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Actress Mayim Bialik Describes Severe Reaction to Single GLP-1 Injection

Bialik, who has multiple autoimmune diagnoses, said one low-dose shot left her so dehydrated she needed IV fluids.

Mayim Bialik and Jim Parsons at PaleyFest 2013 for the TV show "Big Bang Theory"
Mayim Bialik and Jim Parsons at PaleyFest 2013 fo…      Mayim Bialik    iDominick / Wikimedia Commons (CC BY-SA 2.0)
By Free News Press Editorial Team
Published June 8, 2026 at 1:46 AM PDT

Actress Mayim Bialik says a single low-dose injection of a GLP-1 medication led to weeks of severe gastrointestinal symptoms that left her unable to keep down food or water, according to a report by Fox News.

Bialik, 50, best known for her role on The Big Bang Theory, wrote about the experience in an essay for The Free Press titled "My GLP-1 Nightmare." She said weight loss was not her primary reason for taking the drug. "I went on a weight-loss drug because a doctor told me it might help ease symptoms I've struggled with for basically my entire adult life," she explained.

Bialik was diagnosed with the autoimmune disorder Grave's disease at age 23. In the 25 years that followed, she wrote that she experienced unexplained symptoms including "full-body rashes and welts, severe histamine reactions to foods and smells, palpitations, hourly wake-ups for an entire year, crying jags alternating with crippling depression." She went on to receive a series of diagnoses including connective tissue disease, mast cell activation syndrome, Sjögren's syndrome, and dysautonomia. "But each was really just a label for a larger breakdown that no single specialist could quite explain," she wrote.

Three different doctors recommended the GLP-1, she said, because the drugs have shown promise in reducing the systemic inflammation that drives autoimmune conditions. She had already tried several treatments that had not worked and wrote that she was hopeful the drug could be the solution. The experience quickly went in a different direction.

"I took one shot of the lowest dose of a synthetic GLP-1, and to say I had an adverse reaction would be somewhat of an understatement," she said. "Explosive, uncontrollable diarrhea. Sulfur burps so violent they left me afraid to open my mouth in public. Sneezing attacks every time I tried to eat or drink—which apparently has a name, snatiation."

She described the days that followed in detail. "For the first two [days], I ate maybe one cup of rice and half a banana," she said. "Also some broth, which promptly left my body. I couldn't even keep electrolyte drinks down." She added: "Everything exited with a rage that left me weak and debilitated."

Bialik said she also experienced cramping, bloating, and full-body aching as though she had the flu. She struggled to hold down even small sips of water and eventually needed IV fluids because of the dehydration.

GLP-1 drugs have grown rapidly in use across the United States as treatments for obesity and type 2 diabetes, and doctors have increasingly explored their potential benefits for other conditions including inflammation-related disorders. Bialik's account describes one of the more severe adverse reactions reported publicly by a known figure, though she acknowledged she had a complex pre-existing medical history that may have contributed to the intensity of her response.

Mayim Bialik at Camp Bondsteel, Kosovo, July 4, 2019. USO Tour, visiting troops in six countries in three combatant commands. (U.S. Army National Guard photo by Sgt. 1st Class Jim Greenhill)
Mayim Bialik at Camp Bondsteel, Kosovo, July 4, 2…      Mayim Bialik    Chief National Guard Bureau from USA / Wikimedia Commons (CC BY 2.0)