O
Obesity Obsessive-Compulsive Disorder (OCD) Onychomycosis (Fungal Nail) Ophthalmia Neonatorum: Chlamydial Ophthalmia Neonatorum: Gonococcal Opioid Dependence, Opioid Use Disorder (OUD), Opioid Withdrawal Syndrome Opioid-Induced Constipation (OIC) Opioid-Induced Nausea/Vomiting (OINV) Opioid Overdose/Opioid Reversal Organ Transplant Rejection Prophylaxis (OTRP) Osgood-Schlatter Disease Osteoarthritis (OA), Ankylosing Spondylitis Osteoporosis Otitis Externa Otitis Media: Acute Otitis Media: Serous (SOM), Otitis Media With Effusion Ovulation Induction