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Should you take Zofran (Ondansetron) for vomiting during pregnancy? Let's be aware of this!

MBBS
Medically Reviewed by MBBS ✓ Medically Reviewed
📅 Updated: Jul 14, 2026 • ⏱ 6 min read • Editorial policy
Should you take Zofran (Ondansetron) for vomiting during pregnancy? Let's be aware of this!
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The nausea and vomiting that occurs during the first few months of pregnancy is called ' Morning Sickness '. Although the name suggests morning sickness, it can occur at any time of the day. For some mothers, it can be very severe. You may vomit so much that you can't keep anything down. So, at times like this, your doctor may prescribe a medication called Zofran. Today, let's talk about what Zofran is, how safe it is, and what you need to know about it.

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What is Zofran (Ondansetron)?

Simply put, Zofran is the brand name for the drug Ondansetron. It was originally introduced to control nausea and vomiting caused by chemotherapy in cancer patients. It works by blocking the action of a chemical messenger (neurotransmitter) in our brain called serotonin . This serotonin is what helps control things like our appetite, digestion, and mood.

In addition to cancer treatment, doctors use this medicine in several other situations.

  • Vomiting due to anesthesia
  • For vomiting caused by radiation therapy
  • After some surgeries

Meanwhile, the use of this medicine for severe vomiting during pregnancy, also known as 'Morning Sickness', has become very popular. According to some reports, this medicine is recommended to about one in four pregnant mothers . This medicine can reduce the risk of dehydration and weight loss when vomiting excessively.

Zofran can be given in three ways. It is most commonly given as a small tablet that dissolves under the tongue. In addition, it can be given as an injection into a muscle or intravenously (IV) with saline if necessary.

Is it really safe to use Zofran during pregnancy?

This is the biggest problem that many people have. Although the US Food and Drug Administration (FDA) has approved this drug for vomiting in cancer patients, it has not yet officially approved it for vomiting during pregnancy . But don't be afraid. Even if a doctor doesn't approve it for a certain condition, he knows very well about the benefits of that drug and recommends it for another condition, which is called "off-label use."

Many studies have shown that taking this medication during the first trimester of pregnancy does not increase the risk of major birth defects .

  • A study conducted by the CDC in the United States showed that mothers who took Zofran did not have an increased risk of severe birth defects.
  • A large study conducted in Denmark in 2013 showed that this drug does not increase the risk of the following:
  • Low birth weight
  • Pre-term delivery
  • Baby's growth is slowing down.
  • Serious birth defects
  • Stillbirth
  • Miscarriage

But there is a small thing. These studies show a very small risk. That is, there may be a very small, negligible risk of cleft palate and certain heart defects in children exposed to Zofran. Statistically speaking, this risk is less than 3 in 10,000 children born to mothers who take Zofran. So this is very rare. These studies also say that further research is needed on this.

Another important thing is that in 2011, the FDA warned that Zofran could cause certain maternal heart issues. Specifically, conditions called QT prolongation and torsade de pointes . These are conditions that cause irregular heartbeats. This risk is also very small, but if you have a heart condition, you should definitely tell your doctor about it before taking this medication.

What are the side effects of this medicine?

Like any medicine, Zofran can have some minor side effects. Let's see what they are. You can understand these clearly from the table below.

Type of side effect Characteristics
Common side effects (usually not serious)
  • Drowsiness
  • Feeling tired
  • Headache
  • Constipation
  • Feeling of weakness
Serious side effects (seek medical advice immediately!)
  • Skin rash, itching, swelling (rash, hives)
  • Chest pain
  • Dizziness
  • Difficulty breathing
  • Fever
  • Seizures
  • If you experience any of these serious side effects, call your doctor immediately . If possible, go to the Emergency Department (ETU) of the nearest hospital. This is very important.

    Are there no other simple ways to help with vomiting?

    Yes, there definitely is. Before resorting to a medication like Zofran, your doctor will advise you to try these simple things.

    Change in diet

    Many times, you may be vomiting because of certain foods. Staying away from oily, spicy, and highly fragrant foods can provide great relief. Studies show that 9 out of 10 pregnant mothers can control vomiting by controlling their diet alone.

    Vitamin B6

    Vitamin B6 is something that helps reduce nausea. But you should only take it in the dosage that your doctor tells you. It is generally not good to take more than 100 milligrams (100mg) per day. Because doing so can cause temporary nerve damage.

    Ginger

    Ginger is also good for nausea. Drinking ginger tea or using a natural product containing ginger can provide relief.

    💡 Take-Home Message

    • Zofran (Ondansetron) is a medication that must be prescribed by a doctor. Never take this medication without your doctor's advice.
    • Although many studies have confirmed its safety, be aware of the small but significant risks to both the baby and the mother. Talk to your doctor about this openly.
    • It is essential to inform your doctor about any other medical conditions you have (especially heart disease) or other medications you are taking.
    • Before resorting to medication for severe vomiting, try simple methods such as dietary changes, vitamin B6, and ginger under the guidance of your doctor.
    • If you experience any serious side effects after taking the medicine, seek medical advice immediately.
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