I will not use another Prescription book, as the is the absolute best one on the market. Every time I know a revised book is coming out ( but not necessary for all people to keep rebuying new ones- I just to), I always keep the updated version in my home, and I will NOT take a Med. prescribed before I read up on it. THIS book helped my husband tremendously and also his Dr. , as my husband had to be rushed to a hospital and it was THIS BOOK that told our Dr. that he had every common, less common & less frequesnt side affect-thus he was able to be treated. This was 4 yrs. ago about my husband. I even bought the book for that DR.,as he liked it alot too and wanted one! Even tells you how long it will take before med. starts working!