What happens when you stop taking a GLP-1 medication?
Most of the lost weight tends to return. In the STEP 1 trial extension, participants regained about two-thirds of their lost weight within a year of stopping semaglutide, as appetite and cravings come back. This is why clinicians treat obesity as a chronic condition and GLP-1s are generally used long-term.
What are the most common side effects of GLP-1 drugs?
The most common side effects are gastrointestinal: nausea, diarrhea, vomiting, and constipation. They are usually mild to moderate and worst while the dose is being increased, so doses are raised slowly to improve tolerability. Rare but serious risks exist, so these drugs are taken under medical supervision.
Do GLP-1 medications cause muscle loss?
Some muscle (lean mass) is lost along with fat. Studies suggest roughly 25 to 40 percent of total weight lost can come from lean mass, though some of that is fluid. This is not unique to GLP-1s; any major weight loss does it. Adequate protein and resistance exercise help preserve muscle.
Who should not take GLP-1 medications?
According to the FDA labels, semaglutide and tirzepatide are contraindicated for people with a personal or family history of medullary thyroid carcinoma (MTC) or MEN2 syndrome, and for anyone with a serious allergy to the drug. They are also not recommended in pregnancy. Always confirm suitability with a clinician.
Are GLP-1 medications safe during pregnancy?
No. GLP-1 medicines are not recommended during pregnancy or breastfeeding, and their safety for a developing baby has not been established. Because semaglutide stays in the body for weeks, guidance is to stop it well before trying to conceive. Discuss timing with your doctor.