system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following agent is not used in erectile dysfunction:
assistant
The correct answer is  Alpha blockers are used in erectile dysfunction not alpha agonists (phenyephrine).
Drugs useful in the management of erectile dysfuncLion (ED)
1. Phosphodiesterase inhibitors

Sildenafil
Vardenafi
Tadalafil
Udenafil

2. PGE1 analog - Alprostadil
3. Aviptadil