Misoprostol and Methotrexate Interaction
Drug interaction information between Misoprostol and Methotrexate.
Misoprostol and Methotrexate have a documented moderate interaction in FDA labeling.
FDA drug labeling documents a moderate-severity interaction between Misoprostol and Methotrexate. This page displays the available source-record category and label text. The category is not an individual risk estimate or medication-combination direction.
How They Interact
The diclofenac in this medicine can stop your body from getting rid of methotrexate properly. This can cause methotrexate to build up to harmful levels in your blood.
FDA Label Information
Methotrexate Clinical Impact: Concomitant use of NSAIDs and methotrexate may increase the risk for methotrexate toxicity (e.g., neutropenia, thrombocytopenia, renal dysfunction). Intervention: During concomitant use of diclofenac sodium/misoprostol and methotrexate, monitor patients for methotrexate toxicity.
Misoprostol Also Interacts With
- Diclofenac moderate
- Diflunisal moderate
- Furosemide minor
- Aspirin minor
- Propranolol minor
Methotrexate Also Interacts With
- Celecoxib moderate
- Diflunisal moderate
- Indomethacin moderate
- Mefenamic Acid moderate
- Meloxicam moderate
Frequently Asked Questions
What SPL severity band is on file for Misoprostol + Methotrexate?
Compiled FDA labeling labels this pair moderate. That is a source-record field, not an individual medication-combination decision.
Which drug in this pair has the larger labeled-interaction portfolio?
Methotrexate has 38 labeled pairs on file vs Misoprostol's 12. In the moderate band specifically: Misoprostol has 3 (also Diclofenac, Diflunisal); Methotrexate has 12 (also Celecoxib, Diflunisal, Indomethacin, Mefenamic Acid).
What mechanism field is on file for Misoprostol and Methotrexate?
The diclofenac in this medicine can stop your body from getting rid of methotrexate properly. This can cause methotrexate to build up to harmful levels in your blood.
Methotrexate's labeled portfolio outnumbers Misoprostol
SPL source-record counts only. This page's band is moderate · classes on file: Misoprostol (Prostaglandin E1 Analog); Methotrexate (Disease-Modifying Antirheumatic Drug (DMARD)).
0 major · 3 moderate · 9 minor · 12 total
- Other moderate peers for Misoprostol
- Diclofenac
- Diflunisal
0 major · 12 moderate · 26 minor · 38 total
- Other moderate peers for Methotrexate
- Celecoxib
- Diflunisal
- Indomethacin
- Mefenamic Acid
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. This registry does not provide individual medication-combination directions.
Read our methodology - how this data is sourced, computed, and verified.