Does Wegovy^® Affect Your Period? What the Science Says

Does Wegovy^® affect your period? The short answer is that we don’t have much data yet on Wegovy^® (semaglutide) and menstrual changes. Irregular periods aren’t listed as a known side effect on the drug’s prescribing label, and there’s very little research focused specifically on this topic.

Still, some people might notice fluctuations in their cycle after starting Wegovy^® or similar weight loss medications. On the other hand, some early findings — especially in patients with polycystic ovary syndrome (PCOS) or obesity — suggest that semaglutide, the active ingredient in Wegovy^®, might help regulate periods. In one small study, around 80 percent of participants noticed more regular cycles.

The other thing is that significant weight loss (which Wegovy^® promotes) can temporarily throw off your period. In a 68-week clinical trial, participants lost up to 20 percent of their body weight. When your body undergoes a major change like that, your hormones (and, by extension, your cycle) can shift.

So what’s actually going on? We’ll break down what the science says about semaglutide, weight loss, and your cycle.

How does Wegovy^® affect your period — or the weight loss resulting from this medication? Here’s how losing weight with GLP-1 (glucagon-like peptide-1 receptor agonist) drugs like Wegovy^® might affect the menstrual cycle.

Cycle Regularity 

Weight loss can do a lot of good for your overall health, but when it comes to your period, the effects aren’t always straightforward.

Research suggests that changes in weight — whether it’s gaining or losing — can disrupt your cycle. That’s especially true for people with obesity or abdominal obesity (which is belly-centered) because shifts in body fat (including rapid weight loss) can influence hormone levels.

Indeed, the more weight you lose, the more likely you are to experience menstrual irregularities — at least for a while.

Amenorrhea

Significant weight loss — usually around 10 percent or more of your body weight — can sometimes cause your period to disappear entirely. This is called amenorrhea. Though it sounds dramatic, it’s not uncommon when your body’s going through big changes.

Since Wegovy^® can lead to major weight loss, it might indirectly trigger irregular periods or even make them stop for a while.

But here’s the flip side: Some people actually find their cycles become more regular on Wegovy^®. Again, it’s not so much the medication itself but the weight loss it can help achieve.

Why? Well, research shows that women with obesity are more than twice as likely to have irregular periods compared to those within the healthy BMI (body mass index range). So, losing weight can help bring things back into balance, at least hormonally speaking.

Take Larissa, 32, for example: “I have never since I started puberty had regular cycles, [but] I have had a period every month since starting Zepbound^®,“ she shares. (Zepbound, which works similarly to Wegovy^® and belongs to the same drug class known as GLP-1 receptor agonists.) “My periods are on time, not heavy, no longer painful, and mostly normal.”

PCOS

One small 2023 study looked at how semaglutide affects people with PCOS and obesity. Over three months, 27 women took a weekly 0.5-milligram (mg) dose of semaglutide. Nearly 80 percent lost at least five percent of their body weight and saw their cycles return to a more regular rhythm.

It’s not just Wegovy^®. Other GLP-1s like Ozempic^® have also shown promise for helping regulate periods in those with PCOS.

In other words, if your cycle has been irregular due to this medical condition, GLP-1 meds like Wegovy^® might help get things back on track.

That was the case for Liz, 25, who has insulin resistance and PCOS. When she started taking semaglutide, things got better. “I lost weight, it regulated my cycle and was bringing me back to a healthy weight so I could get pregnant,“ she explains.

Check out our full guide to Wegovy^® and PCOS to learn more.

Period Flow

Does Wegovy^® affect your period in terms of flow? Some women have shared that their periods became heavier after starting GLP-1 medications like Wegovy^®. But for now, that’s anecdotal. Heavier flow hasn’t shown up as an official side effect in clinical trials.

As with cycle timing, your flow can go either way. Some might notice heavier bleeding, while others may find their periods get lighter, and some don’t notice any changes at all.

One possible reason for lighter periods? Research shows that carrying excess weight is linked to heavier periods. So if you’re losing weight on Wegovy^®, your flow might actually become lighter and easier to manage.

