
This medicine your mom took while pregnant in the ‘60s or ‘70s may increase your risk of colorectal cancer
Morning sickness is now understood as a healthy immune response during pregnancy, not a sign of illness—while past medications like Bendectin are under scrutiny for long-term risks.
🤰 Morning Sickness: From Misunderstood Ailment to Evolutionary Adaptation
Nausea and vomiting during pregnancy—commonly known as morning sickness—affect up to 80% of pregnant women, especially in the first trimester. Despite its name, symptoms can occur at any time of day. Historically dismissed as psychosomatic or a sign of a troubled pregnancy, new research from UCLA reframes morning sickness as a biologically protective immune response.
According to a 2025 study published in Evolution, Medicine and Public Health, UCLA researchers found that morning sickness is linked to a delicate inflammatory balance in the immune system. This response helps the mother’s body tolerate the fetus—whose genetic makeup is half foreign—while still defending against infections and harmful substances (ScienceDaily).
“Nausea, vomiting or aversions to foods or smells are not indications that something is going wrong… It’s likely an indication that everything is moving along normally,” said UCLA anthropology professor Daniel Fessler.
The study tracked cytokine levels—immune system proteins—in 58 pregnant women and found that those with stronger symptoms had a heightened immune response, suggesting their bodies were actively protecting both themselves and their developing babies (Moneycontrol).
💊 Bendectin: A Cautionary Tale in Pregnancy Medication
Approved in 1956, Bendectin was once widely prescribed to treat morning sickness. It combined:
- Dicyclomine (antispasmodic)
- Doxylamine (antihistamine)
- Vitamin B6 (pyridoxine)
By the mid-1970s, 25% of pregnant women were believed to use it. However, Bendectin was reformulated in 1976 to remove dicyclomine, and voluntarily discontinued in 1983 amid lawsuits alleging birth defects.
A 2023 study from UTHealth Houston, published in JNCI Cancer Spectrum, tracked over 14,500 women who gave birth between 1959 and 1967. It found that fetuses exposed to Bendectin were three times more likely to develop colorectal cancer as adults. Researchers suspect dicyclomine may have targeted the fetus’s developing gastrointestinal tract, though further study is needed to isolate its effects.
⚠️ Dicyclomine and Modern Alternatives
Today, dicyclomine is used to treat irritable bowel syndrome, but it carries risks such as:
- Dizziness
- Dry mouth
- Blurry vision
- Nausea
- Drowsiness
- In severe cases: heart rate changes, blood pressure fluctuations, and heat intolerance
Pregnant women should only take dicyclomine under strict medical supervision.
In contrast, Diclegis, containing doxylamine and pyridoxine, was FDA-approved in 2013 and is considered a safer option for managing morning sickness.
🧠 Medication Scrutiny and Public Debate
The safety of medications during pregnancy remains under scrutiny. Recently, President Trump highlighted concerns about acetaminophen (Tylenol) and its potential link to autism, sparking renewed debate. However, health experts maintain that acetaminophen is still safe and necessary for managing fever and pain during pregnancy when used appropriately.
📝 Final Takeaway
Morning sickness is no longer seen as a mere inconvenience—it’s a biological signal of a healthy pregnancy, shaped by evolution to protect both mother and fetus. While medications like Bendectin once dominated treatment, their legacy underscores the importance of ongoing research and caution in prenatal care.
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