I have been taking this drug for over 5 years at 10 mg and many times they are useless. It wasn't until today that I saw all of the other complaints online. I have tried to have the brand changed by Walgreens but they tell me it is not possible. Now my only choice is to try and find another Pharmacy to get another brand. Everyone posting on this site that is having the same problem needs to also write snail mail letters. It is the only thing companies pay attention to these days. Mine will be going out tomorrrow to both Walgreens Corporate headquarters, the CDC and KVK Tech.