After starting GDMT dose changes, when should renal function and electrolytes be checked?

• A. Within 1–2 weeks after initiation or dose changes
• B. Only after 3–6 months
• C. Only yearly
• D. Only if symptoms worsen.

Answer: (A)

Starting GDMT and adjusting doses can change kidney function and electrolyte balance quickly because these therapies influence renal perfusion and how the body handles potassium. Rechecking renal function and electrolytes within 1–2 weeks after initiation or dose changes allows early detection of rising creatinine or potassium abnormalities, so you can adjust or hold therapy promptly if needed. Waiting longer (3–6 months or yearly) risks missing these early changes, and checking only if symptoms worsen misses potentially dangerous, asymptomatic derangements. Baseline labs plus the early 1–2 week check is the safest approach to ensure tolerability and safety while the patient remains on GDMT.