Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Read about the MOST prescribed medicine in the USA.

This enlightening book finally explodes the myth about estrogen's safety. There is a good explanation on the origins of estrogen as well as coverage about how DANGEROUS it is.There is a lot of detail in the book and it is also has a handy explanation of commonly prescribed TYPES of estrogens for anyone who is considering their use.