A severe allergic reaction has forced pop superstar Miley Cyrus to cancel more shows, including her Friday night show in Nashville.
A rep for the singer told CNN Cyrus could be on medical rest for up to three weeks after she suffered a reaction to an antibiotic used to treat a sinus infection.
Cyrus has been hospitalized since Tuesday night in Kansas City and has had to cancel shows in Charlotte, Kansas City and St. Louis.
Late Thursday afternoon, Cyrus' publicist said in an email her Nashville concert will be postponed until August 7. Tickets previously purchased for Friday night's show will be honored at the August date.
Cyrus has also postponed her upcoming show in Louisville, Kentucky until August 9.
On Thursday morning,, the 21-year-old tweeted, "Over the hospital. I miss Bangerz tour."
In a second tweet, she wrote, "Can't quit crying. I [want to] go back on tour. I'm meant to be onstage performing for y'all.... not laying [sic] in a hospital bed."
For more information on Miley Cyrus, visit her Web site.