- Obestat Brand
- Obimin Brand
- Obimin-AF Brand
- Obinutuzumab Generic
- Obroxol Brand
- OC Eight/OC8 Brand
- Ocle Brand
- Octocog alfa Generic
- Octopamine Generic
- Octostim Brand
- Octreotide Generic
- Octreotide-Hospira Brand
- Oculosan Brand
- Ocuvite AREDS 2 Formula 特效博士康維生素AREDS 2升級配方 Brand
- Ocuvite Lutein 博視康黃斑維生素 Brand
- Ocuvite PreserVision Brand
- Odefsey Brand
- Odicoza Brand
- Odistad 120 Brand
- Oestrogel Brand
- Ofatumumab Generic
- Ofev 抑肺纖 Brand
- Oflamed Brand
- Ofloxacin Generic
- Ofloxacin Daewon Brand
- Oftan Timolol Brand
- Ofus Brand
- Oilatum Soothe & Protect Oilatum 紓緩防護系列 Brand
- Oilatum/Oilatum Emollient 愛麗她 Brand
- Okacin Brand
- Okavax Brand
- Olanza Brand
- Olanzapine Generic
- Olanzapine + Fluoxetine Generic
- Olbetam Brand
- Olfen Brand
- Olfen Gel Brand
- OliClinomel N4-550E/OliClinomel N7-1000E Brand
- Olimel N9E/PeriOlimel N4E Brand
- Olive oil Generic
- Olmecor Brand
- Olmesartan Generic
- Olmesartan + Amlodipine Generic
- Olmesartan + Amlodipine + Hydrochlorothiazide Generic
- Olmesartan + Hydrochlorothiazide Generic
- Olmesartan Sandoz Brand
- Olmetec Brand
- Olmetec Plus Brand
- Olodaterol Generic
- Olopatadine Generic
- Olsalazine Generic
- Olumiant Brand
- Olza-5/Olza-10 Brand
- Omacetaxine mepesuccinate Generic
- Omacor Brand
- Omalizumab Generic
- Omega 3-6-9 Jamieson/Omega-3 Complete Jamieson Brand
- Omega-3 Hovid Brand
- Omega-3 triglycerides Generic
- Omegaflex Peri/Omegaflex Special Brand
- Omegaven Brand
- Omep Brand
- Omeprazole Generic
- Omezole Brand
- Omidenepag Generic
- Omizec Brand
- Omnaris Brand
- Omoconazole Generic
- Onbrez Breezhaler Brand
- Oncaspar HIGHLIGHT Brand
- Ondansetron Generic
- Ondansetron Fresenius Brand
- Ondansetron Kabi Brand
- Ondansetron-Teva Brand
- One-Alpha Brand
- OneTouch Select Plus Blood Glucose Monitoring System Brand
- OneTouch Ultra Plus Flex Blood Glucose Monitoring System Brand
- Onexton Brand
- Onglyza Brand
- Onzapin Brand
- Onzapin OD Brand
- Opcon-A 博士倫眼康 Brand
- Opdivo Brand
- Ophtamolol Brand
- Ophtaxia Eye Wash 博士倫眼潔洗眼水 Brand
- Opipramol Generic
- Oprelvekin Generic
- Opsumit Brand
- Optibarrier Brand
- Optifast Brand
- OptiFibre 纖維樂 Brand
- OptiFibre Flora Brand
- Optigen Brand
- Optive Brand
- Optive Advanced Brand
- Optive Sensitive Brand
- Optizoline Brand
- Optrex Brand
- Oragesic 口康適 Brand
- Oral Impact 速癒素 Brand
- Oral Impact Ready-To-Drink 速癒素(即飲裝) Brand
- Oral Peace Clean & Moisture Brand
- Oral Rehydration Salts Brand
- Oral Rehydration Salts New Formula Brand
- Oralite Oral Rehydration Salts Brand
- Oramedy 腔痊 Brand
- Orap/Orap Forte Brand
- Ora-Sed Brand
- Oratane Brand
- Orciprenaline Generic
- Orencia Brand
- Orgalutran Brand
- Orgotein Generic
- Orlasil Brand
- Orlistat Generic
- Ormeloxifene Generic
- Ornidazole Generic
- Orochol E Berna Brand
- Orphenadrine Generic
- Orphenadrine + Paracetamol Generic
- Orrepaste Brand
- Orton Brand
- Orudis IM Brand
- Orvakline Brand
- Osamine-S Brand
- Osarstad 80 Brand
- Osartil Brand
- Osartil 50 Plus/Osartil 100 Plus Brand
- Os-Cal 250 + D 蠔貝鈣片 Brand
- Osco Pocato Brand
- Osco Xuzulex Nasal Spray Brand
- Oseltamivir Generic
- Oseni 愛適糖 Brand
- Osmolite 康營素 Brand
- Osmolite-HN 保營素HN Brand
- Ospamox Brand
- Ospen Brand
- Ospexin Brand
- Ostenil Tendon Brand
- Ostenil/Ostenil Mini/Ostenil Plus Brand
- Osteocare 維她補鈣 Brand
- Osteodiol Brand
- Osteofos Brand
- OsteVit-D Kids Drops Brand
- Oteracil potassium Generic
- Otilonium bromide Generic
- Otosporin Brand
- Otozambon Brand
- Otrivin 安鼻靈 Brand
- Otrivin Duo 安鼻靈雙效配方 Brand
- Otrivin Paed Nasal Drops Brand
- Otrivin Seawater 安鼻靈潔鼻海泉 Brand
- Ovastar Brand
- Ovidrel Brand
- Oxaceprol Generic
- Oxacillin Generic
- Oxair Brand
- Oxaliplatin Generic
- Oxaliplatin Ebewe Brand
- Oxaliplatin Hovid Brand
- Oxaliplatin-Pfizer Brand
- Oxaliplatin-Teva Brand
- Oxandrolone Generic
- Oxantel Generic
- Oxaprozin Generic
- Oxatomide Generic
- Oxazepam Generic
- Oxcarbazepine Generic
- Oxedrine Generic
- Oxema Improved Brand
- Oxiconazole Generic
- Oxiracetam Generic
- Oxis Brand
- Oxolinic acid Generic
- Oxomemazine Generic
- Oxprenolol Generic
- Oxsoralen Brand
- Oxybuprocaine Generic
- Oxybutynin Generic
- Oxycodone Generic
- Oxycodone + Naloxone Generic
- Oxycontin Brand
- Oxyfedrine Generic
- Oxylim Brand
- Oxymetazoline Generic
- Oxymetholone Generic
- Oxy-Nase Paediatric Nasal Spray Brand
- OxyNorm Capsule Brand
- OxyNorm Injection Brand
- OxyNorm Liquid/OxyNorm Concentrate Brand
- Oxyphenbutazone Generic
- Oxyphencyclimine Generic
- Oxyphenonium Generic
- Oxytetracycline Generic
- Oxytocin Generic
- Oxytocin + Ergometrine Generic
- Ozapex Brand
- Ozempic Brand
- Ozurdex Brand