GLP-1 drugs have been around for nearly two decades. The first GLP-1 receptor agonist, exenatide, was approved by the FDA in 2005. But the story of GLP-1 itself goes back to the 1980s when scientists first discovered this natural hormone. Here is the full timeline.
What Are GLP-1 Drugs?
GLP-1 stands for glucagon-like peptide-1. It is a hormone your body makes naturally after you eat. It helps lower blood sugar and makes you feel full. GLP-1 drugs are lab-made versions that imitate this hormone. They are used to treat type 2 diabetes and, in some cases, obesity.
These drugs work by slowing digestion, increasing insulin release, and reducing appetite. They are given as injections. The most well-known today is semaglutide, sold as Ozempic for diabetes and Wegovy for weight loss.
When Was GLP-1 First Discovered?
Scientists first identified GLP-1 in the early 1980s. Researchers were studying the gut and its role in blood sugar control. They found that cells in the intestine release GLP-1 after a meal. This was a major step in understanding how the body regulates glucose.
By the mid-1980s, scientists had mapped out the hormone’s structure and its effects. They realized it could be a powerful tool for treating diabetes. But turning that discovery into a drug took more than 20 years.
How Long Have GLP-1s Been Around? A Quick Timeline
1980s: GLP-1 is discovered and its role in blood sugar control is identified.
1990s: Researchers work on making a synthetic version that lasts longer in the body. Natural GLP-1 breaks down within minutes.
2005: The first GLP-1 drug, exenatide (Byetta), is approved for type 2 diabetes. It comes from Gila monster saliva and requires two injections per day.
2010: Liraglutide (Victoza) is approved. It lasts longer because of a small chemical change. Patients inject it once daily.
2014: Liraglutide is approved for weight loss under the brand name Saxenda.
2017: Semaglutide (Ozempic) is approved for diabetes. It uses a once-weekly injection.
2021: Semaglutide (Wegovy) is approved for chronic weight management.
2023–2024: Oral semaglutide (Rybelsus) is available. Newer drugs like tirzepatide (Mounjaro, Zepbound) also appear, though these are dual GIP/GLP-1 receptor agonists.
The First GLP-1 Drug: Exenatide (2005)
Exenatide was a breakthrough, but it was not perfect. It came from the saliva of the Gila monster, a lizard. That natural compound, exendin-4, is similar to human GLP-1 but resists breakdown longer. Still, patients needed two shots a day.
Many people found that inconvenient. Nausea was also a common side effect. But exenatide proved the concept: a GLP-1 drug could lower blood sugar and help with weight loss. It opened the door for better versions.
Liraglutide and the Next Generation (2010)
Liraglutide was the first GLP-1 drug made entirely in a lab. Scientists added a fatty acid chain to the GLP-1 molecule. This allowed it to bind to albumin in the blood, slowing its breakdown. One injection per day was enough.
Liraglutide became popular for diabetes. In 2014, a higher dose was approved for weight loss as Saxenda. This was the first time a GLP-1 drug was officially cleared for obesity, not just diabetes. It showed that GLP-1 drugs could work for people without diabetes who needed to lose weight.
Semaglutide: The Breakthrough (2017–2021)
Semaglutide improved on liraglutide by lasting even longer. A once-weekly injection became possible. Clinical trials showed it lowered blood sugar more effectively than older GLP-1 drugs and caused greater weight loss.
In 2021, the FDA approved semaglutide 2.4 mg for chronic weight management under the name Wegovy. The results were dramatic: average weight loss of 15% of body weight in trials. This sparked the current surge in popularity. The drug went viral on social media, leading to shortages.
How Has the Timeline Shaped Today’s Treatments?
The timeline matters because it explains why GLP-1 drugs are so widely used now. Early versions required frequent injections and caused more nausea. Each generation improved convenience and effectiveness. Once-weekly dosing made them easier to stick with.
Today, doctors have multiple options. Exenatide is still available but rarely prescribed first. Liraglutide is used for both diabetes and weight loss. Semaglutide is the most popular. Newer drugs like tirzepatide (Mounjaro, Zepbound) target both GLP-1 and GIP receptors and show even more weight loss. Research continues on oral versions and longer-acting injectables.
Common Misconceptions About GLP-1 Drugs
Some people think GLP-1 drugs are new. They are not. As the timeline shows, the first one came out nearly 20 years ago. Others believe they are a quick fix. They are effective for weight loss, but they require continued use. Stopping often leads to regaining weight.
Another myth is that GLP-1 drugs are dangerous because they are new. The oldest ones have been studied for almost two decades. Long-term safety data exist for exenatide and liraglutide. Semaglutide has been studied in large trials lasting several years. That does not mean they are risk-free, but they are not experimental.
What Does the Future Look Like?
Drug companies are working on pills that work like injections. Oral semaglutide (Rybelsus) is already approved for diabetes. Higher doses for weight loss are in trials. Other companies are developing drugs that combine GLP-1 with other gut hormones, like GIP and glucagon.
Some researchers are exploring whether GLP-1 drugs can help with conditions beyond diabetes and obesity. Early studies look at heart disease, fatty liver, addiction, and even Alzheimer’s. The evidence is still emerging. But the timeline shows that GLP-1 drugs have already changed medicine in a short time.
Frequently Asked Questions
How long have GLP-1 drugs been on the market?
GLP-1 drugs have been on the market since 2005, when the FDA approved exenatide (Byetta). That is nearly 20 years as of 2025.
When was GLP-1 first discovered?
GLP-1 was first identified in the early 1980s by researchers studying gut hormones. The discovery laid the groundwork for developing synthetic versions.
How long does it take for GLP-1 drugs to work?
For blood sugar control, effects can be seen within weeks. For weight loss, significant results typically appear after 3–6 months of consistent use.
Are GLP-1 drugs safe for long-term use?
Yes, for approved uses. Exenatide and liraglutide have safety data spanning over a decade. Semaglutide has several years of trial data. However, like all medicines, they have risks and side effects that should be discussed with a doctor.
