Common Side Effects of Otrexup
Otrexup, an autoinjector form of methotrexate used for rheumatoid arthritis, psoriasis, and polyarticular juvenile idiopathic arthritis, causes side effects similar to other methotrexate products. Patients most often report nausea, vomiting, stomach pain, mouth sores, hair loss, fatigue, dizziness, and headache. Injection site reactions like redness, swelling, or pain occur in about 10-20% of users.[1][2]
Serious Side Effects and Warnings
Severe risks include liver damage (monitor with blood tests), lung problems (shortness of breath or cough), bone marrow suppression (low blood cell counts leading to infections, anemia, or bleeding), and increased infection risk. Sudden severe stomach pain, bloody diarrhea, or vision changes require immediate medical attention. Avoid alcohol and certain drugs that stress the liver.[1][3]
Side Effects by Dosage and Use
Higher weekly doses (up to 25 mg) raise risks of gastrointestinal issues and fatigue. Long-term use heightens chances of liver fibrosis or lymphoma. In children, growth suppression is a concern. Pregnancy is contraindicated due to birth defects; use contraception.[2][4]
How Otrexup's Delivery Affects Side Effects
The subcutaneous autoinjector may cause more local skin reactions than oral methotrexate but fewer stomach issues than pills. Pain at injection site affects up to 71% of patients, usually mild and temporary.[1][3]
Managing and Reporting Side Effects
Take folic acid supplements to reduce nausea and mouth sores. Report persistent symptoms to a doctor; regular blood tests track liver and blood health. FDA post-marketing data notes rare severe skin reactions or neurological effects.[2][4]
Compared to Other Methotrexate Forms
Otrexup has similar systemic effects to Rasuve or oral methotrexate but higher local reactions due to injection. Biosimilars like those from competitors show comparable profiles.[1]
[1]: Otrexup Prescribing Information (FDA)
[2]: Drugs.com - Otrexup Side Effects
[3]: MedlinePlus - Methotrexate Injection
[4]: Otrexup.com - Patient Information