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.

• Voriconazole 25 medicines: 25 alone
• Vortioxetine 15 medicines: 15 alone
• Vosoritide 1 medicine: 1 alone
• Voxelotor 1 medicine: 1 alone
• Vutrisiran 1 medicine: 1 alone
• Warfarin 8 medicines: 8 alone
• Water 5 medicines: 5 alone
• West Nile recombinant canarypox virus (vCP2017 virus) 1 medicine: 1 alone
• White soft paraffin 13 medicines: 4 alone · 9 in combination
• Whole virion, inactivated, containing antigen*: A/Vietnam/1194/2004 (H5N1)* produced in eggs 1 medicine: 1 alone
• Whole virion influenza vaccine, inactivated containing antigen of strain A/California/07/2009 (H1N1)v 1 medicine: 1 alone
• Wintergreen oil 2 medicines: 2 in combination
• Wool fat 3 medicines: 3 in combination
• Wool fat hydrous 1 medicine: 1 in combination
• Xipamide 1 medicine: 1 alone
• Xylometazoline 13 medicines: 12 alone · 1 in combination
• Yellow soft paraffin 2 medicines: 2 in combination
• Yttrium (90Y) chloride 2 medicines: 2 alone
• Zaleplon 2 medicines: 2 alone
• Zanamivir 2 medicines: 2 alone
• Zanidatamab 1 medicine: 1 alone
• Zanubrutinib 2 medicines: 2 alone
• Ziconotide 2 medicines: 2 alone
• Zidovudine 12 medicines: 7 alone · 5 in combination
• Zilucoplan 2 medicines: 2 alone
• Zinc 2 medicines: 1 alone · 1 in combination
• Zinc acetate 4 medicines: 2 alone · 2 in combination
• Zinc acetate dihydrate 5 medicines: 1 alone · 4 in combination
• Zinc chloride 4 medicines: 4 in combination
• Zinc gluconate 4 medicines: 3 alone · 1 in combination
• Zinc oxide 25 medicines: 4 alone · 21 in combination
• Zinc sulfate 3 medicines: 1 alone · 2 in combination
• Zinc undecenoate 2 medicines: 2 in combination
• Zolbetuximab 2 medicines: 2 alone
• Zoledronic acid 33 medicines: 33 alone
• Zoledronic acid, zoledronic acid monohydrate 1 medicine: 1 alone
• Zolmitriptan 13 medicines: 13 alone
• Zolpidem 11 medicines: 11 alone
• Zonisamide 47 medicines: 47 alone
• Zopiclone 10 medicines: 10 alone
• Zuclopenthixol 5 medicines: 5 alone
• Zuclopenthixol acetate 1 medicine: 1 alone
• Zuclopenthixol decanoate 5 medicines: 5 alone

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