Can Zepbound affect your period?

In this article:

• Can Zepbound affect your period?
• Why might Zepbound affect your cycle?
• What the research says
• Common menstrual changes
• Other factors affecting your period
• When to see a doctor
• The bottom line

In this article

• Can Zepbound affect your period?
• Why might Zepbound affect your cycle?
• What the research says
• Common menstrual changes
• Other factors affecting your period
• When to see a doctor
• The bottom line

About 1 in 8 people in the United States now take a glucagon-like peptide-1, or GLP-1, medication for weight loss, diabetes, or another condition, according to a KFF poll. One of the newer options, Zepbound (tirzepatide), is a once-weekly injectable approved by the Food and Drug Administration for chronic weight management. It works by activating both GLP-1 and glucose-dependent insulinotropic polypeptide, or GIP, receptors to curb cravings, reduce appetite, and slow stomach emptying. It’s also FDA-approved for moderate to severe obstructive sleep apnea in adults with obesity. 

As use grows, some people are noticing an unexpected change: their menstrual cycles. Zepbound can affect menstruation in different ways—sometimes improving symptoms, other times causing disruptions—depending on a person’s health history and other factors.

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Can Zepbound mess with your period?

“Zepbound (tirzepatide) does not directly affect the menstrual cycle, but it can influence it indirectly,” explains Erika Gray, Pharm.D., founder and chief medical officer at ToolBox Genomics. 

Because Zepbound may help you shed pounds, Dr. Gray notes that the drug’s effect on your cycle could be due to weight loss, hormonal shifts, and improved insulin sensitivity.

“Some individuals on Zepbound have reported unpredictable cycles, irregular bleeding, and changes to their flow. In contrast, those with PCOS or underlying conditions have seen improved cycle regularity,” Dr. Gray says. 

Why might Zepbound affect your cycle? 

If you’re taking Zepbound (tirzepatide), Ozempic (semaglutide), or any other GLP-1/GIP medication for weight loss, you may notice a change in your menstrual cycle due to several reasons. 

Hormonal changes

Hormones, like estrogen, that are important in regulating the menstrual cycle are stored in fat tissue. When you lose fat, which patients often do on Zepbound, your hormonal levels may change, thus potentially disrupting the menstrual cycle. 

On the flip side, many people with obesity may already have an abnormal menstrual cycle, and taking Zepbound could potentially help restore a more regular period.

“As a patient’s body mass index (BMI) and the volume of fat tissue increase, the level of excessive circulating estrogen also increases,” explains Eric C. Liberman, DO, director of minimally invasive gynecologic surgery at Holy Name Medical Center in New Jersey. “These elevated estrogen levels trick your body into thinking you are pregnant and therefore prevent ovulation, and could lead to irregular menstrual cycles or even the complete absence of periods.”

Patients on Zepbound who lose fat may also lose excessive estrogen, potentially helping them return to a more normal cycle.  

Rapid weight loss and inadequate nutrition

Proper nutrition and caloric intake are vital to maintain a healthy menstrual cycle. A study of more than 500 menstruating adults found that those with irregular periods had lower consumption of protein, sodium, vitamin B3, vitamin B5, and vitamin K. 

Zepbound acts as an appetite suppressant, which could lead to nutrient deficiencies. “Some individuals lose too much body weight or do not eat adequate nutrition or protein while on a GLP-1, which can cause irregular cycles or missed periods,” Dr. Gray says. 

Reduced inflammation

Obesity is strongly linked to inflammation, and chronic inflammation is linked to longer menstrual cycles and follicular phases. Taking a GLP-1 medication like Zepbound may reduce inflammation, which could help regulate your cycle. 

Delayed gastric emptying

For people on medications such as hormonal birth control, Zepbound’s effects on digestion may be significant. Because it’s a GLP-1 and GIP receptor agonist, the drug allows food to remain in your stomach for longer than it otherwise would. 

This can mean you feel fuller longer, but it could affect the absorption of medications like oral contraceptives. This can lead to breakthrough bleeding and spotting.

What studies say about Zepbound and menstrual cycles

Unfortunately, studies on tirzepatide and menstruation are few and far between. Much of what is known about Zepbound and the menstrual cycle appears to be anecdotal rather than deeply researched. 

“We do not yet fully understand or are aware of (the drug’s) systemic effects,” says Dr. Liberman. “For example, the ovaries and endometrium, which is the lining of the uterus, contain GLP-1 receptors that may directly play a role in affecting menses. These medications likely activate these receptors and may affect the menstrual cycle in ways not yet understood.”

