The FBI warns counterfeit versions of weight loss drugs drugs can cause significant health issues.

The FBI is warning about counterfeit weight loss drugs being sold that claim to have semaglutide, the key ingredient in Ozempic and Wegovy.

ABC News' Dr. Tara Narula shares what patients need to know.

ABC News chief medical correspondent Dr. Tara Narula breaks down what patients need to know.

President Donald Trump and HHS Secretary Robert F. Kennedy Jr. said they will be studying the "threat" to children posed by antidepressants and obesity medications.

"GMA" explores a New York Times report on the unexpected impact of weight loss medications on relationships.

Semaglutide, a medication widely used for diabetes and weight loss, may offer another unexpected benefit -- it could help people drink less alcohol.

The "Hims and Hers" commercial railed against the weight loss industry and promoted the company's weight loss drug offerings as a less costly option compared to brand-name drugs.

The actor shared he had lost 40 pounds since taking the medication.

ABC News chief medical correspondent Dr. Tara Narula explains the findings of a new study on GLP-1 drugs commonly used for weight loss.

The drugs' pricing will be negotiated directly between the government and drug manufacturers.

Just days before leaving the office, President Biden expanded the list of medications to be negotiated by Medicare, including Ozempic and Wegovy.

Dr. Alexandra Sowa, an obesity medicine specialist and author of the new book “The Ozempic Revolution” shares the pros and cons of using GLP-1 medications for weight loss.

ABC News’ medical correspondent Dr. Darien Sutton breaks down the latest medical headlines.

The weight loss drug is now also the first medication for patients with sleep apnea.

The FDA has expanded the approval of Eli Lilly’s obesity medication Zepbound to include treating moderate to severe obstructive sleep apnea for people with obesity.

"GMA" shares an exclusive look inside the lab of the maker of such drugs as Mounjaro and Zepbound to show what it's doing to warn users about the dangers of counterfeit drugs.

Experts say the growing use of weight loss drugs may be helping to reverse obesity trends. ABC News medical contributor Dr. John Brownstein breaks down the latest study.

Experts say the growing use of weight loss drugs may be helping to reverse obesity trends.

The new trend is seeing people take very small doses of medications like Ozempic, Wegovy and Zepbound.

A new study is suggesting that not all weight-loss drugs are created equal.

Study participants treated with Zepbound lost 20% of their body weight.

Eli Lilly says new research shows its medication Zepbound helped patients shed more weight over a shorter period of time than Novo Nordisk’s Wegovy.

The Biden administration has proposed a new rule to “significantly” expand coverage of anti-obesity medications for Americans with Medicare and Medicaid.

A new ABC News Investigation looks at weight loss drugs like Wegovy and Zepbound and how the high demand has contributed to nationwide shortages and alternatives.

A shortage in injections linked to weight loss opened the market not only to compounding pharmacies but also some questionable online businesses. How do you know if you're getting what's advertised?

ABC News’ Eva Pilgrim takes a deep dive into the safety and business of compounding weight loss drugs. 

Dr. Darien Sutton and Dr. Stephanie Widmer discuss new studies, which found GLP-1 weight loss drugs beneficial in fighting Type 2 diabetes and certain addiction disorders.

All doses of the weight loss drugs are listed as "available" by the FDA.

Semaglutide, the active ingredient found in Ozempic and Wegovy, may reduce the risk of Alzheimer’s disease, a new study published Thursday morning finds.

Some women have found the medications help with weight loss during menopause.

As more women speak openly about menopause and the changes it brings, some doctors say GLP-1 medications like Ozempic and Wegovy can be helpful in curbing menopausal weight gain.

The landmark research found those taking Ozempic had a 40% lower chance of experiencing an opioid overdose and the risk of alcohol intoxication was cut in half compared to those not taking the drug.

A study suggests that weight loss medications like Ozempic may help reduce the risk of overdose and alcohol intoxication in people with substance use disorders.

Senator Bernie Sanders (D-VT) pushes for change in Washington as CEO of Novo Nordisk, maker of Ozempic and Wegovy, is under scrutiny for their high cost in the U.S.

Leah Hope said she kept her focus on being able to live a "big life."

Semaglutide drugs, like Ozempic and Wegovy, may help reduce the risk of an opioid overdose, according to a new study published in JAMA. Dr. Darien Sutton explains.

Senators questioned Novo Nordisk CEO Lars Jørgensen on Tuesday at a hearing over the costs of Ozempic, Wegovy and similar weight loss drugs, which are cheaper in other countries.

And, President Joe Biden delivers farewell address to the United Nations.

Senators grilled Novo Nordisk CEO Lars Jørgensen Tuesday over the costs of Ozempic and similar weight loss drugs.

Senators grilled Novo Nordisk CEO Lars Jørgensen Tuesday over the costs of Ozempic and similar weight loss drugs.

The CEO of drugmaker Novo Nordisk, which makes Ozempic and Wegovy, is set to testify at a hearing about the high cost of the drugs in the United States compared to other countries.

The pill is made by Novo Nordisk, the same company that makes Ozempic.

Dr. Leah Croll, a board-certified neurologist, helps break down a new weight loss medication presented by researchers in Spain that shows significant potential for weight loss that comes in pill form.

A new study finds the drug semaglutide appears to lower the risk of death from COVID in some patients. ABC News' Erielle Reshef reports.

David Ricks, the CEO of Eli Lilly, announced the weight-loss drug can be purchased directly without insurance coverage.

Researchers now say that the popular weight loss drug can substantially lower a person's risk of heart-related issues.

Eli Lilly says a new trial showed the key ingredient in its popular drugs Zepbound and Mounjaro helped slash the chance of developing type 2 diabetes by 94% among patients at high risk.

Bloomberg health reporter Madison Muller and Dr. Nate Wood break down the latest on how Ozempic and other weight loss drugs are transforming America.

The urgent alert from the Food and Drug Administration comes as more people turn to unauthorized versions of popular weight loss drugs.