The Japanese firm announced it was withdrawing the pain killer - batch number 11255945 – last Thursday (here in Danish), explaining the move was prompted by the discovery of “non-paracetamol’ tablets were found in two containers.
Takeda also said it had notified all distributors and has launched an investigation into the incident.
The firm did not respond to a request for more information.
The Danish Medicines Agency (DKMA) warned patients (here in Danish) not to take the medicines.
It confirmed that tests had identified the unknown pills as the non-steroidal anti-inflammatory ibuprofen, which Takeda sells as Ibumetin.
The regulator said: "You should not take any of the tablets, if you have one of the containers from that batch" advising patients to retun the products.
A spokeswoman for the Japanese firm told us that the recallede batch was not produced by a third party manufacturer.
"Investigations into the incident are still ongoing. The recalled batch was produced by Takeda" she said.
The headline has been revised to clarify that the ibuprofen was not found by patients.