Diseases and Disorders
- Octreotide, for acromegaly
- Olanzapine, for Alzheimer disease
- Omacetaxine, for chronic leukemia
- Onabotulinum toxin A, for esophageal diverticula
- Opioid antagonist, for narcotic abuse
- Oral ulcers, in lupus erythematosus
- Organ dysfunction syndrome
- Organ System Involvement in MODS
- Osteoarthritis
- Osteomyelitis
- Osteopenia, in hyperparathyroidism
- Ostomy care, after colorectal cancer surgery
- Otitis media
- Ovarian cancer
- Oxazepam, for psychoactive substance abuse
- Oximetry, pulse, in laryngotracheobronchitis
- Oxybutynin chloride, for neurogenic bladder
- Oxycodone, for tendinitis