Two men telling me not to take the only thing I can take when my back’s hurting and I’m pregnant, right?’” Cassidy said. He emphasized that studies that the administration has cited show only an association between the medication and autism rather than causality. “At the same time, as the only approved medication for pain and fever reduction during pregnancy, acetaminophen remains an important tool for pregnant patients and their Physicians,” he said. “Some research links CHRONIC acetaminophen (Tylenol) use during pregnancy to increased autism risk,” Marshall wrote on X. “For years, autism rates climbed while Washington stayed silent,” Rep. Diana Harshbarger, R-Tenn., a pharmacist by training, said on X.