Thanks for your query,based on the facts that you have posted it appears that you are facing problem of Erectile Dysfunction
and have been advised to take Dapoxetine
Dapoxetine is generally prescribed for premature Ejaculation
Please consult qualified Urologist
for evaluation and tests to detect the cause for your erectile dysfunction.
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..
In the mean while you can take Sildenafil (Viagra )as on demand .This will help to get good hard erection,.