Welcome to PC!

As you and Skeezyks have mentioned, the answer is not so simple, but you could start to learn some pieces by using the PubMed database.
PubMed - NCBI

This will only give you access to research abstracts, not usually the full articles which are important to read. You might be able to access the full articles for free with the help of your local library or university, as these institutions often have paid subscriptions to such things. Also, PubMed is just one of many databases. Others include MedLine, PsychInfo, etc.

Another thing to keep in mind is the search terms you use. A lot of the time you might have to read articles just to learn the terminology of the field. For example, if I wanted to find out about liver damage from Thorazine, I'd use the terms hepatic and chlorpromazine.

My last tips would be to keep in mind that correlations (usually denoted with the letter r) don't have the power to attribute causality, and that changes in methodology can make it difficult to compare studies.