What is the usual adult dose of spironolactone?

Spironolactone Usual Adult Dose

For heart failure, initiate spironolactone at 12.5-25 mg once daily, with a target maintenance dose of 25-50 mg daily; for hypertension, start at 25-100 mg daily; and for edema in cirrhosis, begin at 100 mg daily (range 25-200 mg). 1, 2

Heart Failure Dosing

The most recent 2022 ACC/AHA/HFSA guidelines recommend starting at 25 mg once daily in patients with serum potassium ≤5.0 mEq/L and eGFR >50 mL/min/1.73 m², with uptitration to 50 mg daily as tolerated. 1, 2

• For patients with eGFR 30-50 mL/min/1.73 m², initiate at 12.5-25 mg daily or every other day due to hyperkalemia risk 1, 2
• The landmark RALES trial used 12.5-50 mg daily, with a mean dose of 26 mg at study end, demonstrating a 30% mortality reduction 1, 2
• Patients intolerant of 25 mg daily can be reduced to 25 mg every other day 2
• Spironolactone is contraindicated when eGFR <30 mL/min/1.73 m² 1, 2

Hypertension Dosing

Start at 25-100 mg daily in single or divided doses, with titration at two-week intervals. 1, 2

• Doses greater than 100 mg/day generally do not provide additional blood pressure reductions 2
• The 2018 ACC/AHA hypertension guidelines list 25-100 mg once daily as the usual dose range 1
• Evidence suggests minimal dose-response effect above 50 mg/day for blood pressure lowering 3

Edema in Cirrhosis Dosing

Initiate at 100 mg daily (range 25-200 mg) in single or divided doses, with hospitalized titration recommended. 2

• When used as sole diuretic, administer for at least 5 days before increasing dose 2
• Maximum dose is 400 mg daily, often requiring combination with loop diuretics 4
• Higher doses may be needed due to secondary hyperaldosteronism in cirrhosis 4

Primary Hyperaldosteronism Dosing

Administer 100-400 mg daily for surgical preparation or long-term maintenance in non-surgical candidates. 2

Critical Monitoring Requirements

Check potassium and creatinine at 3 days, 1 week, then monthly for the first 3 months, and every 3-6 months thereafter. 1, 4

• The 2022 ACC/AHA guidelines mandate checking at 1 week and 4 weeks after initiation or dose changes 1
• More frequent monitoring is required when combining with ACE inhibitors or ARBs 1, 4
• If potassium rises >5.5 mEq/L, reduce dose by half; if >6.0 mEq/L, discontinue immediately 1, 4

Key Safety Considerations

Avoid initiating if baseline creatinine >2.5 mg/dL (men) or >2.0 mg/dL (women), or if baseline potassium >5.0 mEq/L. 1

• Real-world hyperkalemia rates (15-24%) far exceed clinical trial rates (2%), requiring vigilant monitoring 1, 4
• Discontinue potassium supplementation when starting spironolactone 1, 4
• Never routinely combine ACE inhibitor + ARB + aldosterone antagonist due to dramatically increased hyperkalemia risk 1, 4
• Gynecomastia occurs in approximately 10% of men; eplerenone may be substituted 1, 4

Common Pitfalls to Avoid

• Do not use doses >100 mg/day for hypertension, as they provide no additional benefit and increase adverse effects 2, 3
• Instruct patients to stop spironolactone during diarrhea or dehydration to prevent acute kidney injury 1, 4
• Avoid NSAIDs and COX-2 inhibitors, which worsen renal function and increase hyperkalemia risk 1, 4
• Do not reduce dose when creatinine is decreasing—this indicates improving renal function; only reduce for rising creatinine 5