Common Side Effects of Enbrel
Enbrel (etanercept) most often causes injection site reactions like redness, itching, swelling, or pain, affecting up to 37% of users in clinical trials. Other frequent issues include upper respiratory infections (up to 29%), headache (up to 26%), rash (up to 13%), and sinusitis (up to 11%). These typically resolve without stopping treatment.[1][2]
Serious Side Effects and Risks
Serious infections occur in about 3% of patients, including tuberculosis, fungal infections like histoplasmosis, and bacterial sepsis—higher risk in those with chronic conditions or on immunosuppressants. Enbrel increases chances of lymphoma and other cancers (observed rate 0.06 per 100 patient-years vs. 0.02 in general population). It can trigger new or worsening heart failure, hepatitis B reactivation, or autoimmune reactions like lupus-like syndrome. Nervous system effects include multiple sclerosis-like demyelination. Stop use and seek immediate care for persistent fever, cough, or neurological changes.[1][2][3]
Side Effects in Specific Groups
Children and rheumatoid arthritis patients report similar profiles but higher rates of abdominal pain (up to 15%) and vomiting (up to 9%). Psoriasis users see more skin infections. No unique pregnancy risks identified, but data is limited—use only if benefits outweigh risks. Elderly patients face elevated infection risk.[1][2]
What Happens If You Miss a Dose or Overdose?
Missing a dose may reduce effectiveness without immediate side effects; resume as scheduled. Overdose (up to 6 times normal) causes no specific symptoms beyond typical reactions—monitor for infections.[2]
How Does Enbrel Compare to Humira Side Effects?
Both TNF inhibitors share infection and cancer risks, but Enbrel has fewer gastrointestinal issues (e.g., less nausea than Humira's 10-20%). Humira reports more serious infections (4-8%) in head-to-head trials.[3]
Managing and Reporting Side Effects
Monitor for infections before and during treatment with TB screening. Report severe effects to FDA via MedWatch or 1-800-FDA-1088. Most resolve after discontinuation.[1][2]
[1] Enbrel Prescribing Information, Amgen, https://www.pi.amgen.com/unitedstates/enbrel/-/media/Project/Amgen/Repository/pi-amgen-com/Amgen/Product/enbrel/us/enbrel-pi-hc-2019mar.ashx
[2] Drugs.com Enbrel Side Effects, https://www.drugs.com/sfx/enbrel-side-effects.html
[3] FDA Label Updates and Clinical Data, https://www.accessdata.fda.gov/drugsatfdadocs/label/2023/103795s5605lbl.pdf