The US singer was to perform two dates in Mexico in September and several November dates in South America.
Live Nation said in a statement: “Unfortunately, Demi Lovato has canceled her upcoming ‘Tell Me You Love Me’ tour dates in South America, as she is focusing on her recovery.
“Tickets will be available at the point of purchase and credit card purchases will automatically be refunded.”
Only July 24 the pop star was discovered unconscious at her Hollywood Hills home.
According to reports, naloxone, which counteracts the effects of opioid overdose, was administered by paramedics.
July performances in New Jersey, Atlantic City, Toronto and Ontario, Canada were also cancelled after Lovato’s hospitalisation.
- Read more: Pop Is Not A Dirty Word: Demi Lovato told us about her relapse. How did the pop machine let her down so badly?
Lovato wrote on her Instagram on Sunday (August 5) that she now needs “time to heal” and to “focus on my sobriety and road to recovery.”
“I have always been transparent about my journey with addiction,” she wrote in the post.
“What I’ve learned is that this illness is not something disappears or fades with time. It is something I must continue to overcome and have not done yet.”
In the message she also thanked God, her fans, family, team and the staff at Cedars-Sinai Hospital where she has received treatment.
“I will keep fighting,” she wrote at the end.