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Orthopedist No. 3 put me on sulfamethoxazole/trimethoprim and cephalexin, which seemed to work, or so I convinced myself.

Cyrus’ rep says the singer suffered from a sinus infection last week during her “Bangerz” tour and had “an extreme allergic reaction” to the antibiotic cephalexin on Tuesday.

The "Wrecking Ball" singer, who has canceled shows in Kansas City, Missouri, and St. Louis earlier this week, posted a statement on Twitter saying she suffered an allergic reaction to the antibiotic cephalexin.

This family of antibiotics, which includes brands such as Keflex and the generic cephalexin, are used to treat illnesses, including pneumonia and salmonella infections in children.

After two to three days, 97 percent of those on clindamycin had improved, and so had 94 percent of those on cephalexin.