But I am highly concerned I have been taking prazosin (I'm at 6mgs, started at 2) since oct. of last year (2012) and I have ALWAYS been on the mylan brand, but the pharmacy I go to has to use teva brand because they 'couldn't get mylan' I am freaked out bc I know that some brands have different effectiveness rates or whatever and I take it for real bad nightmares, so I am scared it won't be as strong as mylan or my body will have to 'adjust' IDK but I am scared... I may be making a mountain outta a mole hill but I can't help it I am really concerned.. TIA!!!