Novartis has been served with a $225 million class action lawsuit brought by former employees over allegedly unpaid overtime payments, according to a Wall Street Journal report.

The lawsuit has been brought by former sales representatives and is headed by Simona Lopes, according to Sanford, Wittels & Heisler, the lawfirm representing the plaintiffs. It claims that Novartis filed to pay overtime when Lopes and colleagues worked more than 40 hours a week.

Novartis has declined to comment on the case as it has not yet been served with the suit. It is also facing a class action sexual harrassement suit, brought by the same firm, claiming $100 million.

Lawsuits seeking damages for unpaid overtime are on the increase in the USA, and companies have paid out more than $1 billion in settlements since 2002.