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This compares for example to sildenafil (Viagra) which lasts for around 4 hours. Erectile dysfunction can be caused by stress, psychosexual problems, and lifestyle choices such as smoking, heavy drinking, obesity, and lack of exercise. Other causes may include spinal injury or operations on the prostate or bowel. Regular cycling for 3 or more hours a day may also contribute to ED. Other oral PDE5 treatments include Viagra (sildenafil), Levitra (vardenafil), and Spedra (avanafil) which typically last 4 hours. A very rare but serious side effect is priapism - a continuous painful erection over a period of hours.
The tablet should be taken with water half an hour prior to sexual intercourse and should not be taken more than once within 24 hours. Tadalafil will only work with sexual stimulation