The federal government is phasing out off-brand copies of two blockbuster drugs used to treat obesity and diabetes

"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.

The FDA says people may be subject to dosing errors.

The company is working on developing a once-a-day pill called danuglipron to treat obesity.

Pfizer announced that it has selected its preferred once-daily modified release formulation of danuglipron, a move that is significant in the obesity drug’s development.

Both medications are FDA-approved for people with Type 2 diabetes.

"GMA" looks at what to do after you reach your goal when taking medication for weight loss such as Ozempic or Wegovy.

GLP-1 medications such as Ozempic may help lower the risk of certain cancers.

ABC News’ Dr. Darien Sutton breaks down a new study which shows GLP1 weight loss medications could potentially cut the risks of certain cancers.

ABC News’ medical correspondent Dr. Darien Sutton reports on the new study that suggest weight loss drugs like Ozempic and Wegovy may help lower risk of certain cancers.

ABC News chief medical correspondent Dr. Jen Ashton talks about how drugs commonly used for weight loss could help those suffering from sleep apnea.

Prescriptions for GLP-1 weight loss medications for young people rose from 8,000 to more than 60,000 between 2020 and 2023.

ABC News’ medical correspondent Dr. Darien Sutton reports on the latest health headlines involving popular drugs used for weight loss.

In an open letter, Eli Lilly and Company, the maker of Mounjaro and Zepbound, says it's concerned about the dangers of fake and compounded versions of the popular drugs being sold online.

The drug maker behind some of the most popular drugs used for diabetes and obesity has issued an urgent warning about fake and compounded versions of its Mounjaro and Zepbound medications.

The Wall Street Journal reported shrinking waistlines may be fueling the hunt for smaller clothing sizes and impacting the fashion industry.

Heart disease is the leading cause of death in the U.S., and a big study looks at how they can impact those with cardiovascular issues and who may be overweight.