I received my order from UK Medix the other day of 4 10mg tablets. Not used any yet but will be doing so tomorrow night. Ive read on here how most men are using 20mg. I've had so many problems with ED that I want to be certain things are going to work. Should I take 2 tablets of 10mg just to make sure? Or would 10mg be ok. I dont want to take any chances of it not working. Any suggestions??