Where is Mounjaro Made?
Who Supplies Mounjaro to the UK?
Mounjaro is manufactured by Eli Lilly, a major U.S. pharmaceutical company. While the drug is produced overseas, it is supplied legally in the UK through Lilly’s UK affiliate, Eli Lilly, which is responsible for importing the medicine and coordinating its distribution to pharmacies and healthcare providers.
Manufacturing, Pen Filling, and Packaging for Europe
Mounjaro sold in the UK is imported from Eli Lilly’s global manufacturing network. The active pharmaceutical ingredient (tirzepatide) is primarily produced in the United States, where specialised facilities create the peptide under strict quality controls. In some cases, additional peptide synthesis may take place in European partner facilities in Ireland or Switzerland, to support the global supply chain.
Once the active ingredient is manufactured, it is transported to formulation and pen-filling facilities in the United States and Italy. Here, tirzepatide is combined with the stabilising solution and filled into pre-filled injection pens, which are then subjected to quality checks to ensure correct dosing and sterility.
For the European market, including the UK, the pens are then shipped to final packaging and assembly facilities in Ireland and Spain. At these sites, the pens are boxed, labelled, and prepared for distribution across Europe. This process ensures that every pen meets regulatory standards and is safely packaged for transport under cold-chain conditions
Distribution in the UK
Once Mounjaro is imported into the UK, it is distributed through licensed wholesalers who specialise in temperature-sensitive medicines. These wholesalers deliver the medication to GPhC-registered pharmacies, NHS dispensaries, and accredited online pharmacies. Maintaining the cold chain is essential to preserve the quality and efficacy of the medicine.