Phentermine nausea affects about 7% of patients, and can range from a mild annoyance to debilitating discomfort . It has different etiologies, but this phentermine side effect most often strikes in the first few days or weeks of treatment. Most cases of stomach upset resolve on their own with at-home management, but contact a doctor if your phentermine nausea proves severe, progresses to vomiting or continues for more than 2-3 days.
Phentermine and other stimulants cause nausea for a variety of reasons. Patients’ phentermine nausea may be related to the medication itself, or hunger pains associated with decreased appetite. Either way, nausea can have a major impact on your quality of life, so it is important to address the issue as soon as possible.
Phentermine nausea may be related to:
Nausea and vomiting are listed side effects of phentermine, as well other stimulant medications like Ritalin and Adderall. Phentermine is thought to function via central nervous system (CNS) activation, triggering a response similar to “fight or flight”. One unfortunate consequence of this reaction is nausea, or even vomiting . The cascade of physical, hormonal and emotional changes associated with this heightened state precipitate nausea, partially because of slowed digestion and food staying in the stomach for longer [3,4]. If you experience nausea after eating on phentermine, this is a likely culprit. Food stuck in the stomach proves a common cause of both heartburn and nausea in adults.
Growing overly-hungry can also lead to phentermine nausea, especially if you have diabetes . Queasiness is a common symptom of low blood sugar, which can happen if you are eating too little or too infrequently. Since phentermine acts as a powerful appetite suppressant, users sometimes forget to eat – or choose to dramatically decrease intake – and experience low blood sugars as a result.
More, phentermine may affect your need for diabetes medications.
Dehydration can also cause nausea. Your cells need water to function properly and when cells in the stomach cannot produce proteins they need they sense something is wrong and stop working, which makes you feel nauseous .
Taking medications or supplements on an empty stomach can cause nausea and vomiting, especially if you have a sensitive stomach. When you take a medicine, supplement or vitamin, it irritates your stomach. As a result, taking phentermine first thing in the morning or long after breakfast can cause phentermine nausea.
Finally, phentermine nausea can be a sign of an adverse drug reaction or allergy.
If your phentermine nausea comes-on suddenly, proves severe or is accompanied by other worrisome symptoms, contact a doctor or seek medical attention right away.
Phentermine nausea strikes most patients in the first week or two of treatment and lasts for anywhere from a few hours to a few days. If you have mild to moderate phentermine nausea, try these common remedies to reduce queasiness.
One of the most common causes of nausea, with or without phentermine, is dehydration. If you have phentermine nausea and you have been skimping on water, drink 1-2 big glasses of water and wait 20 minutes. Sometimes this is all you need make quell the stomach upset.
Prevent the return of this unpleasant sensation by drinking at least 8-10 glasses of water per day. If you feel thirsty, get dizzy or produce dark yellow urine, you are already dehydrated . Urine color is the best at-home indicator of proper hydration, with pale yellow proving optimal.
Another common contributor to phentermine nausea is diet. Eating too much spicy, fried, high-fat or high-fiber food can make stomach problems worse, as candrinking too much caffeine or alcohol . While food does not generally cause nausea, it can make it worse if you are already feeling queasy from the medication.
Interestingly, some evidence suggests that the morning meal is especially important in controlling nausea throughout the day. Eating a high-protein breakfast seems to control nausea better than a sugary meal just after waking up . The good news? Breakfasts with at least 30g of protein have been proven beneficial for weight loss as well .
After your first meal, aim to eat something light every 4-6 hours while awake to avoid growing overly hungry or full, both which can exacerbate stomach problems. Try to finish your last meal at least 2-3 hours before bed to reduce nocturnal acid reflux and related phentermine nausea.
Another option is to try natural antiemetics – such as ginger, peppermint or lemon – to reduce nausea.
Ginger is one of the most well-known and well-studied homeopathic remedies for nausea and vomiting. The root proves an effective treatment for nausea of different causes, and has been scientifically proven to reduce nausea related to sea sickness, motion sickness and chemotherapy-induced nausea . Sniffing peppermint or lemon essential oils may also help alleviate nausea, as could the foods themselves. Aromatherapy with either of these oils has been shown decrease nausea, but the most common form of consumption is as a drink . Peppermint tea or water with a slice of lemon are effective, at-home treatments for phentermine nausea.
One possibility may be to decrease, spilt or otherwise adjust your dose of phentermine. If phentermine itself is making you nauseous, discuss this option with your prescribing doctor. You should NEVER adjust your dose or schedule without speaking to a medical professional first. He or she can also answer questions about which medications you can take to manage phentermine nausea.
2. LaCount, L. T., Barbieri, R., Park, K., Kim, J., Brown, E. N., Kuo, B., & Napadow, V. (2011). Static and dynamic autonomic response with increasing nausea perception. Aviation, Space and Environmental Medicine, 82(4), 424-433. PMCID: PMC3137518
5. American Diabetes Association. (2018, August 29). Hypoglycemia (Low Blood Glucose). Retrieved from http://www.diabetes.org/living-with-diabetes/treatment-and-care/blood-glucose-control/hypoglycemia-low-blood.html
6. U.S. Food and Drug Administration. (2012). Adipex-P (phentermine hydrochloride) capsules label [Brochure]. Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/label/2012/085128s065lbl.pdf
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