GLP-1 Medications, Birth Control & Fertility: What You Need to Know

By Giana Jarrah | Biomedical Engineer & Co-Founder of With Meraki Co.

Unless you've been completely offline, you've probably heard about GLP-1 medications.

Ozempic. Wegovy. Zepbound. Mounjaro.

These medications have become a HUGE topic of conversation, especially when it comes to weight management and metabolic health.

But there's another conversation happening that I think deserves a lot more attention:

How do these medications affect reproductive health?

You may have seen people talking about "Ozempic babies," unexpected pregnancies, changes in menstrual cycles, or whether their birth control still works while taking these medications.

And as a biomedical engineer and women's health educator, I think it's important that we separate what the science actually tells us from what's circulating on social media.

Let's get into it.

First, What Are GLP-1 Medications?

GLP-1 stands for glucagon-like peptide-1.

It's a hormone involved in regulating blood sugar, appetite, and digestion.

Medications that activate GLP-1 receptors can help regulate blood glucose, increase feelings of fullness, and slow gastric emptying.

Some are prescribed for type 2 diabetes, while others are approved for chronic weight management or additional indications.

Examples include:

• Semaglutide: Found in medications such as Ozempic and Wegovy.

• Tirzepatide: Found in Mounjaro and Zepbound. Tirzepatide acts on both GIP and GLP-1 receptors.

Although these medications are often discussed together, they aren't identical.

And those differences matter, especially when we're talking about contraception.

What's the Deal With "Ozempic Babies"?

You've probably seen the headlines.

Someone starts a GLP-1 medication, loses weight, and unexpectedly becomes pregnant.

Cue the viral story about an "Ozempic baby."

But does that mean these medications directly increase fertility?

Not necessarily.

Here's what we know.

Body weight, insulin resistance, and metabolic health can influence reproductive hormone signaling and ovulation.

For some people, particularly those with conditions such as polycystic ovary syndrome (PCOS), improvements in metabolic health and weight may be associated with more regular ovulation.

And if someone begins ovulating more consistently, their likelihood of becoming pregnant may change.

But that doesn't mean GLP-1 medications are fertility treatments.

It also doesn't mean everyone taking them will experience changes in ovulation.

Research into their reproductive effects is ongoing, and many of the claims circulating online go beyond what clinical studies have established.

So when someone says, "Ozempic made me fertile," I want us to recognize that there may be several factors involved.

Can GLP-1 Medications Interfere With Birth Control?

This is probably the most important part of this conversation.

Certain GLP-1-related medications slow gastric emptying.

That means food and some oral medications may move through the digestive system differently.

And when we're talking about medications that need to be absorbed reliably, that deserves attention.

But here's the distinction:

Not all GLP-1 medications have the same contraception guidance.

Tirzepatide and Oral Birth Control

Tirzepatide, found in Mounjaro and Zepbound, can reduce the effectiveness of oral hormonal contraceptives.

Because of this, the prescribing information advises people using oral hormonal birth control to either:

• Switch to a non-oral contraceptive method, or

• Add a barrier method of contraception for four weeks after starting tirzepatide and four weeks after every dose increase.

That is a very specific recommendation, and it's one I want more people to know about.

If you're taking tirzepatide and relying on the pill to prevent pregnancy, please discuss your contraception plan with your prescriber.

What About Semaglutide?

Semaglutide also slows gastric emptying, but available interaction studies have not demonstrated the same clinically significant reduction in oral contraceptive exposure seen with tirzepatide.

So we shouldn't automatically apply tirzepatide's contraception instructions to every medication in the GLP-1 category.

However, severe vomiting or diarrhea can interfere with the reliability of oral contraceptive pills regardless of what caused those symptoms.

If you're experiencing significant gastrointestinal side effects, follow your contraceptive's missed-pill or vomiting guidance and speak with your healthcare professional.

Can GLP-1 Medications Change Your Period?

Some people report changes in their menstrual cycles after starting GLP-1 medications.

