This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Pharmacology
Which of the following drugs is NOT used for erectile dysfunction? 
Select and explain. 
A. Phenylephrine, B. Apomorphine, C. Yohimbine, D. Vardenafil
A: Phenylephrine
Answer: A: Phenylephrine 
Explanation: Phenylephrine - It is a selective a1 agonist- It raises BP by causing vasoconstriction. Because it has little cardiac action, reflex bradycardia is prominent. it is Used as a nasal decongestant and for producing Mydriasis when cycloplegia is not required. Phenylephrine tends to reduce intraocular tension by constricting ciliary body blood vessels. ESSENTIALS of medical PHARMACOLOGY SEVENTH EDITION-kD TRIPATHI Page:127