Come July 13, however, Fleischman will drop his final drug: a lethal dose of barbiturates.

With the assistance of the Swiss non-profit group Dignitas, Fleischman, 82, will commit legal suicide.

He drops things and does not know where his body is in space,” Mimi Fleischman, his wife of 27 years, told The Post.

His commitment to assisted suicide, Fleischman said, is not rash and has been percolating for at least two years.

“I came to the decision slowly,” he said.

ER doctors brought him back from the brink of death, but, soon after, “I read a book about ending life.

Instead, Mimi found Dignitas for Mark.

Dignitas launched in 1998 and is devoted to helping people commit suicide when their health is failing.

In the case of Fleischman, members of the organization reviewed his medical records and had a series of conversations with him.

“They want to be certain that I am making the decision for myself,” he said.

I provided all that and they said they want me over there.”.

“I fly out on July 8 and we do the death on the 13th,” he told The Post, explaining that, in typical Fleischman style, it will be a high-tone affair.

Now that he’s passed the psychological tests, said Fleischman, “I have what they call a provisional green light.” If, for some unforeseen reason, that were to change before his scheduled date, “I will tell them that I will jump out the window and leave a nasty note about how they tricked me into coming to Europe.”.

As to why he is going public with the news, Fleischman said: “At 82, I decided, why keep it a secret.

“I think people are ashamed [of assisted suicide].

He took on Studio 54’s debt and, in a later deal, transferred ownership of his Executive Hotel in Murray Hill to Schrager and Rubell, who turned it into the now shuttered Morgans, said to be the first boutique hotel in NYC.

Owning Studio, Fleischman recalled, was a blast.

“When you owned Studio 54, all of a sudden you became a semi celebrity,” said Fleischman.

They had a daughter Hilary — she remains close to her father but would not comment on-the-record about his decision — and divorced in the early 1990s after Fleischman got back into the nightlife business with a Midtown hotspot called Tatou

When the former president owned the Plaza Hotel in the early 1990s, Fleischman made a deal to open a club there called Gauguin

“I lost a couple hundred thousand [dollars],” Fleischman said

In 2017, Fleischman published a candid memoir, “Inside Studio 54” about his wild times — even taking out a $1 million libel-insurance policy should anyone sue him for spilling all the stories

He couldn’t walk either,” Fleischman said

“He said to me, ‘I want to die.’ I believed him.”

Having lost his parents and brother, Fleischman has shared his suicide plans with the remaining members of his immediate family

“The more I think about it, the more I want to do it,” he said