MD, PhD, MAE, FMedSci, FRCP, FRCPEd.

Consider the case of a women who is 3 months pregnant and develops a high and persistent fever (by no means a rare event). Her doctor diagnoses a strep throat and treats her with antibiotics. For lowering her temperature, he would normally have advised paracetamol (acetaminophen). After this was pronounced prohibitively dangerous, he has 3 options:

  1. Give no medicine for the fever.
  2. Give Aspirin.
  3. Give ibuprofen.

What are the risks involved in these three options?

1. Give no medicine for the fever 

High or sustained fever, especially in the first trimester (which the patient is nearing the end of or just finished), has been associated with an increased risk of certain birth defects, including neural tube defects, heart defects, and cleft lip/palate.

2. Give Aspirin

The use of Aspirin during pregnancy, especially at higher doses (not the low dose often used for preeclampsia prevention), carries the following risks:

  • Higher doses of aspirin during early pregnancy raise the risk of pregnancy loss and congenital defects.
  • Higher doses of aspirin are also associated with premature closure of the ductus arteriosus (a fetal heart vessel), fetal kidney problems, and increased bleeding risk for both mother and baby.

Low-dose aspirin is considered safe but may not affect the fever.

3. Give Ibuprofen

  • Some studies suggest an increased risk of miscarriage, if taken around conception or over a long period, though evidence is conflicting.
  • Ibuprofen is contraindicated in the third trimester (after 28 weeks) due to the risk of fetal renal dysfunction, premature closure of the ductus arteriosus or inhibition of uterine contractions. 

What are the consequences?

One can extrapolate that an adherence to a “no paracetamol” policy to treat fever in pregnancy would likely have the following effects in the US:

  1. Over a thousand additional severe birth defects per year that might have been prevented by safely treating a high fever, especially in the first trimester.
  2. Many thousands of additional cases of preterm labor/delivery caused by untreated maternal fever later in pregnancy.
  3. A significant increase in the use of the riskier medicines such as ibuprofen or Aspirin which are associated with fetal risks, leading to hundreds of new cases of fetal kidney and cardiac issues.

In other words, persuading pregnant women to forgo the safest, most effective fever reducer would cause thousands of severe, preventable fetal adverse outcomes per year. This would far outweigh the unproven or even disproven risk of autism from short-term, appropriate paracetamol use.

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