Delusion adverse event reports that record this term

Kind of term: MedDRA preferred term
Plain meaning: a fixed false belief

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 2 Oct 2026. The data have the reports that FDA received through 30 Jun 2026.

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 2 Oct 2026.

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 2 Oct 2026.

Not medical advice. This site counts what was reported to FDA. Questions about a medicine or device belong with a pharmacist or clinician.

Reports on file

From January 2004 to June 2026, FDA received 15,237 adverse event reports that record the MedDRA preferred term Delusion. In plain words, the term means: a fixed false belief. The person who codes a report selects the term that agrees best with the description of the reporter.

FDA received 956 reports in the 12 months to June 2026 and 1,035 in the 12 months before. FDA releases FAERS data every quarter, so the newest months are not complete. They grow in later releases.

By reports in the 12 months to June 2026, this term was number 634 of 1,436 reaction terms with a page. Of the 1,332,454 drug reports that FDA received in the 12 months to June 2026, 956 (0.1%) record this term. Reports for male patients were 49.4% of the reports that record this term and 34.6% of all drug reports.

The number of people who use the product is not in the data. A count is not a rate.

MedDRA

The Medical Dictionary for Regulatory Activities. The person who codes a report selects the preferred term that agrees best with the description of the reporter. FDA does not publish the description.

Plain meaning

A fixed false belief. The words are from the fixed dictionary of this site. They add nothing to a report.

Data version

openFDA FAERS release of 29 Oct 2026. Reports received through 30 Jun 2026.

Drugs in these reports

The table has the 83 drug pages with 50 or more reports that record this term. The rows are in order of name. A drug page with fewer reports for this term is not in the table. The counts are the counts that the site keeps for each reaction term, and a count can be lower than the count of FDA.

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 2 Oct 2026.

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 11 Mar 2026. The site read the page on 2 Oct 2026.

Drugs that the reports with the term Delusion name as a suspect product, in order of name
Drug	Class	Reports with this term
Abilify	Atypical antipsychotic	672
Abilify Maintena		211
Acetaminophen		57
Alprazolam	Benzodiazepine	85
Amisulpride	Dopamine-2 receptor antagonist	103
Amitriptyline		61
Aripiprazole	Atypical antipsychotic	530
Aristada	Atypical antipsychotic	70
Atorvastatin		50
Avonex	Interferon beta	50
Baclofen	gamma-Aminobutyric acid-ergic agonist	59
Buprenorphine	Partial opioid agonist	54
Bupropion	Aminoketone	54
Bupropion hydrochloride	Aminoketone	56
Carbamazepine	Mood stabilizer	78
Carbidopa levodopa	Aromatic amino acid	201
Chantix	Partial cholinergic nicotinic agonist	179
Citalopram	Serotonin reuptake inhibitor	117
Clarithromycin	Macrolide antimicrobial	57
Clonazepam	Benzodiazepine	165
Clozapine	Atypical antipsychotic	522
Clozaril	Atypical antipsychotic	408
Cocaine		57
Cymbalta		124
Dexamethasone	Corticosteroid	56
Diazepam	Benzodiazepine	192
Donepezil		94
Duodopa		97
Escitalopram	Serotonin reuptake inhibitor	88
Exelon	Cholinesterase inhibitor	59
Fentanyl	Opioid agonist	56
Fluoxetine	Serotonin reuptake inhibitor	62
Foscarbidopa/foslevodopa		70
Gabapentin	Anti-epileptic agent	144
Geodon	Atypical antipsychotic	74
Haldol		102
Haloperidol	Typical antipsychotic	248
Humira		53
Invega	Atypical antipsychotic	125
Invega Sustenna	Atypical antipsychotic	273
Invega Trinza	Atypical antipsychotic	63
Lamictal	Anti-epileptic agent	57
Lamotrigine	Anti-epileptic agent	189
Latuda	Atypical antipsychotic	103
Levetiracetam		184
Lithium	Mood stabilizer	89
Lithium carbonate	Mood stabilizer	77
Lorazepam	Benzodiazepine	153
Lyrica		106
Mirtazapine		145
Morphine sulfate	Opioid agonist	79
Nuplazid	Atypical antipsychotic	2,752
Olanzapine	Atypical antipsychotic	633
Oxycodone hydrochloride	Opioid agonist	89
OxyContin	Opioid agonist	130
Paliperidone	Atypical antipsychotic	105
Paxil	Serotonin reuptake inhibitor	94
Prednisone	Corticosteroid	66
Pregabalin		136
Quetiapine	Atypical antipsychotic	396
Quetiapine fumarate	Atypical antipsychotic	108
Rexulti	Atypical antipsychotic	62
Risperdal	Atypical antipsychotic	276
Risperdal Consta		129
Risperidone	Atypical antipsychotic	450
Rytary	Aromatic amino acid	63
Seroquel	Atypical antipsychotic	297
Sertraline	Serotonin reuptake inhibitor	189
Sinemet	Aromatic amino acid	68
Tamiflu	Neuraminidase inhibitor	76
Topiramate		82
Tramadol		104
Valproate sodium	Anti-epileptic agent	70
Valproic acid	Anti-epileptic agent	89
Venlafaxine	Serotonin and norepinephrine reuptake inhibitor	105
Venlafaxine hydrochloride	Serotonin and norepinephrine reuptake inhibitor	75
Xanax	Benzodiazepine	57
Xyrem	Central nervous system depressant	117
Zoloft	Serotonin reuptake inhibitor	83
Zolpidem	gamma-Aminobutyric acid A receptor positive modulator	73
Zopiclone		56
Zuclopenthixol		72
Zyprexa	Atypical antipsychotic	217

The page of each drug has the count of each reaction term in its reaction lookup.

