Primary Care ERectile Function Outcome Registry for Men

Inclusion Criteria: 1. Adult male above 18 years of age 2. Married 3. Diabetic 4. Patient reports erectile dysfunction (symptomatic). 5. Patient is eligible to be prescribed sildenafil by treating clinician. Exclusion Criteria: 1. If at any other PDE-5 inhibitor (sildenafil, tadalafil, vardenafil, avanafil) 2. Concurrent use of organic nitrates (any form: glyceryl trinitrate, isosorbide mononitrate/dinitrate) - absolute contraindication 3. Recent or unstable cardiovascular disease * Myocardial infarction or stroke in last 3 months * Unstable angina * Uncontrolled arrhythmia or heart failure NYHA III-IV * Resting hypotension (SBP \< 90 mmHg) or uncontrolled hypertension (SBP \> 180 mmHg) per treating clinician * Known severe hepatic impairment or severe renal impairment on dialysis (if local clinician deems unsafe) * Known hypersensitivity to sildenafil or excipients * Concomitant use of potent CYP3A4 inhibitors (e.g., ritonavir) - unless clinician documents safe plan/dose adjustment