Hello Thanks for query .You are facing problem of Erectile Dysfunction since one yer and your family physician has prescribed Duzela . Duzela is generally prescribed for depression and has side effect of ED . You need to consult qualified Urologist to evaluate to find out cause for your Ed .You need to do following basc tests to rule out any organic cause for your Ed 1) Haemogram 2) Thyroid Hormone assessment 3) Color Doppler ultrasound Scan of penis to rule out any vascular insufficiency as a cause of your Ed. Marginally low level of Testosterone can not be a cause for your ED. If any organic cause for your Ed is ruled out it can be considered to be Psychogenic in origin. Following measure will help you to boost up your confidence and getting good erection and delay ejaculation. 1) Practice regular exercise for 45 minutes followed by meditation for 1/2 an hour in the morning. 2) Take high protein diet rich in vegetables and fruits and Vitamin A,C,D,E.and Zinc 3)Take anti oxidants like Almonds 5-6 everyday.. 4) Avoid alcohol and smoking Taking Sildenafil as on demand will help you to resolve issue of Erectile Dysfunction . Dr.Patil. .