That might include more predictable periods, changes in flow, or shifts in cycle length.

But there are several possible explanations.

Changes in weight, energy intake, insulin resistance, underlying conditions, and reproductive hormone patterns can all influence menstruation.

For someone with PCOS and irregular ovulation, improved metabolic health may coincide with more regular cycles.

For someone experiencing rapid weight loss or inadequate nutrition, menstrual cycles may become less regular.

So if your period changes after starting a GLP-1 medication, don't automatically assume the medication is directly changing your reproductive hormones.

And please don't ignore unusual bleeding.

Persistent menstrual changes, very heavy bleeding, significant pain, or missed periods when pregnancy is possible deserve appropriate evaluation.

What If You're Trying to Get Pregnant?

If you're actively trying to conceive, this is a conversation you should have with your prescribing clinician before starting or continuing a GLP-1 medication.

Why?

Because there are important gaps in human pregnancy safety data for these medications.

For example, the prescribing information for semaglutide recommends discontinuing the medication at least two months before a planned pregnancy because of its long elimination period.

Tirzepatide also requires pregnancy planning, but the timing and recommendations should be reviewed specifically for that medication and your circumstances.

Please don't assume that every medication in this category has the same washout period.

And if you become pregnant while taking one, contact your prescriber promptly to discuss stopping treatment and your next steps.

If you're taking a medication for diabetes, it's especially important to make a plan for blood glucose management rather than simply being left without treatment.

What About PCOS?

PCOS is another reason this conversation has become so interesting.

PCOS can involve insulin resistance, irregular ovulation, and metabolic changes.

Because GLP-1-related medications can improve certain metabolic measures, researchers are investigating their potential role in managing selected aspects of PCOS.

Some studies suggest improvements in weight and metabolic markers, and there is interest in whether those changes may also influence menstrual regularity and ovulation.

But the evidence is still evolving.

We need more high-quality research on long-term reproductive outcomes, fertility, and medication safety in people planning pregnancy.

GLP-1 medications are not established as a replacement for individualized PCOS care or fertility treatment.

And PCOS management should never be reduced to weight alone.

Let's Talk About Nutrition, Too

Something else I think deserves more attention is what happens when appetite decreases significantly.

Because these medications can reduce hunger, some people may unintentionally eat less than their bodies need.

That makes nutritional adequacy important.

Protein, iron, folate, vitamin B12, calcium, and other nutrients all play roles in overall health, and nutritional needs vary depending on your diet, medical history, and reproductive stage.

If you're experiencing persistent nausea, vomiting, or difficulty eating enough, please bring that up with your healthcare team.

A supplement doesn't replace adequate nutrition, and it shouldn't be used to compensate for significant medication side effects without addressing the underlying issue.

For anyone planning pregnancy, preconception nutrition deserves its own conversation with a healthcare professional.

Five Questions I'd Ask My Doctor Before Starting a GLP-1

If you're considering one of these medications, here are a few things I'd want you to feel comfortable asking:

1. Could this medication affect the reliability of my current birth control?

2. If I'm planning pregnancy, when should I stop taking it?

3. How might my existing menstrual or metabolic conditions affect treatment?

4. What should I do if I experience vomiting, diarrhea, or significant changes in appetite?

5. What symptoms or side effects should prompt me to contact you?

You deserve answers to these questions before they become problems.

My Biggest Takeaway

GLP-1 medications have opened up important conversations about metabolic health.

And for some people, they can be valuable tools when prescribed appropriately.

But I don't want reproductive health to become an afterthought.

If you're taking a medication that could affect contraception, pregnancy planning, or your nutritional status, you deserve to know.

If you have PCOS, you deserve care that looks beyond the number on the scale.

And if you're thinking about getting pregnant, you deserve a plan that's specific to your medication and your body.

Women's health should never be treated as a side note to another health conversation.

The more informed you are, the better equipped you are to advocate for yourself.

Love,
Giana 💜

Biomedical Engineer & Co-Founder, With Meraki Co.