What happened
Endocrinologists at NewYork-Presbyterian and Weill Cornell Medicine took a fresh look at the large SURMOUNT trial of tirzepatide (the drug in Mounjaro and Zepbound) and split the results by where women were in their reproductive life: before menopause, in perimenopause, and after.
The finding is the reassuring one: tirzepatide worked about equally well across all three stages, producing roughly 20% body-weight loss along with meaningful reductions in waist size, regardless of menopausal stage. A separate strand of research has gone further, suggesting that menopausal hormone therapy may modestly add to the weight loss for women who are on it.
Why this was an open question
It mattered because there had been genuine doubt. Menopause changes the body's chemistry. As oestrogen falls, weight tends to settle around the middle, muscle is lost faster, and many women find the strategies that worked at 35 simply stop working at 50. It was a fair question whether a GLP-1 could still do its job against that hormonal headwind.
This analysis says yes. The drug does not lose its power in midlife. For the many women who reach for one precisely because menopause changed everything, that is real, evidence-based reassurance.
The asterisk worth keeping
One thing does change in midlife, and it is not the drug's effectiveness. It is the stakes around muscle and bone.
From the early forties, falling oestrogen already speeds the natural loss of muscle and bone. A GLP-1's weight loss, layered on top, is a second subtraction. So while the weight result is just as good in menopause, the muscle and bone protection matters more, not less. The reassurance is real, and so is the homework. (See GLP-1s in perimenopause.)
What it means for you
If you are in or near menopause and have wondered whether one of these drugs is worth it, this is a strong, evidence-based yes, with a clear condition: protect what you have while you lose. That means enough protein and some resistance training, the two things that turn "weight lost" into "fat lost" rather than muscle and bone lost.
It is also worth raising hormone therapy with your doctor if you have not, both for menopause symptoms in their own right and, possibly, for a small added effect here.
What to do with this
If the medication works differently through menopause, the protein floor matters more rather than less. The calculator sets it from adjusted body weight and reads your cycle phase where you have one.