Short answer: no. Longer answer: your body adapts to weight loss, not to the drug.
Tachyphylaxis (drug tolerance) isn't seen
Studies extending beyond 4 years show that patients who stay on a steady GLP-1 dose maintain their weight loss. The receptors don't downregulate the way they would with some other classes of drug.
What does change
Your daily calorie need drops as you lose weight. That natural adjustment is what creates the plateau effect — not weakening of the medication.
Long-term safety
Cardiovascular safety has been demonstrated through 5+ year trials. Long-term real-world data continues to accumulate; no clinically significant late-emerging concerns to date.
