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.

• Lercanidipine 17 medicines: 14 alone · 3 in combination
• Lesinurad 1 medicine: 1 alone
• Letermovir 6 medicines: 6 alone
• Letrozole 4 medicines: 4 alone
• Leucine 20 medicines: 2 alone · 18 in combination
• Leuprorelin 22 medicines: 22 alone
• Levetiracetam 160 medicines: 160 alone
• Levobunolol 2 medicines: 2 alone
• Levobupivacaine 9 medicines: 9 alone
• Levocarnitine 8 medicines: 8 alone
• Levocetirizine 6 medicines: 6 alone
• Levodopa 79 medicines: 9 alone · 70 in combination
• Levofloxacin 18 medicines: 17 alone · 1 in combination
• Levofolinic acid 2 medicines: 2 alone
• Levomenthol 20 medicines: 6 alone · 14 in combination
• Levomepromazine 9 medicines: 9 alone
• Levonorgestrel 33 medicines: 22 alone · 11 in combination
• Levothyroxine 43 medicines: 43 alone
• Lidocaine 54 medicines: 25 alone · 29 in combination
• Lidocaine hydrochloride 34 medicines: 22 alone · 12 in combination
• Linaclotide 1 medicine: 1 alone
• Linagliptin 12 medicines: 6 alone · 6 in combination
• Linezolid 8 medicines: 8 alone
• Linzagolix 2 medicines: 2 alone
• Liothyronine 11 medicines: 11 alone
• Lipase 17 medicines: 17 in combination
• Lipegfilgrastim 1 medicine: 1 alone
• Lipoteichoic acid from Biofilm Adhesion Component of Streptococcus uberis, strain 5616 1 medicine: 1 alone
• Liquid paraffin 25 medicines: 5 alone · 20 in combination
• Liquid paraffin light 7 medicines: 3 alone · 4 in combination
• Liquid sugar demineralised 1 medicine: 1 in combination
• Liquorice liquid extract 1 medicine: 1 in combination
• Liraglutide 11 medicines: 10 alone · 1 in combination
• Lisdexamfetamine 30 medicines: 30 alone
• Lisinopril 24 medicines: 13 alone · 11 in combination
• Lisocabtagene maraleucel 1 medicine: 1 alone
• Lithium carbonate 8 medicines: 8 alone
• Lithium chloride 1 medicine: 1 alone
• Lithium citrate 3 medicines: 3 alone
• Live aroA gene deleted Escherichia coli, type 078, strain EC34195 1 medicine: 1 alone
• Live attenuated Aujeszky's disease virus 1 medicine: 1 alone
• Live attenuated avian infectious bronchitis virus variant strain 4-91 1 medicine: 1 alone
• Live attenuated bovine respiratory syncytial virus (BRSV), strain Lym-56 1 medicine: 1 alone
• Live attenuated canine distemper virus strain Onderstepoort: 105.1 – 106.5 TCID50, Live recombinant canine parvovirus strain 630a: 105.1 – 106.7 TCID50 1 medicine: 1 alone
• Live attenuated infectious bursal disease virus (IBDV), strain 1052 1 medicine: 1 alone
• Live attenuated Muscovy duck parvovirus 1 medicine: 1 alone
• Live attenuated rabies virus, SAG2 strain 1 medicine: 1 alone
• Live avian infectious bronchitis virus, strain D388 1 medicine: 1 alone
• Live Bordetella bronchiseptica bacteria strain B-C2 1 medicine: 1 alone
• Live deletion-mutant Streptococcus equi strain TW928 1 medicine: 1 alone
• Live gE- tk- double-gene-deleted bovine herpes virus type 1, strain CEDDEL: 106.3–107.3 CCID50 1 medicine: 1 alone
• Live myxoma-vectored rabbit-haemorrhagic-disease virus strain 009 1 medicine: 1 alone
• Live myxoma vectored RHD virus strain 009, Live myxoma vectored RHD virus strain MK1899 1 medicine: 1 alone
• Live non-pathogenic Escherichia coli O141:K94 (F18ac) and O8:K87 (F4ac) 1 medicine: 1 alone
• Live non-pathogenic Escherichia coli O8:K87 1 medicine: 1 alone
• Live Recombinant E2 gene-deleted bovine viral diarrhoea virus containing classical swine fever virus E2 gene (CP7_E2alf) 1 medicine: 1 alone
• Live recombinant fowlpox virus expressing the membrane fusion protein and the encapsidation protein of avian infectious laryngotracheitis virus (rFP-LT) and avian encephalomyelitis virus, strain Calnek 1143 (AE) 1 medicine: 1 alone
• Live recombinant Marek’s disease (MD) virus, serotype 1, strain RN1250 1 medicine: 1 alone
• Live recombinant Marek’s disease virus, serotype 1, strain RN1250 1 medicine: 1 in combination
• Live recombinant turkey herpesvirus, expressing the VP2 protein of infectious bursal disease virus, strain vHVT013-69 1 medicine: 1 in combination
• Lixisenatide 6 medicines: 4 alone · 2 in combination
• Lodoxamide 1 medicine: 1 alone
• Lofepramine 4 medicines: 4 alone
• Lofexidine 1 medicine: 1 alone
• Lokivetmab 1 medicine: 1 alone
• Lomitapide 3 medicines: 3 alone
• Lomustine 1 medicine: 1 alone
• Lonapegsomatropin 9 medicines: 9 alone
• Loncastuximab tesirine 1 medicine: 1 alone
• Lonoctocog alfa 7 medicines: 7 alone
• Loperamide 34 medicines: 33 alone · 1 in combination
• Lopinavir 6 medicines: 6 in combination
• Loprazolam 1 medicine: 1 alone
• Loratadine 22 medicines: 22 alone
• Lorazepam 15 medicines: 15 alone
• Lorlatinib 2 medicines: 2 alone
• Lormetazepam 3 medicines: 3 alone
• Losartan 36 medicines: 20 alone · 16 in combination
• Loteprednol 1 medicine: 1 alone
• Lotilaner 1 medicine: 1 alone
• lotilaner, milbemycin oxime 1 medicine: 1 alone
• Loxapine 3 medicines: 3 alone
• Lumacaftor 5 medicines: 5 in combination
• Lumasiran 2 medicines: 2 alone
• Lumefantrine 1 medicine: 1 in combination
• Lupulus 1 medicine: 1 in combination
• Lurasidone 6 medicines: 6 alone
• Luspatercept 1 medicine: 1 alone
• Lusutrombopag 2 medicines: 2 alone
• Lutetium (177Lu) chloride 3 medicines: 3 alone
• Lutetium (177Lu) oxodotreotide 1 medicine: 1 alone
• Lutetium [Lu-177] chloride 1 medicine: 1 alone
• Lutetium [Lu-177] oxodotreotide 1 medicine: 1 alone
• Lutetium [Lu-177] vipivotide tetraxetan 1 medicine: 1 alone
• Lutropin alfa 6 medicines: 1 alone · 5 in combination
• Lymecycline 2 medicines: 2 alone
• Lysine 4 medicines: 4 in combination
• Macimorelin 3 medicines: 3 alone
• Macitentan 3 medicines: 3 alone
• Macrogol 3350 20 medicines: 10 alone · 10 in combination

Sources: the MHRA product information, the European Medicines Agency and the NHS Dictionary of Medicines and Devices (dm+d), NHS Business Services Authority.