The State Institute for Drug Control (SUKL) received information from Brazilian regulatory authorities about the occurrence of counterfeit batches of the medicinal product Enhertu. Three batches are involved: batch number 432221 with expiration 11/2026, batch number 43284 with expiration 11/2026, and batch number 432862 with expiration 12/2027. The medicinal product Enhertu is registered in the Czech Republic through a centralized procedure. The representative of the marketing authorization holder confirmed that these batches were not supplied to the market in the Czech Republic and were not identified in regular supply reports. SUKL requests all operators to immediately provide information about the occurrence of these batches via telephone or email.