Active substances
2,443 active substances of the UK medicines whose patient leaflet or SPC is on this site, from A to Z – with the number of medicines containing the substance alone or in a combination with other substances.
- Nirsevimab 2 medicines: 2 alone
- Nitisinone 16 medicines: 16 alone
- Nitrazepam 7 medicines: 7 alone
- Nitric oxide 6 medicines: 6 alone
- Nitrofurantoin 29 medicines: 29 alone
- Nitrous oxide 6 medicines: 5 alone · 1 in combination
- Nivolumab 4 medicines: 4 alone
- Nizatidine 4 medicines: 4 alone
- Nomegestrol 3 medicines: 3 in combination
- Nonacog alfa 5 medicines: 5 alone
- Nonacog beta pegol 4 medicines: 4 alone
- Nonacog gamma 5 medicines: 5 alone
- Noradrenaline 6 medicines: 6 alone
- Norelgestromin 1 medicine: 1 in combination
- norelgestromin, ethinyl estradiol 1 medicine: 1 alone
- Norethisterone 9 medicines: 5 alone · 4 in combination
- Norethisterone acetate 9 medicines: 2 alone · 7 in combination
- Norethisterone enantate 1 medicine: 1 alone
- Norgestimate 2 medicines: 2 in combination
- Normal immunoglobulin human 24 medicines: 24 alone
- Nortriptyline 12 medicines: 12 alone
- Norway spruce extract 1 medicine: 1 alone
- Nusinersen 4 medicines: 4 alone
- Nutmeg oil 1 medicine: 1 in combination
- Nystatin 10 medicines: 5 alone · 5 in combination
- O Taiwan 3/97 ≥ 6 PD50* 1 medicine: 1 in combination
- O1 BFS ≥ 6 PD50* 1 medicine: 1 in combination
- Obeticholic acid 2 medicines: 2 alone
- Obiltoxaximab 2 medicines: 2 alone
- Obinutuzumab 1 medicine: 1 alone
- Oclacitinib maleate 1 medicine: 1 alone
- Ocrelizumab 2 medicines: 2 alone
- Ocriplasmin 2 medicines: 2 alone
- Octocog alfa 12 medicines: 12 alone
- Octreotide 22 medicines: 22 alone
- Odevixibat 4 medicines: 4 alone
- Oestrogens conjugated, bazedoxifene 1 medicine: 1 alone
- Ofatumumab 3 medicines: 3 alone
- Ofloxacin 3 medicines: 3 alone
- Olanzapine 123 medicines: 123 alone
- Olanzapine embonate 3 medicines: 3 alone
- Olaparib 4 medicines: 4 alone
- Olaratumab 1 medicine: 1 alone
- Oleic acid 2 medicines: 2 in combination
- Olezarsen 1 medicine: 1 alone
- Olive oil 12 medicines: 1 alone · 11 in combination
- Olmesartan 51 medicines: 25 alone · 26 in combination
- Olodaterol 3 medicines: 1 alone · 2 in combination
- Olopatadine 6 medicines: 4 alone · 2 in combination
- Olsalazine 8 medicines: 8 alone
- Omalizumab 13 medicines: 13 alone
- Omaveloxolone 1 medicine: 1 alone
- Ombitasvir, paritaprevir, ritonavir 1 medicine: 1 alone
- Omega-3-acid triglycerides 3 medicines: 3 in combination
- Omeprazole 55 medicines: 55 alone
- Onasemnogene abeparvovec 3 medicines: 3 alone
- Ondansetron 39 medicines: 39 alone
- One of the following inactivated bluetongue virus strains:Inactivated bluetongue virus, serotype 1, strain BTV-1/ALG2006/01 E1Inactivated bluetongue virus, serotype 8, strain BTV-8/BEL2006/02Inactivated bluetongue virus, serotype 4, strain SPA-1/2004 1 medicine: 1 alone
- Opicapone 5 medicines: 5 alone
- Orange tincture 4 medicines: 4 in combination
- orbifloxacin, Mometasone furoate, posaconazole 1 medicine: 1 alone
- Orforglipron 6 medicines: 6 alone
- Oritavancin 3 medicines: 3 alone
- Orlistat 9 medicines: 9 alone
- Orphenadrine 2 medicines: 2 alone
- Osaterone acetate 1 medicine: 1 alone
- Oseltamivir 11 medicines: 11 alone
- Osilodrostat 3 medicines: 3 alone
- Osimertinib 2 medicines: 2 alone
- Ospemifene 1 medicine: 1 alone
- Oteracil 1 medicine: 1 in combination
- Outer membrane vesicles from neisseria meningitidis group b (strain nz 98/254), recombinant Neisseria meningitidis group B fHbp fusion protein, recombinant Neisseria meningitidis group B NadA protein, recombinant Neisseria meningitidis group B NHBA … 1 medicine: 1 alone
- Oxalic acid dihydrate 2 medicines: 2 alone
- Oxalic acid dihydrate, formic acid 1 medicine: 1 alone
- Oxaliplatin 5 medicines: 5 alone
- Oxazepam 7 medicines: 7 alone
- Oxcarbazepine 23 medicines: 23 alone
- Oxerutins 1 medicine: 1 alone
- Oxprenolol 3 medicines: 3 alone
- Oxybutynin 22 medicines: 22 alone
- Oxycodone 201 medicines: 176 alone · 25 in combination
- Oxygen 20 medicines: 16 alone · 4 in combination
- Oxymetazoline 4 medicines: 4 alone
- Oxytetracycline 9 medicines: 7 alone · 2 in combination
- Oxytocin 9 medicines: 8 alone · 1 in combination
- Ozanimod 3 medicines: 3 alone
- Paclitaxel 7 medicines: 7 alone
- Paclitaxel albumin 6 medicines: 6 alone
- Padeliporfin di-potassium 2 medicines: 2 alone
- Palbociclib 10 medicines: 10 alone
- Palifermin 1 medicine: 1 alone
- Paliperidone 53 medicines: 53 alone
- Palivizumab 3 medicines: 3 alone
- Palonosetron 11 medicines: 8 alone · 3 in combination
- Palopegteriparatide 3 medicines: 3 alone
- Pamidronate disodium 7 medicines: 7 alone
- Pancreas powder 1 medicine: 1 alone
- Pancuronium 1 medicine: 1 alone
- Pandemic influenza vaccine (H5N1) (split virion, inactivated, adjuvanted) 1 medicine: 1 alone
- Panitumumab 1 medicine: 1 alone
Sources: the MHRA product information, the European Medicines Agency and the NHS Dictionary of Medicines and Devices (dm+d), NHS Business Services Authority.