Home › Guide · Updated October 21, 2026

GLP-1 Medicines: Side Effects, Muscle, Heart and Pills

This brief gathers what we have published on how GLP-1 medicines affect the body beyond the scale: the side effects listed on their labels, what happens to lean muscle, the cardiovascular outcome trials, and the GLP-1 options taken by mouth.

Start here

• GLP-1 Side Effects: What Is Common, What Is Serious
  Nausea is common and usually fades. Here is the full list from the label, and the warning signs that are not. Updated October 9, 2026

Beyond the scale

• Which GLP-1 Is Best for Cardiovascular Benefit?
  Semaglutide, liraglutide and tirzepatide each have an outcome trial. What they enrolled, what they found and what the labels say. Updated October 21, 2026
• Is There an Oral GLP-1?
  Three approved GLP-1 pills, how each is taken, what the trials found and the label warnings, sourced to the labels and the studies. Updated October 13, 2026
• Does a GLP-1 Cause Muscle Loss?
  Lean mass falls with weight loss. The trial numbers, what lean mass actually means, and what the research says about protecting muscle. Updated October 12, 2026

Every article in this guide is written by the The Health Brief editorial team and cites its sources, mostly FDA labels, peer-reviewed studies and professional guidelines. How we work.