Before you start
- Never take it with nitrates (often prescribed for chest pain) or with riociguat. Tell us if you use either.
- Alpha blockers and some blood pressure medicines need care. Share every medicine, including supplements.
- Pick a time of day you can keep, such as with breakfast. Mention urinary symptoms and heart disease.
- Get urgent care for an erection lasting more than 4 hours, sudden vision or hearing loss, or chest pain.











