- Obeticholic Acid
- Obinutuzumab Injection
- Ocaliva®see Obeticholic Acid
- Ocella® (as a combination product containing Drospirenone, Ethinyl Estradiol)see Estrogen and Progestin (Oral Contraceptives)
- Ocrelizumab Injection
- Ocrevus®see Ocrelizumab Injection
- Octreotide
- Octreotide Injection
- Ocu-Cort® (as a combination product containing Bacitracin Zinc, Hydrocortisone, Neomycin, Polymyxin B Sulfates)see Bacitracin Ophthalmic
- Ocu-Mycin®see Gentamicin Ophthalmic
- Ocu-Tropine®see Atropine Ophthalmic
- Ocufen®see Flurbiprofen Ophthalmic
- Ocuflox®see Ofloxacin Ophthalmic
- Odefsey® (as a combination product containing Emtricitabine, Rilpivirine, Tenofovir)see Emtricitabine, Rilpivirine, and Tenofovir
- Odevixibat
- Odomzo®see Sonidegib
- Ofatumumab Injection (Chronic Lymphocytic Leukemia)
- Ofatumumab Injection (Multiple Sclerosis)
- Ofev®see Nintedanib
- Ofirmev®see Acetaminophen Injection
- Ofloxacin
- Ofloxacin Ophthalmic
- Ofloxacin Otic
- Ogen® Creamsee Estrogen Vaginal
- Ogen® Tablets (estropipate)see Estrogen
- Ogestrel® (as a combination product containing Ethinyl Estradiol, Norgestrel)see Estrogen and Progestin (Oral Contraceptives)
- Ogivri® (trastuzumab-dkst)see Trastuzumab Injection
- Ogsiveo®see Nirogacestat
- Ohtuvayre®see Ensifentrine Oral Inhalation
- Ojjaara®see Momelotinib
- Ojmeda®see Tovorafenib
- Olanzapine
- Olanzapine and Samidorphan
- Olanzapine Injection
- Olaparib
- Olaratumab Injection
- Oleptro®see Trazodone
- Oliceridine Injection
- Olinvyk®see Oliceridine Injection
- Olmesartan
- Olodaterol Oral Inhalation
- Olopatadine Nasal Spray
- Olopatadine Ophthalmic
- Olsalazine
- Olumiant®see Baricitinib
- Olutasidenib
- Olux®see Clobetasol Topical
- Olysio®see Simeprevir
- Omacetaxine Injection
- Omadacycline
- Omadacycline Injection
- Omalizumab Injection
- Ombitasvir, Paritaprevir, and Ritonavir
- Ombitasvir, Paritaprevir, Ritonavir, and Dasabuvir
- Omeclamox-Pak®see Omeprazole, Clarithromycin, and Amoxicillin
- Omega-3 Fatty Acids
- Omeprazole
- Omeprazole, Clarithromycin, and Amoxicillin
- Omidenepag Isopropyl Ophthalmic
- Omlonti®see Omidenepag Isopropyl Ophthalmic
- Omnaris®see Ciclesonide Nasal Spray
- Omnicef®see Cefdinir
- Omnihist II LA® (as a combination product containing Chlorpheniramine, Methscopolamine, Phenylephrine)see Phenylephrine
- Omnihist® LA (as a combination product containing Chlorpheniramine Maleate, Methscopolamine Nitrate, and Phenylephrine Hydrochloride)see Chlorpheniramine
- Omnipen®see Ampicillin
- Omnipen-N®see Ampicillin Injection
- Omnipred®see Prednisolone Ophthalmic
- Omnitrope®see Somatropin
- Omtryg®see Omega-3 Fatty Acids
- Omvoh®see Mirikizumab-mrkz Injection
- OnabotulinumtoxinA Injection
- Oncaspar®see Pegaspargase Injection
- Oncovin®see Vincristine Injection
- Ondansetron
- Ondansetron Injection
- Onfi®see Clobazam
- Ongentys®see Opicapone
- Onglyza®see Saxagliptin
- Onivyde®see Irinotecan Lipid Complex Injection
- Onmel®see Itraconazole
- Onsolis®see Fentanyl
- Ontak®see Denileukin Diftitox Injection
- Onturzant® (trastuzumab-dttb)see Trastuzumab Injection
- Onureg®see Azacitidine
- Onyda® XRsee Clonidine
- Onzetra Xsail® Nasal Powdersee Sumatriptan Nasal
- Opalescence®see Fluoride
- Opana®see Oxymorphone
- Opana® ERsee Oxymorphone
- Opcicon® One-Stepsee Levonorgestrel
- Opdivo®see Nivolumab Injection
- Opdualag®see Nivolumab and relatlimab-rmbw
- Opfolda®see Miglustat
- Opicapone
- Opill®see Progestin-Only (norgestrel) Oral Contraceptives
- Opsumit®see Macitentan
- Opsynvi®see Macitentan and Tadalafil
- Optigene® 3see Tetrahydrozoline Ophthalmic
- OptiPranolol®see Metipranolol Ophthalmic
- Optivar®see Azelastine Ophthalmic
- Opuviz® (aflibercept-yszy)see Aflibercept Injection
- OPVsee Polio Vaccine
- Opvee®see Nalmefene Nasal Spray
