The Food and Drug Administration approved Kybella for adults with moderate or severe fat below the chin.

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NEW YORK — The Food and Drug Administration (FDA) said Wednesday it approved an injection designed to melt away double-chin fat.

The agency approved a drug, brand name Kybella, for adults with moderate or severe fat below the chin, or submental fat. It’s the first approved drug for Kythera Biopharmaceuticals.

The drug is a synthetic form of deoxycholic acid, a chemical the FDA said is naturally produced by the body and helps it absorb fats. It destroys fat cells by breaking down the cell membrane. The agency warned that Kybella can also kill skin cells if inadvertently injected into the skin.

The agency says patients can get up to 50 injections in one sitting, but treatments should be at least one month apart and patients should get no more than six treatments.

Currently, people looking to part with their double chins must have fat removed through more invasive means, such as liposuction or a neck or face-lift.

Kythera plans to start selling Kybella in the second half of 2015, and said in regulatory filings that it thinks the injection could top $500 million in annual sales. It said it is too soon to estimate what a treatment would cost. The treatment would not be covered by insurance.

The Westlake, Calif., company said deoxycholic acid is a safe ingredient found in several other approved drugs. It has also filed for marketing approval in Australia, Canada and Switzerland and wants to market the drug in other countries.

Citing market research and surveys by dermatologists, Kythera says U.S. consumers spend more than $1 billion a year on cosmetic facial injections such as the anti-wrinkle treatment Botox and dermal fillers, and that number is expected to keep growing. Many patients who undergo those treatments would also be willing to have a Kybella injection to eliminate fat under their chins, the company said in filings with the Securities and Exchange Commission (SEC).

The Washington Post, citing a survey last year by the American Society for Dermatologic Surgery, reported that nearly 70 percent of respondents listed “excess fat under the chin/neck” as a key concern about their appearance.

Kybella isn’t approved for injection into any other part of the body. “It is important to remember that Kybella is only approved for the treatment of fat occurring below the chin, and it is not known if Kybella is safe or effective for treatment outside of this area,” Amy Egan, deputy director of the Office of Drug Evaluation III at the FDA, said in a statement.

The FDA said the most common side effects of the drug included swelling, bruising, pain, numbness, redness and hardness in the treatment area, while more serious side effects included trouble swallowing and nerve injury that can cause an uneven smile or muscle weakness.

Shares of Kythera Biopharmaceuticals fell $2.05, or 4.3 percent, to $45.59 Wednesday.

An FDA advisory panel recommended approving Kybella on March 9. The company’s stock has climbed 15 percent since March 4, a few days before the panel vote.