Most Studies Show Sexual Benefits but Dysfunctions Possible
GLP-1 weight-loss drugs can improve sexual function in many people, especially those with diabetes. But a growing body of research shows the drugs may also cause sexual problems for some users, including erectile dysfunction, loss of libido, and weaker orgasms.
First approved in 2021, the new weight-loss drugs — known as GLP-1 receptor agonists — include semaglutide (sold as Wegovy and Ozempic). They suppress appetite so effectively that roughly 12 percent of American adults now take them, according to 2026 estimates. Many people lose 20 to 40 pounds or more and describe the drugs as life-changing.
Improved sexual function makes biological sense, particularly for diabetics.
The disease damages the arteries that carry blood to the genitals, often causing ED. These drugs normalize blood flow.
When blood circulates more freely, erections improve.
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Weight loss also reduces fatigue, leaving more energy for sex.
But sexual benefits aren’t universal.
Package inserts for the drugs mention possible sexual side effects, likely identified during the approval process. Research into these effects is still in its early stages, and so far only a small fraction of patients report problems. Still, patients and clinicians should understand the risks.
Libido loss and weaker orgasms
Weight loss from these drugs often boosts sexual desire. People feel more energetic, look better, and hear it from others. Many individuals report more interest in sex. But scattered reports also describe libido loss.
Weaker orgasms have also been reported. Weight reduction from these drugs involves losing fat, but some muscle mass as well — including pelvic floor muscles. These contract during orgasm, providing pleasure. If they reduce pelvic floor muscle mass, contractions may feel less powerful.
Hormonal shifts and physical changes
Sex hormones like estrogen and testosterone are synthesized from cholesterol.
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Losing body fat can lower cholesterol levels, which is usually good for heart health, but it may also alter hormone levels. Anyone taking these medications who notices sexual changes should ask their doctor to check sex hormone levels.
Vulvar skin changes are another reported issue. The labia majora, the outer vaginal lips, contain fat. When women use these drugs, that fat can shrink, causing the lips to sag or become less prominent. As the outer lips shrink, the inner lips may appear more prominent. Women have also reported labial discomfort, itching, and even ulcers.
Mixed impact on erections depends on diabetes status
For diabetic males, these drugs clearly improve erections.
But for obese non-diabetic males, the picture flips.
Scientists at Johns Hopkins and the University of Texas gave a GLP-1 to 3,094 obese middle-aged males without the condition. Compared with similar males who didn’t take the drug, those on the drug were "significantly more likely" to report ED. Why remains unclear, but the large sample makes the finding hard to dismiss.
Gastrointestinal distress and constipation
These drugs slow stomach emptying, which can create gut-related side effects. The phrase "gut feelings" hints at how the digestive system influences emotions. Slow emptying may show up as nausea or discomfort, and that can dampen libido and reduce the pleasure of sex.
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Constipation is another common issue.
These drugs also slow food passage through the lower digestive tract. Chronic constipation affects about 20 percent of American adults and can reduce sexual desire and satisfaction. People should include fruits, vegetables, and whole grains in meals, and aim for 30 to 60 minutes of exercise a day.
But because these drugs reduce muscle mass, staying active can become harder.
But emerging evidence suggests these drugs are not sexually benign.
These drugs can be lifesavers. They help control the condition and obesity, two major risk factors for heart disease and stroke. Patients and the professionals advising them should understand that these drugs may cause or worsen sexual problems, and that new findings continue to emerge.
