• OBLink - Tractocile Evidence based resource for obstetricians and women on maternal fetal medicine and especially on epidemiology, prevention and treatment of preterm labour. It provides a discussion forum, tutorials, and congress reporting for physicians and consumers.

• Octreotide IM injection ( Sandostatin LAR ) International site for this medication used for Acromegaly. Includes information on Acromegaly, GEP tumors, case studies, physicians roster, journal articles, and slide library.

• Ortho Tri-Cyclen Norgestimate and ethinyl estradiol. Features information for US residents and health care providers including product details, prescribing information, FAQs, acne facts, and description of available pill compacts.

• OxyAbuseKills.com Aims to bring awareness on how easy it is to overdose on the opiate OxyContin. Features background, personal stories, FAQs, overdose information, and details on how to battle it.

• Oxybutynin Chloride ( Ditropan XL ) A prescription drug for the treatment of overactive bladder. Includes manufacturer's prescribing information and feedback forms.

• Oxytrol Official Pharmaceutical Web site - Watson Pharma, Inc.