Which of the following strategies is commonly used to optimize MTX tolerance?

• A. Split dose schedule
• B. Increase dose frequency
• C. Stop MTX
• D. Switch to NSAIDs

Answer: (A)

Optimizing tolerability of methotrexate hinges on reducing peak drug exposure while preserving the overall weekly dose. Splitting the weekly MTX dose into smaller portions taken on different days lowers peak plasma concentrations, which can lessen mucosal and gastrointestinal side effects, reduce liver and bone marrow toxicity risk, and often improve overall tolerability. This approach maintains therapeutic exposure but smooths out the highs that contribute to adverse effects, making it a common practical strategy.

Increasing dose frequency would raise total exposure and toxicity risk, not improve tolerance. Stopping MTX defeats the goal of maintaining disease control. Switching to NSAIDs is not a tolerance strategy for MTX; it can interact with MTX and potentially worsen toxicity by affecting renal clearance, so it’s not used to optimize MTX tolerability.