https://www.addictioncenter.com/news/2021/03/demi-lovato-addiction-overdose-documentary/
Lovato says at that point they began using heroin recreationally and became physically dependent on it. Heroin is a powerful opioid drug made from morphine that comes with severe heroin withdrawal symptoms, such as muscle and bone pain, diarrhea and vomiting, cold flashes, and uncontrollable leg movements.
The night of the overdose, Lovato shares that they told their friends they were going up to bed, but actually went upstairs to call a dealer. Lovato used Heroin that they now assume was actually fentanyl. After providing the drugs and taking advantage of Lovato, the dealer left Lovato alone. When Lovato’s assistant found Lovato in the morning, Lovato was naked and blue. At 11:22am on July 24, 2018, a 911 call was made and paramedics rushed to the house, administering Narcan trying to save Lovato’s life.
The overdose caused Lovato to suffer 3 strokes and a heart attack.