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Sexual Side Effects Added To Merck Drug Labels

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Prescribing labels for Merck & Co's drugs for baldness and enlarged prostate will add reports of sexual side effects that continued after use of the medicines was stopped, U.S. health regulators said.

 

Labels will be revised for Proscar, which treats symptoms of enlarged prostate, and hair-loss treatment Propecia, the Food and Drug Administration said. The active ingredient in both drugs is finasteride.

 

Propecia-hair-loss.jpg

The Propecia label will now include notification of problems with libido, ejaculation and orgasms that continued after use of the drug was ended. Proscar's label will include notification of decreased libido.

 

The labels of both drugs will also include a description of reports of male infertility and poor semen quality that normalized or improved after use of the drugs was stopped.

In announcing the label changes, FDA cited events reported to the agency.

 

"The cases suggest a broader range of adverse effects than previously reported in patients taking these drugs," FDA said in a notification posted on its website. But it also said no clear causal links between finasteride and sexual adverse events had been established.

 

FDA said sexual side effects were included in the labels of both drugs when they were approved in the 1990s. But in subsequent clinical trials, the side effects were resolved in patients who stopped using the drugs as well as in most patients who continued therapy, the agency said.

 

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