I had started with 50mg and decided to cut the dosage down to 25mg for a substantial savings. For me, 25mg works just as well as 50mg.
As mentioned, Canada drug stores offer fantastic savings, with 25mg pills for less than 40 cents.
Here is the list of Canada Dealers I have used with no problems. I can't recommend any one of them, so shop around for the best prices.
I order about 300 pills at a time to get the best price, then keep them sealed in plastic bags & located in the fridge. I suggest starting with 25MG v1agra. v1agra (Sildenafil) is extremely powerful and 100mg is overdose for many.
Also, erectile dysfunction is usually an early warning sign of potentially serious health problems, heart disease or diabetes. See tips in this link to treat such problems: https://docs.google.com/document/d/1vpBf2OUlekJ1gjPy4G_SUSL5BLXc9rp0mO-4KTVuATA/edit#
By following these tips, you may not even need v1agra and easily reverse your health problems.