The Unseen Danger of Methotrexate Toxicity

Area of Science:

• Immunology
• Pharmacology
• Oncology

Background:

• Methotrexate is a widely used immunosuppressant and chemotherapy drug.
• Close monitoring for adverse effects is standard practice.
• Methotrexate toxicity is considered infrequent.

Observation:

• A 51-year-old woman with rheumatoid arthritis presented with altered mental status, jaundice, and mucosal ulceration.
• She was admitted to the ICU with septic shock, pancytopenia, acute renal failure, and acute liver failure.
• These severe symptoms occurred in the context of methotrexate and prednisone treatment.

Findings:

• The patient's presentation was indicative of severe methotrexate toxicity.
• The toxicity manifested as multi-organ failure, including liver and kidney.
• Septic shock and pancytopenia were critical complications.

Implications:

• This case highlights the importance of recognizing the diverse and severe signs of methotrexate toxicity.
• Prompt identification and management are vital, even when toxicity is infrequent.
• Clinicians should maintain a high index of suspicion for methotrexate toxicity in patients presenting with compatible symptoms.