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Asthma Risk in Children Linked to PPI Heartburn Drugs

teddy bear and asthma machine

Moms who take heartburn drugs during pregnancy may increase the risk of having a baby born with asthma, according to a review of studies.

Researchers from the universities of Edinburgh and Tampere in Finland reviewed studies that combed through the data of more than 1.6 million patients. They found children born to mothers who took acid-blocking drugs — such as proton pump inhibitors or H2 blockers — during pregnancy were a third more likely to visit a doctor for asthma.

Authors of the study published in The Journal of Allergy and Clinical Immunology linked PPI drugs such as Prilosec (omeprazole) and Nexium (esomeprazole) to a 30 percent increased risk for childhood asthma. H2 blockers such as Pepcid had a 46 percent increased risk. Some data also suggested an increase in skin allergy risk.

Scientists don’t know exactly why these drugs increase the risk for asthma, but it may be that the drugs interfere with the mother’s digestion. These undigested food allergens then pass on to the fetus.

Suffered kidney problems after taking a proton pump inhibitor? Get a Free Case Review

“Gastric reflux is common in pregnancy,” study author Dr. Aziz Sheikh, professor at the University of Edinburgh, told the New York Times. “And in the majority of women it can be managed with lifestyle or diet changes.”

Study authors said the data did not prove that the drugs caused asthma, and urge women not to stop taking prescribed medications.

“It is important to stress that this association does not prove that the medicines caused asthma in these children and further research is needed to better understand this link,” Sheikh told The Sun.

Instead of PPIs or H2 blockers, he recommended “milder treatments like chewable antacid tablet” for moms suffering from reflux.

PPIs Linked to Kidney Disease, Stroke

PPIs are one of the most popular drug classes, and doctors write more than 20 million prescriptions a year for them. In addition, because these drugs are available over the counter many people may think they have few side effects.

But, the asthma study review is the latest of several to link PPIs to a host of side effects.

The U.S. Food and Drug Administration released safety communications linking PPIs to stomach infections, low magnesium levels and fractures of the hip, spine and wrist.

In 2011, a German study found long-term users of PPIs significantly increased the risk of dementia. A Stanford School of Medicine study in 2015 followed 3 million American PPI users and linked the medications to a 20 percent increased risk of heart attack.

JAMA Internal Medicine published a 2016 study that found PPI users had a 20 to 50 percent increased risk of developing chronic kidney disease.

Most recently in December 2016, a Danish Heart Foundation study found one PPI, Protonix (pantoprazole), increased stroke risk by as much as 94 percent while Prevacid (lansoprazole) increased it by 30 percent.

Some patients who took PPIs filed lawsuits against drugmakers after suffering side effects including kidney damage and fractures.

Michelle Llamas, Senior Content Writer
Written By Michelle Llamas Senior Writer

Michelle Llamas has been writing articles and producing podcasts about drugs, medical devices and the FDA for nearly a decade. She focuses on various medical conditions, health policy, COVID-19, LGBTQ health, mental health and women’s health issues. Michelle collaborates with experts, including board-certified doctors, patients and advocates, to provide trusted health information to the public. Some of her qualifications include:

  • Member of American Medical Writers Association (AMWA) and former Engage Committee and Membership Committee member
  • Centers for Disease Control and Prevention (CDC) Health Literacy certificates
  • Original works published or cited in The Lancet, British Journal of Clinical Pharmacology and the Journal for Palliative Medicine

2 Cited Research Articles writers follow rigorous sourcing guidelines and cite only trustworthy sources of information, including peer-reviewed journals, court records, academic organizations, highly regarded nonprofit organizations, government reports and interviews with qualified experts. Review our editorial policy to learn more about our process for producing accurate, current and balanced content.

  1. Bakalar, N. (2017, January 10). Heartburn Drugs in Pregnancy Tied to Asthma in Babies. Retrieved from
  2. Downey, A. (2017, January 9). WHEEZE WARNING Kids born to mums on heartburn medication are ‘a THIRD more likely to get asthma’. Retrieved from
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