- Octanoic Acid
- Octoxinol 10
- Octreotide
- Octyl Gallate
- Octyldodecanol
- Oily Phenol Injection
- Olanzapine
- Olanzapine Embonate Monohydrate
- Olanzapine Orodispersible Tablets
- Olanzapine Tablets
- Oleic Acid
- Oleoyl Macrogolglycerides
- Oleyl Alcohol
- Olive Oil Ear Drops
- Olmesartan Medoxomil
- Olmesartan Tablets
- Olsalazine Sodium
- Omega-3-Acid Ethyl Esters 60
- Omega-3-Acid Ethyl Esters 90
- Omega-3-Marine Triglycerides
- Omeprazole
- Omeprazole Gastro-resistant Capsules
- Omeprazole Gastro-resistant Tablets
- Omeprazole Magnesium
- Omeprazole Oral Suspension
- Omeprazole Sodium
- Ondansetron Hydrochloride Dihydrate
- Ondansetron Injection
- Ondansetron Tablets
- Oral Rehydration Salts
- Orciprenaline Sulfate
- Organ Preservation Solutions
- Orphenadrine Citrate
- Orphenadrine Hydrochloride
- Orphenadrine Hydrochloride Tablets
- Oseltamivir Phosphate
- Ouabain
- Oxacillin Sodium Monohydrate
- Oxaliplatin
- Oxazepam
- Oxazepam Tablets
- Oxcarbazepine
- Oxeladin Hydrogen Citrate
- Oxetacaine
- Oxitropium Bromide
- Oxolinic Acid
- Oxybuprocaine Eye Drops
- Oxybuprocaine Hydrochloride
- Oxybutynin Hydrochloride
- Oxybutynin Oral Solution
- Oxybutynin Tablets
- Oxycodone Capsules
- Oxycodone Hydrochloride
- Oxycodone Injection
- Oxycodone Oral Solution
- Oxycodone Prolonged-release Tablets
- Oxygen
- Oxygen (93 per cent)
- Oxymetazoline Hydrochloride
- Oxytetracycline Calcium
- Oxytetracycline Capsules
- Oxytetracycline Dihydrate
- Oxytetracycline Hydrochloride
- Oxytetracycline Tablets
- Oxytocin
- Oxytocin Concentrated Solution
- Oxytocin Injection