**2.3 Erectile dysfunction**

Most prevalent reason for erectile dysfunction includes neurovascular problems, or psychological factors [11]. The main symptom involves the inability to keep an erection firm enough for intercourse. Though, most men experience difficulty in keeping the erection but erectile dysfunction is only considered a concern if it impairs the satisfactory sexual performance [11]. Erectile dysfunction is usually caused by anxiety, fatigue, or consumption of alcohol [12]. Drugs like sildenafil are used to raise the blood flow to the penis to aid the cause of the erection [13]. Possible causes include the tapering of penis blood vessels, increased blood pressure, raised cholesterol, hormonal issues or even the side effects of the other prescribed medicines.