All that said, there haven’t been any formal studies on how Wegovy^® affects menstrual flow.

Premenstrual Syndrome (PMS)

PMS can show up as:

• Fatigue

• Irritability

• Mood swings

• Cramps

• Breast tenderness

These symptoms typically hit in the days leading up to your period and can vary in severity.

So far, there’s no solid evidence that Wegovy^® affects PMS symptoms.

Although Wegovy^® itself hasn’t been linked to changes in PMS, research does show that people with a higher BMI may be more likely to experience PMS. So, in theory, weight loss from Wegovy^® could help ease those symptoms — but, again, there’s no clinical data (yet) to confirm that.

Spotting

There’s no evidence linking Wegovy^® to spotting. Still, bodies are complex, so we can’t rule it out completely.

If you’re noticing small amounts of blood throughout the month, it’s worth checking in with a healthcare provider and asking about other potential causes, including:

• Stress

• Shifts in hormone levels

• Inflammation

• Infections

• An underactive thyroid

Your provider can go over your symptoms and help you figure out what’s going on.

Fertility

Let’s talk about ovulation. Could Wegovy^® improve your chances of getting pregnant? Maybe — but the credit likely goes to weight loss, not the medication itself.

Research shows that obesity can affect fertility, so reaching a healthier weight with the help of Wegovy^® may support reproductive health.

It’s particularly relevant for women with PCOS, who often face challenges with getting pregnant. In theory, since semaglutide may help regulate cycles by promoting weight loss, that could also mean more consistent ovulation — and possibly better odds of conceiving.

It’s important to note that Wegovy^® isn’t typically recommended during pregnancy. If you’re currently pregnant or thinking about trying soon, talk to your healthcare provider. They’ll help you figure out the right next step.

There’s no solid evidence that Wegovy^® directly causes missed periods. It’s not a listed side effect, and so far, clinical trials haven’t flagged it as an issue.

But, as mentioned, Wegovy^® can lead to significant weight loss, which itself can throw off your cycle.

When all’s said and done, if your period hasn’t come in a while, don’t forget to consider other causes — like pregnancy — and talk to a healthcare professional if you’re unsure what’s going on.

There’s no research showing that Wegovy^® directly impacts sex hormones, like progesterone or estrogen levels. And hormonal changes haven’t been flagged in clinical trials. So if your cycle feels a little off, it’s unlikely the medication itself is changing your hormonal balance.

But weight loss can influence reproductive hormones. What’s more, GLP-1s target other hormones, like insulin and glucagon, which help regulate appetite and blood sugar levels. These ripple effects might lead to changes in how your body feels and functions.

So far, there’s no clear evidence that Wegovy^® directly causes changes to menstruation. Here’s a quick recap:

• More research is needed. Without studies focused on semaglutide and menstrual health, we can’t say definitively how these drugs affect periods.

• Weight loss is the key factor. If your cycle feels off — whether it’s irregular periods, lighter flow, or missing periods — it’s likely tied to the weight loss that often comes with these meds, not the medication itself.

• Periods might even improve on Wegovy^®. Obesity is linked to heavier, more painful periods and PMS. So, losing weight — whether through Wegovy^®, Ozempic, or other methods — might help regulate your cycle and ease symptoms over time, especially when paired with healthy lifestyle changes like nutritious eating and daily movement.

• Talk to your healthcare provider. Any changes in your period can feel unsettling. Don’t hesitate to check in with your provider to understand what’s going on and whether it needs medical attention.

Hers offers access to a range of weight loss treatments, including injections and oral medications like metformin or topiramate. As part of your treatment plan, you’ll get a holistic, doctor-backed weight loss program and 24/7 access to licensed providers to have any questions answered.

If you’re hoping to start your weight loss journey, take our free online assessment to learn more about weight loss medication and treatment options.

Ozempic^® and Wegovy^® are registered trademarks of Novo Nordisk A/S. Hims, Inc. is not affiliated with or endorsed by Novo Nordisk A/S.