Weight Loss Drugs Don’t Reduce Oocyte Retrieval

The use of glucagon-like peptide 1 (GLP-1) agonists within a year had no apparent effect on the number of oocytes retrieved in controlled ovarian hyperstimulation (COH), based on data from 73 patients in a multicenter study.

Obesity rates continue to rise in women of reproductive age and many women are using GLP-1 agonists for weight loss, but data on the effect of these drugs on fertility treatments are lacking, said Victoria K. Lazarov, MD, of Icahn School of Medicine at Mount Sinai, New York City, in an abstract presented at the American Society for Reproductive Medicine (ASRM) 2024 scientific congress.

Clinical opinions regarding the use, duration, and discontinuation of GLP-1 agonists during fertility treatments are variable given the limited research, Lazarov noted in her abstract. More data are needed to standardize patient counseling, she said.

Lazarov and colleagues reviewed data from patients who sought treatment at clinics affiliated with a national fertility network from 2005 to 2023 who also utilized a GLP-1 agonist within 1 year of COH.

The study population included 73 adult women; participants were divided into six groups based on the number of days without GLP-1 agonist use prior to retrieval (0-14, 15-30, 31-60, 61-90, 91-180, and 181-365 days). The primary outcome was oocyte yield following COH.

Overall, the mean oocyte yields were not significantly different across the six timing groups (14.4, 16.2, 16.8, 7.7, 13.8, and 15, respectively; P = .40).

In a secondary subgroup analysis, the researchers found an inverse relationship between oocyte yield and timing of GLP-1 agonist discontinuation in patients with body mass index (BMI) > 35. However, no changes in oocyte yield were observed in patients with BMIs in the normal or overweight range. Neither duration of GLP-1 agonist use or indication for use had a significant effect on oocyte yield across exposure group.

The findings were limited by several factors, including the relatively small study population, especially the small number of patients with obesity, the researchers noted. “Additional investigation is needed to clarify potential effects of GLP-1 agonist use on aspiration risk during oocyte retrieval and embryo creation outcomes,” the researchers wrote in their abstract.

However, the results suggest that most women who use GLP-1 agonists experience no significant effects on oocyte retrieval and embryo creation, and that GLP-1 agonists may have a role in improving oocyte yield for obese patients, the researchers concluded.

Larger Studies Needed for Real Reassurance 

“Infertility patients who are overweight have lower chances for conception and higher risks of pregnancy complications,” said Mark Trolice, MD, professor at the University of Central Florida College of Medicine, Orlando, and founder/director of The IVF Center, Winter Park, Florida, in an interview.

The use of GLP-1 agonists has dramatically increased given the medication’s effectiveness for weight loss, as well as its use to manage diabetes, but the use of GLP-1 agonists in pregnancy is not well known and current recommendations advise discontinuation of the medication for 6-8 weeks prior to conception, said Trolice, who was not involved in the study.

GLP-1 agonist use is associated with lowered blood glucose levels, Trolice said. “Additionally, the medication can delay gastric emptying and suppress appetite, both of which assist in weight management,” he said.

The current study examined whether there was a difference in oocyte retrieval number in women based on days of discontinuation of GLP-1 agonists prior to the procedure, Trolice told Medscape Medical News. “Given the drug’s mechanism of action, there is no apparent biological influence that would impact oocyte yield. Consequently, the study outcome is not unexpected,” he said.

The study purports potential reassurance that GLP-1 exposure, regardless of the duration of discontinuation, has no impact on egg retrieval number, said Trolice. However, “Based on the size of the study, to accept the findings as definitive would risk a type II statistical error,” he said.

Two key areas for additional research are urgently needed, Trolice said, namely, the duration of time to discontinue GLP-1 agonists, if at all, prior to conception, and the discontinuation interval, if at all, prior to anesthesia to avoid airway complications.

The American Society of Anesthesiologists advises patients on daily dosing to consider holding GLP-1 agonists on the day of a procedure or surgery, and those on weekly dosing should consider discontinuing the medication 1 week before the procedure or surgery, Trolice noted.

The study received no outside funding. The researchers had no financial conflicts to disclose. Trolice had no financial conflicts to disclose and serves on the editorial advisory board of OB/GYN News.