Diabetes is the most common cause of ED, affecting up to 50% of men with the condition.

Regular exercise is actually associated with a decreased risk of ED.

Oral medications, such as sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra), are the first-line treatment for ED.

Tadalafil (Cialis) has a duration of action of up to 36 hours, compared to 4-6 hours for sildenafil (Viagra), 4-8 hours for vardenafil (Levitra), and 6-12 hours for avanafil (Stendra).

Headache is the most common side effect of oral medications for ED, occurring in up to 10% of men.

Recreational drug use is not a contraindication to the use of oral medications for ED.

Penile injections of vasoactive medications, such as alprostadil and papaverine, are the second-line treatment for ED.

Priapism, infection, and scarring are all potential complications of penile injections for ED.

Vacuum erection devices are the third-line treatment for ED.

A vacuum erection device works by creating a vacuum around the penis, which draws blood into the corpora cavernosa, the erectile tissue of the penis.

Vacuum erection devices do not cause erectile dysfunction.

Hormone therapy is the fourth-line treatment for ED.

Testosterone is the most commonly used hormone in hormone therapy for ED.

Hormone therapy for ED does not typically cause weight loss.

Surgery is the fifth-line treatment for ED.

Penile implant, penile artery bypass surgery, and nerve grafting are all surgical procedures used to treat ED.