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.
- Iopamidol 8 medicines: 8 alone
- Ioversol 5 medicines: 5 alone
- Ipilimumab 1 medicine: 1 alone
- Ipratropium 23 medicines: 20 alone · 3 in combination
- Iptacopan 1 medicine: 1 alone
- Irbesartan 76 medicines: 43 alone · 33 in combination
- Irinotecan 6 medicines: 6 alone
- Irinotecan anhydrous free-base 1 medicine: 1 alone
- Irinotecan pegylated liposomal 1 medicine: 1 alone
- Iris versicolor liquid extract 1 medicine: 1 in combination
- Iron 1 medicine: 1 in combination
- Iron dextran 1 medicine: 1 alone
- Iron(iii) ion, toltrazuril 1 medicine: 1 alone
- Iron sucrose 2 medicines: 2 alone
- Isatuximab 2 medicines: 2 alone
- Isavuconazole 3 medicines: 3 alone
- Isocarboxazid 1 medicine: 1 alone
- Isoflurane 4 medicines: 4 alone
- Isoleucine 8 medicines: 8 in combination
- Isometheptene 2 medicines: 2 in combination
- Isoniazid 10 medicines: 5 alone · 5 in combination
- Isoprenaline 3 medicines: 3 alone
- Isopropyl alcohol 4 medicines: 4 in combination
- Isopropyl myristate 13 medicines: 3 alone · 10 in combination
- Isosorbide dinitrate 7 medicines: 7 alone
- Isosorbide mononitrate 40 medicines: 40 alone
- Isotretinoin 14 medicines: 14 alone
- Ispaghula 2 medicines: 2 in combination
- Ispaghula husk 8 medicines: 7 alone · 1 in combination
- Itraconazole 8 medicines: 8 alone
- Ivabradine 31 medicines: 31 alone
- Ivacaftor 18 medicines: 7 alone · 11 in combination
- Ivermectin 2 medicines: 2 alone
- Ivosidenib 1 medicine: 1 alone
- Ivy leaf dry extract 2 medicines: 1 alone · 1 in combination
- Ixazomib 6 medicines: 6 alone
- Ixekizumab 5 medicines: 5 alone
- Japanese-encephalitis virus, inactivated (attenuated strain SA14-14-2 grown in vero cells) 1 medicine: 1 alone
- Juniper berry oil 4 medicines: 4 in combination
- Kaolin 2 medicines: 1 alone · 1 in combination
- Ketamine 9 medicines: 9 alone
- Ketoconazole 12 medicines: 12 alone
- Ketoprofen 16 medicines: 16 alone
- Ketorolac 6 medicines: 5 alone · 1 in combination
- Ketotifen 3 medicines: 3 alone
- L-arginine hydrochloride, L-lysine hydrochloride 1 medicine: 1 alone
- L-Aspartic acid 11 medicines: 3 alone · 8 in combination
- L-Cysteine 2 medicines: 2 in combination
- L-Glutamic acid 5 medicines: 5 in combination
- L-Histidine 11 medicines: 2 alone · 9 in combination
- L-Histidine hydrochloride monohydrate 1 medicine: 1 in combination
- L. interrogans serogroup Australis serovar Bratislava (strain As-05-073) 1 medicine: 1 in combination
- L. interrogans serogroup Icterohaemorrhagiae serovar Copenhageni (strain Ic-02-001) 1 medicine: 1 in combination
- L. kirschneri serogroup Grippotyphosa serovar Dadas (strain Gr-01-005) 1 medicine: 1 in combination
- L-Lysine monoacetate 3 medicines: 3 in combination
- L-Lysine monohydrate 2 medicines: 2 in combination
- L-Lysine monohydrochloride 1 medicine: 1 in combination
- L-Methionine 16 medicines: 4 alone · 12 in combination
- L-Ornithine hydrochloride 2 medicines: 2 in combination
- L-Phenylalanine 13 medicines: 1 alone · 12 in combination
- L-Proline 14 medicines: 2 alone · 12 in combination
- L-Serine 8 medicines: 8 in combination
- L-Threonine 13 medicines: 2 alone · 11 in combination
- L-Tryptophan 7 medicines: 7 in combination
- Labetalol 10 medicines: 10 alone
- Lacidipine 11 medicines: 11 alone
- Lacosamide 104 medicines: 104 alone
- Lactic acid 7 medicines: 7 in combination
- Lactulose 9 medicines: 9 alone
- Lamivudine 37 medicines: 18 alone · 19 in combination
- Lamotrigine 87 medicines: 87 alone
- Lanadelumab 4 medicines: 4 alone
- Landiolol 1 medicine: 1 alone
- Lanreotide 16 medicines: 16 alone
- Lansoprazole 9 medicines: 9 alone
- Lanthanum carbonate 8 medicines: 8 alone
- Lapatinib 1 medicine: 1 alone
- Lappa root 1 medicine: 1 in combination
- Laronidase 1 medicine: 1 alone
- laropiprant, nicotinic acid 3 medicines: 3 alone
- Larotrectinib 3 medicines: 3 alone
- Lasofoxifene tartrate 1 medicine: 1 alone
- Latanoprost 21 medicines: 13 alone · 8 in combination
- Lauromacrogol 400 5 medicines: 5 alone
- Lauromacrogols 3 medicines: 3 in combination
- Lazertinib 2 medicines: 2 alone
- Lebrikizumab 2 medicines: 2 alone
- Lecanemab 1 medicine: 1 alone
- Ledipasvir 4 medicines: 4 in combination
- Lefamulin acetate 2 medicines: 2 alone
- Leflunomide 23 medicines: 23 alone
- Leishmania infantum excreted secreted proteins 1 medicine: 1 alone
- Lemon oil terpeneless 1 medicine: 1 in combination
- Lenacapavir 2 medicines: 2 alone
- Lenalidomide 100 medicines: 100 alone
- Lenograstim 1 medicine: 1 alone
- Lenvatinib 7 medicines: 7 alone
- Lepirudin 1 medicine: 1 alone
- Leptospira interrogans serogroup Australis serovar Bratislava, strain MSLB 1088, L. interrogans serogroup Icterohaemorrhagiae serovar Icterohaemorrhagiae, strain MSLB 1089, L. interrogans serogroup Canicola serovar Canicola, strain MSLB 1090, L. 1 medicine: 1 alone
- Leptospira interrogans serogroup Canicola serovar Portland-vere (strain Ca-12-000), L. interrogans serogroup Icterohaemorrhagiae serovar Copenhageni (strain Ic-02-001), L. interrogans serogroup Australis serovar Bratislava (strain As-05-073), L. 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.