Understanding Bonjesta Side Effects Before You Start

Your doctor prescribed Bonjesta to help with your morning sickness, and you're ready for relief. But like any medication, it comes with potential side effects — and when you're pregnant, it's natural to want to know exactly what to expect.

The good news: Bonjesta has a relatively mild side effect profile, and the most common issue — drowsiness — is manageable for most women. This guide covers everything you need to know about Bonjesta side effects, based on FDA labeling and clinical data, so you can feel confident about your treatment.

What Is Bonjesta?

Bonjesta is a prescription medication made by Duchesnay USA for treating nausea and vomiting of pregnancy (NVP). It combines two active ingredients — doxylamine succinate (an antihistamine) and pyridoxine hydrochloride (vitamin B6) — in a dual-layer extended-release tablet. Each tablet contains 20 mg of each ingredient.

For a deeper look at what Bonjesta is and how it works, see our guides on Bonjesta uses and dosage and how Bonjesta works.

Common Side Effects

The most frequently reported side effects of Bonjesta are related to its antihistamine component (doxylamine). According to FDA labeling, these include:

• Drowsiness/Somnolence — This is by far the most common side effect. Doxylamine is an antihistamine that crosses into the brain and causes sedation. Many women notice this most when they first start the medication or after increasing their dose.

In clinical trials, drowsiness was the primary adverse reaction reported. The extended-release formulation of Bonjesta was designed to reduce the pill burden (1–2 tablets per day versus up to 4 with Diclegis), but the drowsiness effect remains similar.

How Common Is Drowsiness?

Drowsiness is common enough that the FDA label includes specific warnings about it. However, many women find that:

• The drowsiness is most noticeable in the first few days of treatment
• Taking the tablet at bedtime (as recommended) helps, since you sleep through the peak sedation
• The drowsiness often improves as your body adjusts over several days

Serious Side Effects

Serious side effects from Bonjesta are rare, but they can happen. Contact your doctor immediately or seek emergency medical attention if you experience:

• Allergic reaction — Signs include hives, difficulty breathing, or swelling of your face, lips, tongue, or throat. This is a medical emergency.
• Falls or accidents due to drowsiness — The sedating effect of Bonjesta can impair your coordination and reaction time. This is especially important to be aware of during pregnancy, when balance may already be affected.
• Severe drowsiness that doesn't improve — If you're so drowsy that you can't function or stay awake during the day after taking Bonjesta only at bedtime, talk to your doctor about adjusting your dose.

Specific Populations and Precautions

Bonjesta is specifically designed for pregnant women, but certain groups need extra caution:

Pregnancy

Bonjesta is one of the few medications that is FDA-approved specifically for use during pregnancy. The combination of doxylamine and pyridoxine has decades of safety data in pregnant women. It does not carry a boxed warning.

Breastfeeding

Bonjesta is contraindicated during breastfeeding. Doxylamine can pass into breast milk and may cause drowsiness or other effects in a nursing infant. If you're breastfeeding, talk to your doctor about alternative options.

Age

Bonjesta is not approved for anyone under 18 years of age.

Other Medical Conditions

Use Bonjesta with caution if you have:

• Asthma — Antihistamines can thicken mucus and worsen respiratory symptoms in some people
• Glaucoma — Doxylamine has anticholinergic properties that can increase eye pressure
• Gastrointestinal obstruction or stomach ulcers — Anticholinergic effects may slow digestion
• Bladder obstruction — Anticholinergic effects can cause urinary retention

Always tell your doctor about all your medical conditions before starting Bonjesta.

How to Manage Side Effects

Here are practical tips for dealing with the most common side effects of Bonjesta:

Managing Drowsiness

• Take it at bedtime. The standard starting dose is 1 tablet at bedtime. This way, the peak sedation happens while you're sleeping, and you wake up with nausea relief.
• Don't drive or operate heavy machinery until you know how Bonjesta affects you. The drowsiness can be significant, especially in the first few days.
• Avoid alcohol. Alcohol increases the drowsiness caused by Bonjesta. This should already be avoided during pregnancy, but it's worth emphasizing.
• Skip other sedating medications. Don't combine Bonjesta with sleep aids, antihistamines like Benadryl (Diphenhydramine), or other CNS depressants unless your doctor says it's okay. For more details, see our drug interactions guide.
• Give it time. For many women, the drowsiness improves after the first few days as your body adjusts to the medication.

If Side Effects Don't Improve

If drowsiness remains a problem after a week or more, talk to your doctor. They may suggest:

• Staying at the lower dose (1 tablet at bedtime only) instead of increasing to 2 tablets per day
• Switching to Diclegis or another alternative that may work better for you
• Adjusting the timing of your dose

When to Call Your Doctor

Call your doctor or go to the emergency room if you experience:

• Signs of an allergic reaction (hives, trouble breathing, swelling of face/lips/tongue/throat)
• Extreme drowsiness that interferes with your ability to function safely
• A fall or accident related to drowsiness or impaired coordination
• Any new or worsening symptoms that concern you

It's always better to call and find out everything is fine than to ignore a potential problem during pregnancy.

Final Thoughts

Bonjesta is one of the safest and most well-studied medications for morning sickness, with decades of data supporting the doxylamine/pyridoxine combination in pregnancy. The most common side effect — drowsiness — is manageable for most women, especially when the tablet is taken at bedtime as recommended.

Know what to watch for, communicate with your doctor, and don't hesitate to reach out if something doesn't feel right. For help finding Bonjesta at a pharmacy near you, visit Medfinder. And for ways to reduce the cost, check out our savings guide.