MedDRA preferred term · swelling where the injection was given

Injection site swelling: adverse event reports recording this term

74,732 reports to FDA record it, 2004–2026; 0.4% of the database.

Read first · FDA's statement on these data

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. openFDA, FDA

FDA adds: "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 "cannot be used to estimate the incidence of these events."

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.

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

74,732
reports recording the term: 0.4% of all reports; 5,922
reports, 12 months to June 2026: 5,502 in the 12 months before; 15.4%
marked serious by the reporter: 57.4% across all reports; 0.3%
record death among outcomes, as reported: 9.1% across all reports

"Injection site swelling" (in plain words, swelling where the injection was given) is a MedDRA preferred term recorded in 74,732 adverse event reports received by FDA, 0.4% of the database, from February 2004 to June 2026. The term is chosen by whoever codes the report to match what the reporter described.

5,922 reports recorded it in the 12 months to June 2026, close to the 5,502 of the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Of reports recording this term, 15.4% are marked serious, 0.3% include death among the outcomes and 4.8% include hospitalisation, as reported.

The drugs listed most often as suspect products in those reports are Enbrel, Dupixent and Humira. That order mostly follows how many reports each drug has overall; the table also gives the term's share within each drug's own reports. 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

FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.

Drugs listed as suspect products in these reports

Drug	Class	Reports with this term	Share of the drug's own reports
Enbrel	Tumor necrosis factor blocker	23,168	4.1%
Dupixent	Interleukin-4 receptor alpha antagonist	11,517	2.5%
Humira	—	7,476	1.2%
Repatha	PCSK9 inhibitor	2,009	1.3%
Taltz	Interleukin-17A antagonist	1,622	4.8%
Copaxone	—	1,123	2.7%
Mounjaro	GLP-1 receptor agonist	947	1.1%
Makena	—	919	4.1%
Emgality	—	792	2.7%
Trulicity	GLP-1 receptor agonist	764	1%
BOTOX Cosmetic	Acetylcholine release inhibitor	725	1.9%
Vivitrol	—	672	2.7%
Zepbound	GLP-1 receptor agonist	633	1%
Cimzia	Tumor necrosis factor blocker	613	0.7%
Kevzara	Interleukin-6 receptor antagonist	603	2.6%
Bydureon	—	598	3.1%
Hizentra	Human immunoglobulin G	557	2.4%
Palynziq	—	554	6.8%
Forteo	Parathyroid hormone analog	530	0.5%
Aimovig	—	509	1%
Humira 40 Mg/0 8 Ml Pen	—	491	3.2%
Cosentyx	Interleukin-17A antagonist	438	0.3%
Ajovy	—	434	4.3%
Praluent	PCSK9 inhibitor	433	1.9%
Strensiq	—	427	4.5%

Drugs with a page on this site, ordered by the number of their reports recording this term. The last column is the term's share within that drug's own reports, against 0.4% across the whole database. 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."

By pharmacologic class

Class	Reports with this term	Share of class reports	Median drug in class
Tumor necrosis factor blocker	24,428	2.3%	0.2%
Interleukin-4 receptor alpha antagonist	11,898	2.5%	2.8%
GLP-1 receptor agonist	2,862	0.7%	0.3%
PCSK9 inhibitor	2,476	1.4%	1.6%
Interleukin-17A antagonist	2,127	1.1%	1.6%
Acetylcholine release inhibitor	1,474	1.7%	2.2%
Interferon beta	920	0.5%	0.6%
Interleukin-6 receptor antagonist	865	0.6%	0.3%
Human immunoglobulin G	804	1.1%	0.1%
Insulin analog	618	0.2%	0.1%

Classes ordered by count. Class shares follow the class's overall report volume as much as anything else.

Patients in these reports

Patient age

Under 20.1%107

2 to 111.8%1,358

12 to 172.2%1,677

18 to 4422.8%17,036

45 to 6428.2%21,090

65 to 747.9%5,879

75 and over3.1%2,347

Age not given33.8%25,238

Patient sex

Female70.1%52,407

Male22.1%16,501

Not given7.8%5,824

Grey bar: all 20,646,523 reports in the database. 92.3% of these reports give the United States as the country.

Questions about "Injection site swelling"

What does "Injection site swelling" mean in an adverse event report?

In plain language: swelling where the injection was given. It is a MedDRA preferred term, the dictionary FDA uses to code what a reporter described. The report's own description is not published by openFDA and is not shown here.

How many reports record injection site swelling?

74,732 reports through June 2026 (0.4% of all reports), 5,922 of them in the latest 12 months.

Which drugs appear most often in these reports?

Enbrel (23,168), Dupixent (11,517), Humira (7,476), Repatha (2,009) and Taltz (1,622). Drugs with many reports overall lead almost every term's list. 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."

Does a drug appearing here mean it was responsible for this reaction?

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."

I have this symptom. What should I do?

This site cannot assess anyone. A pharmacist or clinician can; for an emergency, call the local emergency number. Nothing on this page is medical advice.

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. Terms are pooled across spelling and capitalisation variants of one MedDRA preferred term. 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.