Drug classes in these reports

The table has the 59 pharmacologic classes with 25 or more reports that record this term. The rows are in order of name.

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 2 Oct 2026.

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 11 Mar 2026. The site read the page on 2 Oct 2026.

Pharmacologic classes of the drugs that the reports with the term Delusion name, in order of name
Class	Reports with this term
Aminoketone	146
Angiotensin 2 receptor blocker	61
Anti-epileptic agent	725
Anticholinergic	32
Antimalarial	33
Antimetabolite immunosuppressant	35
Aromatase inhibitor	31
Aromatic amino acid	429
Atypical antipsychotic	8,360
Benzodiazepine	807
beta-Adrenergic blocker	106
Biguanide	30
Calcineurin inhibitor immunosuppressant	53
Calcium channel blocker	32
Catechol-O-Methyltransferase inhibitor	60
CD20-directed cytolytic antibody	51
Central nervous system depressant	144
Central nervous system stimulant	237
Cholinesterase inhibitor	160
Corticosteroid	223
Dopamine-2 receptor antagonist	104
Factor Xa inhibitor	43
Fluoroquinolone antibacterial	76
Folate analog metabolic inhibitor	61
gamma-Aminobutyric acid A receptor positive modulator	126
gamma-Aminobutyric acid-ergic agonist	73
Herpes simplex virus nucleoside analog DNA polymerase inhibitor	58
Histamine-1 receptor antagonist	73
HMG-CoA reductase inhibitor	36
Influenza A M2 protein inhibitor	64
Integrin receptor antagonist	43
Interferon alpha	32
Interferon beta	67
Kinase inhibitor	89
Leukotriene receptor antagonist	25
Loop diuretic	27
Macrolide antimicrobial	66
Monoamine oxidase inhibitor	27
Mood stabilizer	259
Muscle relaxant	25
N-methyl-D-aspartate receptor antagonist	25
Neuraminidase inhibitor	90
Nitroimidazole antimicrobial	34
Nonergot dopamine agonist	187
Nonsteroidal anti-inflammatory drug	112
Norepinephrine reuptake inhibitor	38
Opioid agonist	742
Opioid antagonist	56
Partial cholinergic nicotinic agonist	189
Partial opioid agonist	73
Phenothiazine	56
Proton pump inhibitor	112
Serotonin and norepinephrine reuptake inhibitor	257
Serotonin reuptake inhibitor	886
Sympathomimetic-like agent	50
Thalidomide analog	29
Tumor necrosis factor blocker	38
Typical antipsychotic	261
Vesicular monoamine transporter 2 inhibitor	26

A class with many reports in all has many reports for almost every term.

Reports by month

Reports that record Delusion, by month, five years to June 2026

FDA releases FAERS data every quarter, so the newest months are not complete. They grow in later releases.

Patients in these reports

Age of the patient in the reports that record Delusion
Age	Reports	Share
Under 2	7	under 0.1%
2 to 11	146	1%
12 to 17	269	1.8%
18 to 44	3,081	20.2%
45 to 64	2,670	17.5%
65 to 74	1,652	10.8%
75 and over	2,141	14.1%
Age not given	5,271	34.6%

Sex of the patient in the reports that record Delusion
Sex	Reports	Share
Female	6,675	43.8%
Male	7,532	49.4%
Unknown or not given	1,030	6.8%

Age and sex are as the report gives them. 55.4% of these reports give the United States as the country.

Terms near this one

These are the next terms in the A to Z list. The links are for navigation.

Official pages

MedWatch Online Voluntary Reporting FormThe online form of FDA for a voluntary report.
MedWatch: The FDA Safety Information and Adverse Event Reporting ProgramThe page of the FDA program that receives reports about drugs and devices.
FDA Adverse Event Monitoring System (AEMS) Public DashboardThe public dashboard of FDA for adverse event reports on drugs and biologics.

The site checked these addresses on 2 Oct 2026. The links open in a new tab.

Cite this page

Reported Reactions. Delusion: adverse event reports that record this term. https://reportedreactions.com/reaction/delusion/ Source: U.S. Food and Drug Administration, openFDA Drug Adverse Event (FAERS) files, release of 29 Oct 2026. Reports received through 30 Jun 2026.

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 count has the reports with each spelling of one MedDRA preferred term. 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

What does Delusion mean in an adverse event report?

In plain words: a fixed false belief. It is a MedDRA preferred term. FDA codes the description of a reporter with the MedDRA dictionary. The openFDA files do not have the description itself, and this site does not show it.

Does a drug in the table mean that the drug was responsible for this reaction?

No. FDA says:

No individual drug is connected to any individual reaction.
Source: openFDA, Drug Adverse Event Overview. The site read the page on 2 Oct 2026.

When a report lists multiple drugs and multiple reactions, there is no way to conclude from the data therein that a given drug is responsible for a given reaction.
Source: openFDA, Drug Adverse Event Overview. The site read the page on 2 Oct 2026.

What does this page tell a person who has this symptom?

This page gives counts of reports. It cannot assess a person. A pharmacist or a clinician can assess a person.

If this is a medical emergency, please call 911.
Source: FDA, MedWatch Online Voluntary Reporting Form. The site read the page on 2 Oct 2026.

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