GLP-1 and Fertility
How Ozempic, Wegovy & Semaglutide Affect Conception — and When to Stop
GLP-1 receptor agonists can powerfully improve fertility by addressing the obesity-driven hormonal disruption that prevents ovulation and impairs sperm quality. But the same medications must be discontinued before you try to conceive. Here is everything you need to know.
How GLP-1 Medications Improve Fertility
The relationship between body weight and fertility is well established. Obesity disrupts the hypothalamic-pituitary-ovarian axis in women, suppressing the normal hormonal signals that trigger ovulation. In men, excess adipose tissue converts testosterone to estrogen, reducing sperm production and motility. GLP-1 receptor agonists address these problems primarily through medically significant weight loss.
Studies consistently show that weight loss of just 5% of body weight is sufficient to restore ovulatory cycles in a significant proportion of women with obesity-related anovulation. At 10% weight loss, the majority of women experience normalization of menstrual cycles. GLP-1s — particularly semaglutide and tirzepatide — produce average weight losses of 15–22% in clinical trials, well above the threshold needed to restore reproductive function.
In men, GLP-1-driven weight loss has been shown to significantly increase total and free testosterone, reduce estradiol, improve sperm motility and morphology, and restore libido. These improvements emerge within 3–6 months of meaningful weight loss and continue to deepen as weight reduction progresses.
Critical Fertility Considerations
Stop 2 Months Before Trying to Conceive
GLP-1 receptors are expressed in the placenta, ovaries, and fetal tissues, but their effects on fetal development are unknown. No adequate safety studies exist in human pregnancy. Novo Nordisk recommends stopping semaglutide (Ozempic/Wegovy) at least 2 months before attempting conception. Eli Lilly similarly recommends stopping tirzepatide (Mounjaro/Zepbound) before pregnancy. This washout period covers approximately 5 drug half-lives.
Oral Contraceptives May Be Less Effective
GLP-1 medications slow gastric emptying, which can reduce the absorption of oral medications taken at the same time — including oral contraceptive pills. This may lower OCP blood levels enough to impair contraceptive protection. During GLP-1 therapy, non-oral contraception (IUD, hormonal implant, patch, vaginal ring, injection) is generally recommended to ensure reliable pregnancy prevention.
Male Fertility Benefits
Men who are overweight or obese often have low testosterone, high estrogen, poor sperm quality, and erectile dysfunction — all of which can contribute to couple infertility. Clinical evidence shows that GLP-1-mediated weight loss restores testosterone toward normal, improves sperm parameters, and enhances erectile function. Men planning a family should discuss GLP-1 use and timing with their urologist or reproductive specialist.
Pre-Conception Weight Loss Protocol
The optimal approach for many patients is a structured pre-conception protocol: use GLP-1 therapy to achieve target weight, then taper and discontinue the medication, allow a 2-month washout, and then attempt conception at the healthier body weight. This approach maximizes the fertility benefits of weight loss while eliminating fetal exposure to GLP-1 drugs. Document this journey carefully with a tracker like Shotlee.
What to Track on Your Fertility Journey
Whether you are using GLP-1 therapy as a pre-conception weight loss tool or monitoring your reproductive health during treatment, systematic tracking gives you and your healthcare team the data needed to optimize your plan. Shotlee makes it easy to log injections, body weight, and notes in one place.
Frequently Asked Questions
Can you get pregnant while taking Ozempic or Wegovy?
Yes, and this can happen unexpectedly. GLP-1 medications can restore ovulation in women who were previously anovulatory due to obesity or PCOS — meaning women who thought they could not conceive may become fertile while on treatment. Effective contraception is essential during GLP-1 therapy if you are not actively trying to conceive. Critically, GLP-1s must be stopped before attempting pregnancy — Novo Nordisk recommends stopping semaglutide at least 2 months before trying to conceive.
How long should I stop Ozempic before trying to get pregnant?
Novo Nordisk, the maker of Ozempic and Wegovy, recommends stopping semaglutide at least 2 months before attempting conception. For tirzepatide (Mounjaro/Zepbound), Eli Lilly similarly recommends stopping before pregnancy. The extended washout period is required because GLP-1 medications have long half-lives and because no safety data exist for their use in human pregnancy.
Do GLP-1 medications affect male fertility?
Obesity-related hormonal dysfunction in men — including low testosterone, elevated estrogen, and poor sperm quality — often improves significantly with the weight loss achieved on GLP-1 therapy. Studies have documented increases in total and free testosterone, improved sperm motility, and better erectile function in men who lose significant weight on GLP-1 medications. However, men should also discuss stopping GLP-1s with their doctor when they are trying to father a child.