Sildenafil acts over a comparatively short window and its absorption can be slowed by a high-fat meal, so timing matters more. Tadalafil has a considerably longer half-life, which is why men often describe it as less scheduled, and it also carries labeled uses beyond erectile dysfunction, including benign prostatic hyperplasia symptoms.
Side-effect patterns differ slightly in character — headache, flushing, nasal congestion and dyspepsia are described for both, with back and muscle pain more characteristic of tadalafil and visual changes more often mentioned with sildenafil.
Both share the same absolute safety issue: they must not be combined with nitrates, and caution applies with certain alpha-blockers and in men with significant cardiovascular disease. Which one suits you depends on your other conditions, your medications and how you would actually use it.
Risks and limitations
- Neither may be used with nitrates in any form.
- Both require review of cardiovascular status and current medications.
- Rare but serious effects including sudden vision or hearing loss and prolonged erection are described in labeling.
- Effectiveness varies, and neither treats an underlying cause.