Can you take Phentermine while Breastfeeding? (Does it effect breast milk)

  • By: jacob foxx
  • Date: April 14, 2023
Can you take Phentermine while Breastfeeding?

For many new mothers, postnatal weight loss is a top priority. However, it’s important to be mindful of potential risks when considering weight-loss aids like phentermine.

While this medication is known to be effective, there is no scientific evidence that proves its safety for breastfeeding mothers.

Given that phentermine can pose certain risks even for individuals without nursing responsibilities, taking it while breastfeeding could potentially result in more severe side effects for both mother and child. 

This article will educate you on how phentermine may impact your breast milk and address any questions you may have about its safety and efficacy during breastfeeding.

So, without further ado, let’s get started.

Does phentermine affect breast milk?

Phentermine is a drug that has been shown to affect breast milk production, but limited research is available on its specific effects.

However, studies on amphetamine, which has similar pharmacological and chemical properties, have shown that it also affects breast milk production.

While amphetamine is a more potent stimulant, both drugs have the potential to appear in breast milk, even in small or safe amounts.

Therefore, it’s important for nursing mothers to consult with their healthcare provider before taking phentermine or any medication.

They can help weigh the importance of the drug to the mother’s health and its possible effects on her breast milk and nursing baby. Taking this precaution can ensure the safety and health of both the mother and child.

Although amphetamines like methamphetamine can be secreted in breast milk, there is a lack of evidence on the specific effects of phentermine on nursing mothers.

However, it is important to note that phentermine is contraindicated during pregnancy and breastfeeding.

Furthermore, a combination of phentermine and topiramate has been categorized as FDA-X due to its potential to cause fetal abnormalities and miscarriages in both animals and humans.

While studies suggest that amphetamines do not adversely affect established lactation, they may suppress serum prolactin and affect the breastfeeding ability of mothers whose lactation is not established.

Therefore, experts discourage their use among nursing mothers. It is worth noting that phentermine has been shown to have an average weight loss potential of 5 lbs per week with a 37.5-mg dose, but caution should be taken when considering its use in breastfeeding mothers.

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How long can I breastfeed after taking phentermine?

Breastfeeding mothers may have concerns about the safety of taking medications that could potentially pass into their breast milk.

This is particularly pertinent for phentermine and topiramate, which have been found in breast milk, but there is a lack of research quantifying the secretion of phentermine alone.

Thorough research and awareness of potential risks are key for mothers.

It is recommended to wait at least 24-36 hours after taking any drugs or medicines before nursing their child, while with recreational amphetamines, withholding breastfeeding for 48 hours is advised.

Dr. Anil recommends waiting at least one week before breastfeeding after taking Phentermine, given its half-life of 16–31 hours and the fact that it may take 3.5–6.5 days to be completely eliminated from the body. 

What if you use phentermine while breastfeeding?

For new mothers struggling to maintain a healthy weight while breastfeeding, Phentermine may appear to be an appealing option to suppress appetite.

However, it is important to consider the potential risks and unknowns associated with this medication.

Rapid weight loss could potentially impact milk supply, which could negatively affect both mother and baby.

Phentermine may appear in breast milk, but there is no clear understanding of its safety or concentration at this time. 

Breastfeeding Can Aid with Weight Loss

Breastfeeding has been known to offer numerous benefits to both the mother and the child, including a smaller waistline.

While the first few weeks or months may not exhibit significant weight loss, studies have shown that exclusive breastfeeding for 3 months has a small effect on weight loss among US women.

This can be attributed to hormones released during breastfeeding that cause contractions in the uterus, resulting in a slimmer belly.

Mothers who breastfeed are also known to retain less weight at 6 months postpartum. Research has also revealed that half of all breastfeeding mothers feel that their body benefits from breastfeeding.

An epidemiological study conducted among Mexican American women found that those who breastfed had lower weight and depression scores at 6 months postpartum compared to those who did not breastfeed.

These findings suggest that breastfeeding has significant benefits, including weight loss and improved mental health.

Can you take any weight loss pills while breastfeeding?

Breastfeeding has many benefits, one of which is the ability to burn calories. However, nursing mothers require additional calories, around 330-400 kcal per day, according to the CDC.

While losing weight may be a priority, doctors advise against using weight-loss pills due to potential harm to the nursing baby.

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The good news is that there are safe options for shedding those unwanted pounds while breastfeeding, such as exercising, sticking to a low-carb diet, keeping well hydrated, and getting adequate rest.

If weight-loss pills seem like the only option, there are some safe picks available, such as the all-in-one postnatal fat burner, Brilliant Garcinia Cambogia, ProbioSlim, Envy nighttime fat burner, and Plexus Block. 


When it comes to weight loss while breastfeeding, it’s important to consider the safety of both the mother and the baby.

Despite its popularity as an appetite suppressant, there is a lack of scientific studies and user experience regarding the use of phentermine while nursing.

Breastfeeding itself can naturally aid in weight loss and should not be hastened with potentially harmful substances.

It’s also worth noting that being either overweight or underweight can affect milk supply, so any weight loss pills should only be taken upon the recommendation of a doctor.

While it may be tempting to slim down quickly, the health and well-being of both mother and child should always be a top priority.

I'm Jacob Foxx, a proud native of the outskirts of Chicago, Illinois. I was enamored with the expansive Star Trek universe and its promise of cutting-edge technology and space travel from a young age. This early fascination with science fiction sparked my imagination and laid the foundation for my writing career. Alongside my love for the cosmos, I developed a passion for fitness in my formative years.

This dual interest in the world of tomorrow and the pursuit of physical health has greatly informed my writing, allowing me to explore themes of human potential and the future of our species. As an author, I strive to blend these passions into compelling narratives that inspire readers to dream and to push their own boundaries.

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