- Opzelura®see Ruxolitinib Topical
- Ora-Line®see Fluoride
- Ora-Testryl®see Fluoxymesterone
- Oracea®see Doxycycline
- Oral Defense®see Fluoride
- Oral-B®see Fluoride
- Oralone® Dental Pastesee Triamcinolone Topical
- Oramorph® SRsee Morphine
- Orap®see Pimozide
- Orapred®see Prednisolone
- Orasone®see Prednisone
- Oratuss® (as a combination product containing Carbetapentane, Guaifenesin, Phenylephrine)see Phenylephrine
- Oravig®see Miconazole Buccal
- Orbactiv®see Oritavancin Injection
- Orencia®see Abatacept Injection
- Orenitram®see Treprostinil
- Oretic®see Hydrochlorothiazide
- ORGAN-I NR®see Guaifenesin
- Orgatrax®see Hydroxyzine
- Orgovyx®see Relugolix
- Oriahnn®see Elagolix, Estradiol, and Norethindrone
- Orilissa®see Elagolix
- Orinase®see Tolbutamide
- Oritavancin Injection
- Orkambi®see Lumacaftor and Ivacaftor
- Orlistat
- Orphenadrine
- Orphengesic® (as a combination product containing Aspirin, Caffeine, Orphenadrine)see Orphenadrine
- Orphengesic® (as a combination product containing Aspirin, Caffeine, Orphenadrine)see Aspirin
- Orserdu®see Elacestrant
- Ortho Guard®see Fluoride
- Ortho Tri-Cyclen® (as a combination product containing Ethinyl Estradiol, Norgestimate)see Estrogen and Progestin (Oral Contraceptives)
- Ortho Tri-Cyclen® Lo (as a combination product containing Ethinyl Estradiol, Norgestimate)see Estrogen and Progestin (Oral Contraceptives)
- Ortho-Cept® (as a combination product containing Desogestrel, Ethinyl Estradiol)see Estrogen and Progestin (Oral Contraceptives)
- Ortho-Cyclen® (as a combination product containing Ethinyl Estradiol, Norgestimate)see Estrogen and Progestin (Oral Contraceptives)
- Ortho-est® (estropipate)see Estrogen
- Ortho-Novum® 1/35 (as a combination product containing Ethinyl Estradiol, Norethindrone)see Estrogen and Progestin (Oral Contraceptives)
- Ortho-Novum® 1/50 [DSC] (as a combination product containing Mestranol, Norethindrone)see Estrogen and Progestin (Oral Contraceptives)
- Orudis®see Ketoprofen
- Orudis® KTsee Ketoprofen
- Oruvail®see Ketoprofen
- Orvaten®see Midodrine
- Os-Cal 500®see Calcium Carbonate
- Oscimin®see Hyoscyamine
- Oscion®see Benzoyl Peroxide Topical
- Oseltamivir
- Oseni® (as a combination product containing Alogliptin, Pioglitazone)see Alogliptin
- Oseni® (as a combination product containing Alogliptin, Pioglitazone)see Pioglitazone
- Osimertinib
- Osmolex ER®see Amantadine
- OsmoPrep,®see Sodium Phosphate
- Ospemifene
- Osphena®see Ospemifene
- Oteseconazole
- Otezla®see Apremilast
- Otiprio®see Ciprofloxacin Otic
- Otrexup®see Methotrexate Injection
- Ovcon® (as a combination product containing Ethinyl Estradiol, Norethindrone)see Estrogen and Progestin (Oral Contraceptives)
- Ovide®see Malathion Topical
- Ovrette®see Progestin-Only (norethindrone) Oral Contraceptives
- Oxacillin Injection
- Oxaliplatin Injection
- Oxandrin®see Oxandrolone
- Oxandrolone
- Oxaprozin
- Oxaydo®see Oxycodone
- Oxazepam
- Oxbryta®see Voxelotor
- Oxcarbazepine
- Oxervate®see Cenegermin-bkbj Ophthalmic
- Oxiconazole
- Oxilapinesee Loxapine
- Oxistat®see Oxiconazole
- Oxtellar XR®see Oxcarbazepine
- Oxy 10®see Benzoyl Peroxide Topical
- Oxy® Clinical Advanced Face Washsee Salicylic Acid Topical
- Oxy® Maximum Cleansing Padssee Salicylic Acid Topical
- Oxybate Sodiumsee Sodium Oxybate
- Oxybutynin
- Oxybutynin Topical
- Oxybutynin Transdermal Patch
- Oxycet® (as a combination product containing Acetaminophen, Oxycodone)see Oxycodone
- Oxycodone
- Oxycontin®see Oxycodone
- Oxymetazoline Nasal Spray
- Oxymetazoline Topical
- Oxymorphone
- Oxytocin Injection
- Oxytrol®see Oxybutynin Transdermal Patch
- Ozanimod
- Ozempic®see Semaglutide Injection
- Ozenoxacin
- Ozobax®see Baclofen
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