Singer Miley Cyrus, who recently spent two weeks hospitalized for what she's said was an allergic reaction to antibiotics, dispelled rumors of a drug overdose Tuesday.

"I didn't have a drug overdose," she said at a news conference at the O2 Arena in London Tuesday, according to People magazine. "I took some [expletive] antibiotics that a doctor gave me for a sinus infection and I had a reaction."

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Cyrus, 21, who had to postpone several dates on the Bangerz tour that restarted with Tuesday night's show, said, "I'm probably the only one on this tour who doesn't drink or smoke before a show, as I take this really seriously. . . . It's almost like being an athlete being up here, because if someone was [expletive] up, they definitely couldn't do my show."

She said, "I'm the poster child for good health," adding, "You have no idea how ready I am. There is nothing I would rather not do than lay in a bed for two weeks. It was the most miserable two weeks of my life."

Cyrus, who was also announced Tuesday as a performer at the May 18 Billboard Music Awards, said she "kind of took the natural route" to wellness, crediting vitamins, yoga and honey for her recovery when conventional medication wasn't working, People reported.