GLP-1 and IVF: Can You Use Semaglutide During Fertility Treatment? (2026)

You're taking semaglutide or tirzepatide for weight loss and planning IVF. Can you continue GLP-1s during fertility treatment? Will weight loss improve your chances? Here's what fertility specialists want you to know.

Why Weight Matters for IVF Success

Obesity significantly impacts fertility and IVF outcomes:

• Lower success rates: Women with BMI >30 have 20-30% lower IVF success rates compared to normal-weight women
• Poorer egg quality: Obesity is associated with lower egg quality and fewer viable embryos
• Higher miscarriage risk: Obesity increases miscarriage risk by 30-40%
• Complications: Higher rates of gestational diabetes, preeclampsia, and cesarean delivery
• Insulin resistance: Common in obesity and PCOS, impairs ovulation and embryo implantation

Losing just 5-10% of body weight before IVF can improve success rates by 20-30% — which is why many fertility clinics now recommend weight loss before starting treatment.

How GLP-1s Can Help Before IVF

GLP-1 medications offer several benefits for women preparing for IVF:

GLP-1 Timeline for IVF

Here's a typical timeline for using GLP-1s before IVF:

Can You Use GLP-1s During Ovarian Stimulation?

This is a gray area. Some fertility clinics allow GLP-1 use during the ovarian stimulation phase (when you're taking injectable hormones to produce multiple eggs), as long as you stop before embryo transfer. Others prefer you stop before starting any fertility medications.

Arguments for continuing during stimulation:

• Continued weight loss may improve egg quality
• Better insulin sensitivity may improve response to fertility medications
• No direct evidence of harm to eggs or embryos

Arguments for stopping before stimulation:

• Lack of safety data on GLP-1s during ovarian stimulation
• Potential for delayed gastric emptying to affect absorption of oral fertility medications
• Nausea and GI side effects may compound fertility medication side effects

Bottom line: Discuss with your fertility specialist. Most clinics have specific protocols based on their experience and your individual situation.

GLP-1s and PCOS-Related Infertility

Women with PCOS (polycystic ovary syndrome) often struggle with both obesity and infertility. GLP-1s can address both issues:

• Insulin resistance: 70% of women with PCOS have insulin resistance, which impairs ovulation. GLP-1s improve insulin sensitivity, often restoring regular ovulation.
• Weight loss: Losing 5-10% of body weight can restore ovulation in 50-60% of women with PCOS.
• Reduced androgens: Weight loss lowers testosterone levels, improving symptoms like acne and hirsutism while improving fertility.
• Natural conception: Some women with PCOS conceive naturally after GLP-1 weight loss, avoiding IVF entirely.

Important: If you have PCOS and start ovulating on GLP-1s, use contraception if you're not ready to conceive. GLP-1s must be stopped before pregnancy.

What If You Get Pregnant on GLP-1s?

Unplanned pregnancies happen. If you discover you're pregnant while taking GLP-1s:

1. Stop the medication immediately
2. Contact your doctor — inform both your prescribing physician and OB/GYN
3. Don't panic — while there's limited data, most early exposures result in normal outcomes
4. Get early prenatal care — your doctor may recommend additional monitoring

Animal studies show potential risks (fetal growth restriction, skeletal abnormalities), but human data is limited. The medication should be stopped, but early exposure doesn't automatically mean poor outcomes.

Maintaining Weight Loss After Stopping GLP-1s

The challenge: you need to stop GLP-1s 2 months before embryo transfer, but you don't want to regain weight. Strategies:

• Structured meal plan: Work with a dietitian to maintain a calorie deficit without medication
• Regular exercise: Aim for 150+ minutes of moderate activity weekly
• Protein focus: High protein intake (100-120g/day) preserves muscle and satiety
• Behavioral support: Consider therapy or support groups to maintain habits
• Metformin: Some doctors prescribe metformin during the washout period to help maintain insulin sensitivity (safe before pregnancy)

The Bottom Line

GLP-1 medications can be a powerful tool for improving IVF success rates in women with obesity. Losing 10-20% of body weight before IVF can improve egg quality, implantation rates, and reduce miscarriage risk.

However, timing is critical: you must stop GLP-1s at least 2 months before embryo transfer or attempting conception. Work closely with your fertility specialist to create a timeline that maximizes weight loss benefits while ensuring safety.

For many women, the weight loss achieved with GLP-1s is the missing piece that makes IVF successful — or even allows natural conception without IVF.