Dayquil while breastfeeding

dayquil while breastfeeding

Can you take Dayquil while breastfeeding ?

It is hard to choose the medications when you get sick, especially if you are breastfeeding. You may consider which medications are safe for your little baby? Are there any risks to your baby if you take flu or cold medications? How about using Dayquil while breastfeeding?

When it comes to cold and flu, Dayquil is known as the most effective medicine in reducing the symptoms. Breast milk is best for your baby because it contains nutrients and vitamins your baby need in the first six months. Furthermore, there are some disease-fighting substances that keep your baby away from illness.

So, the quality of your breast milk is very important, but there are some medications might affect your milk supply and then, actually make your breast milk unsafe for your baby.

Here are some important facts about over the counter medications, especially Dayquil, while you are breastfeeding.

When women get the cold or flu, they often look for Dayquil. Breastfeeding moms should know that Dayquil comes in many various formulations to treat the common cold or flu. To figure out what you can take while breastfeeding, you should pay attention to the below active ingredients in Dayquil formulations.

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A.Active Ingredients

Dayquil contains the following active ingredients:

  • Dayquil Sinex (phenylephrine, oxymetazoline, acetaminophen)
  • DayQuil Cough (dextromethorphan)
  • DayQuil Mucus Control DM (dextromethorphan, guaifenesin)
  • DayQuil Cold & Flu (dextromethorphan, phenylephrine, acetaminophen)
  • DayQuil Severe Cold & Flu (acetaminophen, dextromethorphan, guaifenesin, phenylephrine)


Although there are no clear evidence that phenylephrine passes directly into your breast milk, it is possible decrease your milk production. Phenylephrine is close in structure and mechanism of action when compared to pseudoephedrine. Pseudoephedrine has been proven to reduce milk supply by up to 20 percent.

Be careful when using phenylephrine, especially if you’re a mum who does not have a well-established milk supply.


Two clinicians speculated that breast milk exposure to acetaminophen during breastfeeding might be a risk factor for asthma and wheezing in the babies based on their personal experience and observations. However, their observations were not well-controlled and cannot be considered to be valid proof of side effects.

You should be careful when you take Dayquil while breastfeeding, especially if the formulation contains acetaminophen.


There are no well-qualified studies say that there are risks to your baby while you taking guaifenesin during breastfeeding. Weigh up the potential benefits and the potential risks before taking this medication while breastfeeding.


It is used during breastfeeding and it is considered safe.


dayquil while breastfeeding

Dayquil while breastfeeding

It is said that there are some medications that breastfeeding women should never consume. In the reality, however, most medications are compatible with breastfeeding.

For Dayquil, in most cases, the amount that transfers into milk can be very small. If you take Dayquil for long-term treatment and in high dose, you should talk to your doctors.

Personally I would avoid the Dayquil by myself. Although Dayquil is generally safe in the levels of which it gets into your breast milk but I was always told to avoid decongestants (Phenylephrine) because they are known to reduce milk production. Although there are website say there is no evidence that this particular type of decongestant reduces supply but I will never take the risks.

So is it safe to use Dayquil while breastfeeding ?

Breastfeeding mums might not like the answer: It depends on the dose and the formulations! It might be safe in breast milk, depending on the health, age of your baby. Talk to your doctors, a doctor can ease your concerns and tell you whether you can use Dayquil while you are breastfeeding.

However, there are some times when you should DEFINITELY NOT use these drugs.

  • You have had an allergic reaction to any of the active ingredients
  • You have high blood pressure, vessel disease, or rapid heartbeat
  • You have taken a monoamine oxidase inhibitor, furazolidone within two weeks.