I attended my monthly elder care support group yesterday and the topic of adverse drug interactions was brought up. Another participant pointed out that there was an observational study written in the Wall Street Journal that suggests that Lipitor may contribute to memory loss. There is no concrete evidence to support this. Although participants in this study who switched from Lipitor to other statins were relieved of their cognitive symptoms.
Here is the link to the article... http://online.wsj.com/public/article_print/SB120277403869360595.html
Here is another link that I found very useful. It tells you how the drugs you or your loved one may be taking interact with one another.