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PARIS (AP) — A French contraceptive maker said Tuesday its morning-after pill is ineffective when taken by women who weigh more than 80 kilograms (176 pounds).
The decision by HRA Pharma follows a publication of results of a study of levonorgestrel, one of the active ingredients in its Norlevo emergency contraceptive, said Frederique Welgryn, HRA Pharma's head of women's health.
The new warning also says that the drug's efficacy is reduced in women who weigh more than 75 kilograms (165 pounds), and it is ineffective in women who weigh more than 80 kilograms.
Dr. Diana Mansour, a spokeswoman for Britain's Faculty of Sexual and Reproductive Healthcare, said in overweight and obese women the drug probably gets absorbed into their fat more quickly and doesn't have enough time to work in their bodies.