Is Otrexup Approved for Arthritis?
No, Otrexup (methotrexate injection) is FDA-approved only for active rheumatoid arthritis (RA) in adults and polyarticular juvenile idiopathic arthritis (pJIA) in children [1]. It is not approved for osteoarthritis or other non-inflammatory arthritis types.
What Is Otrexup Used For?
Otrexup delivers methotrexate subcutaneously for:
- Moderate-to-severe active RA in adults after oral methotrexate failure or intolerance.
- Active pJIA in children 2 years and older.
- Active psoriasis in adults with inadequate response to topical or phototherapy [1][2].
It is not indicated for psoriatic arthritis, gout, or ankylosing spondylitis.
How Does Methotrexate Treat Arthritis?
Methotrexate suppresses immune activity to reduce joint inflammation and slow RA or pJIA progression. Weekly self-injected doses via Otrexup's auto-injector start low (7.5 mg) and increase based on response, up to 25 mg [1]. Oral methotrexate is first-line; Otrexup offers easier administration for those with nausea or absorption issues.
Is Otrexup Used Off-Label for Other Arthritis Types?
Off-label use for osteoarthritis occurs rarely, as methotrexate targets autoimmune inflammation, not OA's cartilage wear. No major guidelines recommend it for OA, and evidence is limited to small studies with mixed results [3]. Doctors avoid it due to risks without proven benefit.
Common Side Effects and Monitoring for Arthritis Patients
Patients report nausea, fatigue, mouth sores, and hair thinning. Serious risks include liver damage, lung issues, and low blood counts, requiring monthly blood tests and folate supplements [1][2]. Arthritis users on Otrexup often combine it with biologics like Humira for better control.
Alternatives for Arthritis Treatment
| Condition | Common Alternatives to Otrexup/Methotrexate |
|-----------|---------------------------------------------|
| Rheumatoid Arthritis | Enbrel, Humira, Xeljanz, NSAIDs like ibuprofen |
| Osteoarthritis | Acetaminophen, topical NSAIDs, physical therapy, joint injections |
| Psoriatic Arthritis | Cosentyx, Tremfya (biologics targeting IL-17) |
Switching depends on disease severity and response [4].
Who Makes Otrexup and Cost Details?
Antares Pharma manufactures Otrexup. A 25 mg dose costs $500–$1,000 monthly without insurance; copay cards reduce it to $5–$25 for eligible patients [5]. Patents expire around 2027–2031; no generics yet [6].
Sources
[1]: FDA Label for Otrexup
[2]: Otrexup.com Prescribing Information
[3]: Arthritis Foundation on Methotrexate
[4]: ACR RA Guidelines 2021
[5]: GoodRx Otrexup Pricing
[6]: DrugPatentWatch.com - Otrexup Patents