PubMed is a database of professional biomedical literature. It is a web-based, searchable database of over 22 million article references published in more than 5000 biomedical journals and magazines.

Cochrane provides systematic reviews (CDSR), DARE, controlled trials register, technology assessments, and economic evaluations.

Embase is a biomedical international database with strong focus on drugs and pharmacology, medical devices, clinical medicine, and basic science relevant to clinical medicine.

National Library Medicine database of authoritative health information.

Official US government site for Medicare. Find and compare health & drug plans, doctors, hospitals, nursing homes, etc.

Cochrane provides systematic reviews (CDSR), DARE, controlled trials register, technology assessments, and economic evaluations.

A public resource for evidence-based clinical practice guidelines.