (MAUDE) bulk files, release of 23 Oct 2026. The files have the reports that FDA received through 30 Sep 2026. The site does not publish a report narrative, a lot number, a detail of a patient or the identity of a reporter. The record of FDA is the authority. See how the site counts reports, the data sources and the corrections page.
Questions
Can the count for January 2011 change?
Yes. FDA releases FAERS data every quarter, so the newest months are not complete. They grow in later releases. This page has the count of the openFDA release of 29 Oct 2026: 46,519 drug reports.
Does a month with many reports mean that something occurred in that month?
Not by itself. The date is the date on which FDA received the report, not the date of the event. FDA says:
Many factors can influence whether or not an event will be reported, such as the time a product has been marketed and publicity about an event.
Source: openFDA, Drug Adverse Event Overview. The site read the page on .
How does a person report an adverse event?
FDA runs MedWatch, a program that takes voluntary reports from health professionals, patients and consumers. The guide on how to report has the links.