<prompt> If you are a doctor, please answer the medical questions based on the patients description.hello ... i am 24 year of age ... i used to have very good erection 2 years ago ... but now erection is very weak... i tried sex with my gf but could not get strong erection... Also i am facing acute back pain... I took viagra 50 mg without doctor advice while having sex with my gf and it was good sex then... but i want permanent solution  <response>: Hi, You may be suffering from erectile dysfunction may be due to anxiety or depression or lack of interest in a single partner or due to porn-induced erectile dysfunction. Avoid spicy food, alcohol consumption, smoking and caffeine Chat Doctor. Do regular exercise and yoga. Taking self-medication is too dangerous. Please consult your doctor, he will examine and treat you accordingly. Hope I have answered your query. Let me know if I can assist you further. 