Its a very helpful piece of collective info. Honestly, I think this book is both very good and very bad for the following reasons.
1- Very good in the sense that people without access to medical facilities but with medically treatable conditions, have an enormous source of information.
2- Very bad in the sense that if misinterpreted, the prescription part can be a very dangerous section especially to the less literate.
In general though, the book is extremely good.