This represents an emerging area of research; these mechanisms have not yet been confirmed in clinical studies. In a survey of 1,754 users of the birth control app Natural Cycles, 27% reported that after starting a GLP-1, their menstrual cycle changed. This is a self-reported survey, not a clinical trial.

When it comes to science-supported data, there are just a few areas where researchers have made progress. For example, one study of more than 800 women with PCOS demonstrated that taking GLP-1s can improve menstrual cyclicity, reproductive health, and pregnancy rate. This reflects the medication’s ability to restore a more normal cycle. 

Conversely, in a review of six clinical trials, researchers found that tirzepatide has a bigger impact on the absorption of oral contraceptives compared to other GLP-1s. If a drug like Zepbound or Mounjaro (which also contains the active ingredient tirzepatide, but is used for Type 2 diabetes) disrupts birth control use, it could have a significant impact on your period.

Common menstrual changes reported with Zepbound use

People on Zepbound, Wegovy, or other GLP-1/GIP medications report several notable side effects specifically related to menstruation. While many of these may only be temporary, they are still worth noting before you start the drug. It should also be noted that there isn’t yet strong clinical evidence that Zepbound directly causes these changes; rather, they have been reported in some users and may be influenced by indirect factors, such as weight loss.

Missed periods

You have a neuroendocrine system, the hypothalamic-pituitary-gonadal axis (HPG axis), which regulates reproduction. GLP-1/GIP drugs may contribute to rapid weight loss, which signals low energy availability to the brain. This can indirectly disrupt your HPG axis. When this happens, your body produces less luteinizing and follicle-stimulating hormones, which can lead to anovulation (no egg is released) and skipped periods.

Irregular cycle lengths

If you lose body fat rapidly, your estrogen levels fluctuate. This can make ovulation less predictable, resulting in longer or shorter cycles. 

Similarly, because Zepbound reduces appetite, your body may interpret a lower caloric intake as a lower-energy state. This can affect how your brain signals reproductive hormones, resulting in delayed ovulation. 

Changes in flow

When ovulation is either inconsistent, delayed, or skipped, your progesterone levels can fluctuate. This can cause heavier-than-normal bleeding in some people. 

Breakthrough bleeding

Breakthrough bleeding, or spotting between periods, may happen if you’re taking Zepbound, Saxenda, or another GLP-1. This is because fluctuating ovulation can affect progesterone levels, leading to small areas of your uterine lining shedding before they should. 

Easing PMS symptoms

There is a correlation between BMI and PMS symptoms like bloating and cramping. Good news: One way weight loss medications may indirectly affect your cycle is that as the number on the scale drops, you may see improvement in PMS symptoms.

Distinguishing Zepbound effects from other factors

If you’re having issues with your menstrual cycle, it could be the medication, or it could be something else. The following factors can play a role in disrupting your period:

• Pre-existing health conditions: People with PCOS, thyroid issues, pelvic inflammatory disease, and many other conditions are prone to irregular periods.
• Age: People in perimenopause may experience changes in their periods, while menopause is when menstruation has stopped for 12 consecutive months.
• Stress: People with high stress levels may experience shorter, lighter periods, or even miss periods completely.
• Intense exercise: Sudden increases in exercise or prolonged, intense exercise can affect cycles. 
• Poor sleep: Poor quality of sleep affects your hormones, which could disrupt an otherwise healthy menstrual cycle.
• Medications and supplements: Numerous products can affect cycles, including antidepressants, contraceptives, antipsychotics, and steroids.

Giving your healthcare provider a holistic view of your lifestyle, diet, and conditions may help narrow down whether the changes in your cycle are due to a GLP-1 or something else. 

When to talk to your healthcare provider

Hormonal fluctuations and changes in your cycle are normal and often nothing to be concerned about. However, Dr. Gray urges people to consult with a healthcare professional for medical advice if the following occurs:

• You have not had a period in 3 months or longer
• You experience heavy bleeding lasting longer than 7 days
• You have had unpredictable periods for several months
• You experience severe pain, cramping, dizziness, or fatigue
• Your period does not regulate after a few months of taking your GLP-1/GIP medication

The bottom line

Zepbound and other weight loss medications may have an effect on your period. It could indirectly affect the length of your cycle, blood flow, and whether you even get a period. Some people, specifically those with PCOS, actually see improvements to their periods.

It’s important to know how your period could be affected and weigh that against the potential benefits of taking Zepbound. Discuss any side effects you experience with your healthcare provider to determine whether the benefits outweigh the risks.