Google yesterday announced it is partnering up with CVS Pharmacy, one of the largest pharmacy chains in the US, to provide patients with online access to their prescription drug history through Google Health accounts.

Google Health allows users to import their medical records from over a dozen pharmacies, medical centers, and health insurance providers, which means they can review their records and stay updated on their health status.

As part of the new service, more than 100 million patients will be able to access their prescription drug purchase history from CVS. Google previously had similar agreements with Walgreens, Meijer, Medco, and a few other national pharmacies.

But will people feel comfortable with Google's access to their private prescription drug information? Medical data is very sensitive and personal, and people with a history of mental conditions and embarrassing deficiencies may now have to worry about Google using that information in statistical analysis, writes Mashable.

When Google Health launched last year Google said it would neither sell data nor serve advertising against it. Patients could import and manage their own health records and retain full power over which third parties may view it.