Semaglutide and Fertility: What the Evidence Says

Social media and news outlets have reported a wave of unexpected pregnancies among women taking semaglutide and other GLP-1 agonists. While this has not been systematically studied, several mechanisms may explain this phenomenon:

• Weight loss and ovulation: Excess body weight is a well-established cause of anovulation and irregular menstrual cycles. Weight loss of even 5–10% can restore ovulatory function in overweight women with conditions like PCOS.
• Improved insulin sensitivity: Semaglutide reduces insulin resistance, which is a key driver of hormonal imbalance in polycystic ovary syndrome (PCOS) — the leading cause of anovulatory infertility.
• Oral contraceptive absorption: Semaglutide delays gastric emptying and can cause nausea and vomiting, potentially reducing the absorption and effectiveness of oral contraceptive pills.
• Hormonal normalization: Reduced body fat leads to lower estrogen production from adipose tissue and improved hypothalamic-pituitary-ovarian axis function.

Semaglutide is not recommended during pregnancy. The key concerns include:

• Animal studies: Reproductive toxicity studies in animals showed increased rates of embryo loss, structural abnormalities, and reduced fetal growth at clinically relevant doses.
• No human safety data: There are insufficient controlled studies of semaglutide in pregnant women. The FDA classifies it with a recommendation to discontinue before planned pregnancy.
• Nutritional concerns: The appetite suppression and reduced caloric intake caused by semaglutide could lead to inadequate nutrition during critical periods of fetal development.
• Washout period: Semaglutide has a half-life of approximately 7 days. Most guidelines recommend discontinuing at least 2 months before attempting conception to ensure the drug is fully cleared.

If you discover you are pregnant while on semaglutide, discontinue the medication immediately and contact your healthcare provider.

For women struggling with fertility, semaglutide's effects on weight and metabolism may indirectly support conception:

• PCOS: Weight loss with semaglutide may improve menstrual regularity, restore ovulation, and reduce androgen levels in women with PCOS.
• IVF outcomes: Some fertility specialists have noted improved IVF outcomes in patients who achieved weight loss before treatment cycles, though semaglutide must be stopped before starting IVF.
• Hormonal balance: Reduced insulin levels and improved metabolic markers may create a more favorable hormonal environment for conception.

However, semaglutide should be viewed as a pre-conception optimization tool, not a fertility treatment. It must be discontinued well before pregnancy attempts.

Less attention has been paid to semaglutide's effects on male reproductive health, but emerging data suggests potential impacts:

• Testosterone: Weight loss generally increases testosterone levels in overweight men. Semaglutide-associated weight loss may improve low testosterone related to obesity.
• Sperm quality: Animal studies have shown mixed results. Some rodent studies observed reduced sperm motility at high doses, while others showed no significant effects.
• Erectile function: Improved metabolic health and weight loss may enhance erectile function, particularly in men with obesity-related sexual dysfunction.

Men planning to father children should discuss semaglutide use with their healthcare provider, particularly regarding timing relative to conception attempts.

If you are planning to conceive, follow these evidence-based recommendations:

• Women: Discontinue semaglutide at least 2 months (8 weeks) before attempting conception. Some providers recommend a 3-month washout for additional safety.
• Men: While no formal washout period is established for male partners, discuss timing with your healthcare provider.
• Contraception: Use non-oral contraceptive methods while on semaglutide if you want to prevent pregnancy, as oral contraceptives may be less effective.
• Transition plan: Work with your provider to develop a weight maintenance strategy for the post-semaglutide, pre-pregnancy period.
• Prenatal preparation: Begin prenatal vitamins and folic acid supplementation before discontinuing semaglutide.

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