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Addyi, marketed by , was initially expected to become a blockbuster drug, filling an important niche in women's health. But the drug came with unpleasant side effects including dizziness and nausea, and it carries a safety warning about the dangers of combining it with alcohol.

The boxed warning cautions that drinking while consuming the pill can cause dangerously low blood pressure and fainting. If patients have several drinks, the label recommends waiting a few hours before taking the drug, or skipping one dose.

Sales of Addyi, which acts on brain chemicals that affect mood and appetite, fell short of Wall Street's initial expectations. In 2019, the FDA approved a second drug for low female libido, an on-demand injection that acts on a different set of neurological chemicals.

Sprout CEO Cindy Eckert said in a statement the approval “reflects a decade of persistent work with the FDA to fundamentally change how women’s sexual health is understood and prioritized.” The company, based in Raleigh, North Carolina, announced the FDA update in a press release Monday.

The medical condition for a troublingly low sexual appetite, called hypoactive sexual desire disorder, has been recognized since the 1990s and is thought to affect a significant portion of American women, according to surveys. After the blockbuster success of Viagra for men in the 1990s, drugmakers began pouring money into research and potential therapies for sexual dysfunction in women.

But diagnosing the condition is complicated because of how many factors can affect libido, especially after menopause, when falling hormone levels trigger a number of biological changes and medical symptoms. Doctors are supposed to rule out a number of other issues, including relationship problems, medical conditions, depression and other mental disorders, before prescribing medication.

The diagnosis is not universally accepted, and some psychologists argue that low sex drive should not be considered a medical problem.

The FDA rejected Addyi twice prior to its 2015 approval, citing the drug's modest effectiveness and worrisome side effects. The approval came after a lobbying campaign by the company and its supporters, Even the Score, which framed the lack of options for female libido as a women's rights issue.

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This story has been updated to correct the age range of the FDA approval update. The agency approved the drug for postmenopausal women up to age 65, not older than 65.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.