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.
- Mexiletine 5 medicines: 5 alone
- Micafungin 11 medicines: 11 alone
- Miconazole 9 medicines: 7 alone · 2 in combination
- Midazolam 33 medicines: 33 alone
- Midodrine 9 medicines: 9 alone
- Midostaurin 1 medicine: 1 alone
- Mifamurtide 2 medicines: 2 alone
- Mifepristone 4 medicines: 4 alone
- Migalastat 1 medicine: 1 alone
- Miglustat 7 medicines: 7 alone
- Milrinone 5 medicines: 5 alone
- Minocycline 9 medicines: 9 alone
- Minoxidil 18 medicines: 18 alone
- Mirabegron 16 medicines: 16 alone
- Mirikizumab 5 medicines: 5 alone
- Mirtazapine 16 medicines: 16 alone
- Mirvetuximab soravtansine 1 medicine: 1 alone
- Misoprostol 10 medicines: 5 alone · 5 in combination
- Mitomycin 7 medicines: 7 alone
- Mitotane 3 medicines: 3 alone
- Mitoxantrone 3 medicines: 3 alone
- Mitratapide 1 medicine: 1 alone
- Mivacurium 1 medicine: 1 alone
- Mizolastine 1 medicine: 1 alone
- Mobocertinib 1 medicine: 1 alone
- Moclobemide 4 medicines: 4 alone
- Modafinil 4 medicines: 4 alone
- Modified live bovine viral diarrhoea virus type 1, non-cytopathic parent strain KE-9 and modified live bovine viral diarrhoea virus type 2, non-cytopathic parent strain NY-93 1 medicine: 1 alone
- Modified live porcine respiratory and reproductive syndrome virus 1 medicine: 1 alone
- Modified vaccinia Ankara - Bavarian Nordic (MVA-BN) virus 1 medicine: 1 alone
- Mogamulizumab 1 medicine: 1 alone
- Molnupiravir 1 medicine: 1 alone
- Molybdenum 1 medicine: 1 in combination
- Momelotinib 2 medicines: 2 alone
- Mometasone 32 medicines: 23 alone · 9 in combination
- Monensin (as monensin sodium) 1 medicine: 1 alone
- Monepantel 1 medicine: 1 alone
- Montelukast 22 medicines: 22 alone
- Moroctocog alfa 9 medicines: 9 alone
- Morphine 68 medicines: 67 alone · 1 in combination
- Morphine + Peppermint 1 medicine: 1 alone
- Mosunetuzumab 4 medicines: 4 alone
- Moxetumomab pasudotox 1 medicine: 1 alone
- moxidectin, sarolaner, pyrantel embonate 1 medicine: 1 alone
- Moxifloxacin 6 medicines: 6 alone
- Moxisylyte 1 medicine: 1 alone
- Moxonidine 14 medicines: 14 alone
- Mucopolysaccharide polysulfate 2 medicines: 2 in combination
- Mupirocin 8 medicines: 8 alone
- Mycophenolate mofetil 21 medicines: 21 alone
- Mycophenolic acid 6 medicines: 6 alone
- Mycoplasma hyopneumoniae, strain 7304 (Nexhyon), expressing the capsid protein of porcine circovirus type 2a, inactivated 1 medicine: 1 alone
- Mycoplasma synoviae strain MS-H 1 medicine: 1 alone
- Nabilone 3 medicines: 3 alone
- Nabumetone 4 medicines: 4 alone
- Nadolol 1 medicine: 1 alone
- Nafarelin 1 medicine: 1 alone
- Naftidrofuryl 4 medicines: 4 alone
- Naldemedine 1 medicine: 1 alone
- Nalmefene 1 medicine: 1 alone
- Naloxegol 2 medicines: 2 alone
- Naloxone 67 medicines: 25 alone · 42 in combination
- Naltrexone 3 medicines: 2 alone · 1 in combination
- Nandrolone 1 medicine: 1 alone
- Naphazoline 3 medicines: 2 alone · 1 in combination
- Naproxen 31 medicines: 28 alone · 3 in combination
- Naratriptan 5 medicines: 5 alone
- Natalizumab 3 medicines: 3 alone
- Nateglinide 2 medicines: 2 alone
- Nebivolol 6 medicines: 6 alone
- Necitumumab 1 medicine: 1 alone
- Nefopam 5 medicines: 5 alone
- Neisseria meningitidis group A polysaccharide conjugated to tetanus toxoid, Neisseria meningitidis group C polysaccharide conjugated to tetanus toxoid, Neisseria meningitidis group W-135 polysaccharide conjugated to tetanus toxoid, Neisseria meningitidis 1 medicine: 1 alone
- Neisseria meningitidis group C polysaccharide conjugated to tetanus toxoid, Neisseria meningitidis group A polysaccharide conjugated to tetanus toxoid, Neisseria meningitidis group Y polysaccharide conjugated to tetanus toxoid, Neisseria meningitidis 1 medicine: 1 alone
- Neisseria meningitidis serogroup B fHbp (recombinant lipidated fHbp (factor H binding protein)) subfamily A 1 medicine: 1 alone
- Neisseria meningitidis serogroup B fHbp (recombinant lipidated fHbp (factor H binding protein)) subfamily B 1 medicine: 1 alone
- Nelarabine 1 medicine: 1 alone
- Nelfinavir 1 medicine: 1 alone
- Nemolizumab 1 medicine: 1 alone
- Neomycin 8 medicines: 2 alone · 6 in combination
- Neomycin sulfate 5 medicines: 1 alone · 4 in combination
- Nepafenac 2 medicines: 2 alone
- Nerandomilast 2 medicines: 2 alone
- Neratinib 1 medicine: 1 alone
- Netarsudil 2 medicines: 1 alone · 1 in combination
- Netilmicin 7 medicines: 2 alone · 5 in combination
- Netupitant 3 medicines: 3 in combination
- Nevirapine 13 medicines: 13 alone
- Nicardipine 4 medicines: 4 alone
- Nicorandil 6 medicines: 6 alone
- Nicotinamide 25 medicines: 5 alone · 20 in combination
- Nicotine 85 medicines: 85 alone
- Nicotinic acid 1 medicine: 1 in combination
- Nifedipine 35 medicines: 34 alone · 1 in combination
- Nilotinib 8 medicines: 8 alone
- Nimodipine 3 medicines: 3 alone
- Nintedanib 12 medicines: 12 alone
- Nipocalimab 1 medicine: 1 alone
- Niraparib 4 medicines: 2 alone · 2 in combination
- Nirogacestat 2 medicines: 2 alone
Sources: the MHRA product information, the European Medicines Agency and the NHS Dictionary of Medicines and Devices (dm+d), NHS Business Services Authority.