No Improvements After 18 Months on Propecia — Should I Continue Taking It?

I noticed hair loss from the age of 17 and am now 23. About 2 years back I started using Minoxidil 2% for 6 months and started Minoxidil 5% for another 6 months. There wasnt any improvement and started using propecia for the last 1 year and 6 months. Over all these years there hasnt been any sort of improvement. I can only see my hair getting thinner and thinner with time. I thought propecia is supposed to arrest hair loss. Do I still continue on propecia?

First, as I have said again and again, you need a good diagnosis with your hair mapped out for miniaturization. If you have genetic hair loss and stop the finasteride, you will almost certainly see the hair loss become worse. Just because you are not seeing benefits, it does not mean that you are not getting benefits. Put some science and medical diagnostic force in what is happening to you.