Transitioning from Tadalafil to Sildenafil

Pharmacological Differences

• Tadalafil has a significantly longer half-life of 17.5 hours compared to sildenafil with a half-life of approximately 4 hours, according to the American College of Cardiology and European Urology 1, 2
• Due to tadalafil's longer duration of action, patients should wait at least 24-48 hours after their last tadalafil dose before initiating sildenafil therapy, as recommended by the American College of Cardiology 1

Safety Considerations

• PDE5 inhibitors should never be used concomitantly with nitrate medications due to risk of severe hypotension, as stated by the American College of Cardiology 1
• Patients on sildenafil should avoid taking nitroglycerin for at least 24 hours after sildenafil use, according to the American College of Cardiology 1

Cardiovascular Considerations

• For patients with cardiovascular disease, assess risk before transitioning between PDE5 inhibitors, as recommended by the Mayo Clinic 5
• Low-risk patients can generally resume sexual activity and use PDE5 inhibitors safely, according to the Mayo Clinic 5

Follow-up Recommendations

• Schedule follow-up within 4-12 weeks after initiating sildenafil to assess efficacy and tolerability, as recommended by the American College of Cardiology 1