Sympathomimetic drugs are used in all of the conditions, except:
High blood pressure
Acute uncompensated cardiac failure
Low blood pressure
Erectile dysfunction
Erection is mediated parasympathetic stimuli, while ejaculation is under control of sympathomimetic agents. Thus sympathomimetic agents will not help in erectile dysfunction. Ref: Richard Finkel, Michelle Alexia Clark, Pamela C. Champe, Luigi X. Cubeddu (2009), Pharmacology, 4th Edition, Lippincott Williams and Wilkins Publications, United States Page 65 ; Principles of Anatomy and Physiology By Taora 10th Edition, Page 580