In CrCl less than 30 mL/min, which action is recommended for colchicine?

• A. Reduce dose
• B. Monitor for adverse effects
• C. Avoid
• D. Stop therapy

Answer: (A)

Colchicine has a narrow therapeutic window and is cleared mainly by the kidneys. When creatinine clearance is very low (less than 30 mL/min), the drug can accumulate, increasing the risk of serious toxicity such as gastrointestinal symptoms, neuromuscular issues, and bone marrow suppression. The best approach is to reduce the dose (or extend the dosing interval) to lower overall exposure while still allowing some therapeutic effect. This helps prevent toxicity without abruptly stopping therapy. Merely monitoring for adverse effects after a full dose won’t prevent dangerous accumulation, and stopping therapy altogether is usually reserved for toxicity or severe worsening of renal function. Drug interactions that inhibit clearance can further raise risk, so dose adjustment is especially important in this context.