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Trending Topics & Drug Approvals: September 2025

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September 30, 2025

Trending Topics 

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Acetaminophen (Tylenol) update 

The United States (U.S.) Food and Drug Administration (FDA) announced the initiation of a safety label change for products containing acetaminophen (Tylenol, other brand names) based on evidence suggesting an association between use during pregnancy and an increased risk for neurological conditions (e.g., autism, attention-deficit/ hyperactivity disorder [ADHD]). The Agency cites large-scale cohort studies (e.g., Nurses’ Health Study II, Boston Birth Cohort) demonstrating this association. Per the FDA, some data suggest chronic use of acetaminophen throughout pregnancy poses the greatest risk. Notably, a causal relationship between acetaminophen and these neurological conditions has not been established and other medical literature refutes the association. The FDA has published a Notice to Physicians recommending health care professionals (HCPs) minimize the use of acetaminophen during pregnancy for routine low-grade fevers. However, the Agency also notes that acetaminophen is the safest over-the-counter (OTC) pain reliever/fever reducer to use in pregnancy as other medications, such as aspirin and ibuprofen, have documented adverse effects on a developing fetus.  

In response to the FDA, the American College of Obstetricians and Gynecologists (ACOG) has issued a statement affirming the safety and benefits of acetaminophen during pregnancy. ACOG states the FDA/Department of Health and Human Services (HHS) announcements are not supported by the full body of scientific evidence and simplifies the multifactorial, complex causes of neurological problems in children. Furthermore, ACOG states not a single reputable study has succinctly concluded use of acetaminophen in any trimester of pregnancy results in neurodevelopmental disorders in the offspring and the two highest-quality studies on this subject did not find a significant association between use of acetaminophen during pregnancy and the risk of autism, ADHD or intellectual disability in the children. The American Academy of Pediatrics (AAP) also states that research does not show a causal link between acetaminophen use in children and autism and that a single, root cause of autism has not been identified. The AAP has also issued a separate statement refuting the claim that vaccines are linked to autism.    
 

Leucovorin (Wellcovorin) update 

The FDA has announced steps towards the approval of leucovorin calcium (Wellcovorin) for patients with cerebral folate deficiency (CFD). Patients with CFD can exhibit seizures, difficulty with movement and coordination as well as developmental delays with autistic features (e.g., social communication challenges, sensory processing issues, repetitious behaviors). The Agency is collaborating with the manufacturer of Wellcovorin (GSK) to develop a process for documentation of the scientific evidence required to demonstrate safety and efficacy of Wellcovorin for pediatric and adult patients with CFD. HHS has also announced the National Institutes of Health (NIH) will launch confirmatory trials as well as new research, including safety studies, on the use of leucovorin. HHS notes that leucovorin is not a cure for autism spectrum disorder (ASD) and may only improve speech-related deficits for a subset of children with ASD. Other non-pharmacological treatments (e.g., behavioral therapy) are also recommended for these children. The NIH has also announced recipients of the Autism Data Science Initiative (ADSI), providing more than $50 million for 13 projects addressing autism.
 

ACIP meeting update 

Five new members were appointed to the Center for Disease Control and Prevention’s (CDC) Advisory Committee on Immunization Practices (ACIP) prior to the committee convening in mid-September. ACIP met and discussed measles, mumps, rubella, varicella (MMRV) vaccine, hepatitis B vaccines and coronavirus disease 2019 (COVID-19) vaccines.  
  • ACIP voted that for children under four years of age, immunization for varicella should occur through a standalone vaccination rather than with the combination of a MMRV vaccine. This decision was based on approximately five more febrile seizures per 10,000 doses in children who received the combination MMRV vaccine compared with receiving separate immunizations for varicella and measles, mumps and rubella (MMR). The standalone varicella vaccine is administered at the same time as the MMR vaccine. Previously, parents/caregivers could choose to administer the MMRV instead of separate MMR and varicella vaccines, if preferred.  
  • ACIP recommended universal testing of hepatitis B in all pregnant women. The advisory tabled the vote for changing the hepatitis B immunization schedule.  
  • ACIP also recommended COVID-19 vaccination be determined by individual decision-making for all individuals at least six months of age and older; the HHS states that this immunization approach allows for immunization coverage through all payment mechanisms (e.g., Vaccines for Children Program, Children’s Health Insurance Program, Medicaid, Medicare). 
Recommendations from ACIP require final approval by the CDC director before becoming incorporated into the CDC immunization schedule. 

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