Scions of the embattled Purdue pharmaceutical family, Mortimer and Jacqueline Sackler, have fled New York for Europe amid the backlash over the opioid crisis — after selling their Upper East Side townhouse for nearly $40 million.

Mortimer, son of the late founder of Purdue Pharma and a former board member of the company that makes Oxycontin, announced his side of the family is leaving to spend the winter months in the ritzy Swiss ski resort Gstaad.

The move comes just after Mortimer and Jacqueline — once Manhattan society staples — sold their townhouse on East 75th Street for $38 million to billionaire hedge funder Israel Englander in an off-market deal that closed on Jan. 3.

Meanwhile, Purdue Pharma filed for bankruptcy protection in New York last September amid a nationwide rash of lawsuits against the company alleging it contributed to and profited wildly from the deadly US opioid epidemic.

In a shameless Jan. 22 email blast to New York friends, Mortimer announced the family’s move: “Jackie, Oscar (our 5 year old) and I are spending the winter term in Gstaad. We will also take the opportunity of being based here to travel in Europe. We would love to see you either in Gstaad, if you are here or nearby, or elsewhere in Europe (taking advantage of the ease of travel here vs ours in NYC).”

He continued, “Do let us know what your plans are, and what you have been up to as we would love to catch up. Wishing you all the best for a Healthy and Happy 2020, Mortimer and Jacqueline.”

The Sacklers deny allegations from the New York Attorney General’s Office that the family was shifting Purdue money through Swiss bank accounts and that they hid the sale of their townhouse.

A spokesperson for Mortimer said: “The New York AG has been provided with full information about all family assets, including the family’s townhouse, and any suggestion otherwise is false. To be clear, no proceeds from the recent sale of the townhouse have been transferred out of the US. The Sacklers are spending the winter at a home that has been in their family for generations. They fully intend to return to the US in the near future.”

And “With respect to your recycled reference to decades-old transfers, as we stated previously, they were perfectly legal and appropriate in every respect. There was nothing newsworthy about them then and there is nothing newsworthy about them now.”

We exclusively reported last year that fellow family members David and Joss Sackler were fleeing town for Florida.