Core Viewpoint - The Australian government has decided to block a $387.2 million takeover of Mayne Pharma by U.S. company Cosette Pharmaceuticals due to national security concerns, emphasizing the importance of protecting critical medical supplies [1] Company Summary - Mayne Pharma is facing a significant setback as its proposed acquisition by Cosette Pharmaceuticals has been halted by the Australian government [1] - The blocked takeover was valued at $387.2 million, indicating the scale of the transaction and its potential impact on the market [1] Industry Summary - The decision reflects growing scrutiny over foreign investments in the pharmaceutical sector, particularly regarding national security and the safeguarding of essential medical supplies [1] - This incident may signal a trend of increased regulatory oversight in the healthcare industry, particularly for companies involved in critical supply chains [1]