Erectile dysfunction (ED) is a common clinical condition which mainly affects men aged over 40 years. It is characterized by the inability to achieve or maintain an erection adequate for satisfactory sexual intercourse. ED can be caused by neurological, vascular, hormonal, and psychological factors. Common disorders that lead to ED include hypertension, diabetes mellitus, obesity, testosterone deficiency, hyperlipidemia, and prostate cancer treatment. Relationship issues and performance anxiety are the common psychological causes of ED. Usage of certain medicines (such as antidepressants) and substances (such as tobacco) can cause or aggravate ED. Furthermore, ED is linked with increased risk of developing cardiovascular disease, especially in men diagnosed with metabolic syndrome. 

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