• AskDrWalker Resources and links to medical information. Includes medical databases, medical search engines, diseases and conditions and useful links for health professionals and patients.

• Best Evidence Topics Access to evidence-based medicine topics. Includes a searchable database.

• British National Formulary (BNF) The twice-yearly source of up-to-date guidance on prescribing, dispensing and administering medicines.

• Building Better Health Medical and healthcare information on disease and health improvement topics. Includes medical news, clinical research and newsletters.

• Centre for Medical Web Research A virtual centre for researching medical questions on the internet.

• DiagnosisHealth.com An online forum discussing various medical topics.

• DiagnosisHeart.com Information on heart disease with surgical data and related resources.

• DocMD.com Provides links to free medical and medically-related sites.

• DoctorNDTV.com Information on a variety of health issues from medical experts.

• Essent Medical Library A patient-oriented health resource provided by the Essent Healthcare system.

• Globalrph Provides drug information, intravenous drug dilution standards and online clinical dosing calculators for health care professionals.

• Harrison's Online Regularly updated online version of the medical textbook. Subscription required with free 4-week trial.

• HealthAmericaOnline.com Provides health information for the individual, physician and healthcare employee. Covers information on a variety of medical topics.

• HealthDigest.org Directory of resources covering health employment, pharmacy information, nutrition, education, and news.

• Healthsites UK A portal to medical and health information for patients and doctors. Access medical and NHS healthcare sites plus news, advice and complementary therapy resources.

• HospitalWeb Directory of medical resources for professionals.

• Library of the National Medical Society Links to various journals, online diagnosis, medical textbooks and atlases. Subscription required.

• Longevity Healthy Aging Research Group Information from this Canadian organisation on getting older and staying healthy.

• MDconsult Includes reference books, journal search, practice guidelines, patient education and drug information. Subscription required with free 10-day pass.

• MedConnect Information services with a clinical and practical focus for physicians and other health care professionals.