Phentermine Side Effects

​Phentermine is a prescription drug that is prescribed to patients who are having trouble losing excess weight and whose weight is a risk factor for their overall health.



​Phentermine 37.5 is generally prescribed to be taken in the morning either before or after a healthy and well rounded breakfast. This is due to the stimulant properties of this amphetamine drug. If taken later in the day, it may cause difficulty falling asleep and/or staying asleep throughout the night. It is recommended that this medication is taken at least ten to fourteen hours before bedtime to ensure that the stimulant effects do not interfere with your ability to get a good night’s rest, which is very important for overall health and keeping stress levels down. We have all likely heard that stress increases cortisol production in our bodies, and cortisol can lead to excess weight and fat gain. However, for some, dosage may vary and certain individuals need to take smaller doses throughout the day. Your physician will be able to determine what is the best and safest methods and doses for you, but remember to communicate with your doctor and/or pharmacist and he or she will be able to help with any side effects you may be experiencing due to the drug schedule or dosage amounts.

Speaking of side effects, let’s review some of the side effects that can come along with Phentermine 37.5. While these are usually rare, side effects can include:

  1. Dizziness
  2. Dry mouth
  3. Difficulty getting to sleep and staying asleep
  4. Nausea
  5. Vomiting
  6. Constipation
  7. Diarrhea
  8. Raised blood pressure

​As mentioned above, these side effects are rare. However if you experience any of these side effects, it is pertinent that you communicate these with your doctor and pharmacist.

You may simply need a change in dosage, but it may also be the case that Phentermine is unsafe for you. If any of these side effects last for a lengthened period of time, it is advised to discontinue use immediately and see your doctor.

For those who are unable to take Phentermine 37.5 due to unwanted side effects or danger to overall health, there are many other options to aid in your weight loss pursuits.

Even rarer than the above side effects, these serious side effects may occur. If you experience any of the following, call your doctor immediately:

  1. Fast, irregular, or pounding heartbeat
  2. Cognitive changes or changes in mood (agitation, anger, hallucinations, nervousness)
  3. Uncontrolled muscle movements
  4. Change in sexual ability and/or interest
  5. Severe headache
  6. Slurred speech
  7. Seizure
  8. Weakness on one side of the body
  9. Visual changes (blurry vision)
  10. Chest pain
  11. Difficulty breathing during physical activity
  12. Decreased ability to exercise
  13. Fainting
  14. Swelling of legs
  15. Swelling of ankles
  16. Swelling of feet
  17. Rash
  18. Itching
  19. Swelling (especially in face, tongue, or throat)
  20. Severe dizziness
  21. Trouble breathing

While lifestyle changes are absolutely necessary including diet and exercise, you can try any of the variety of dietary supplements that are available over the counter.

One available alternative to Phentermine 37.5 is PhenObestin, which is an all natural neutraceutical that has been reported by many to aid in achieving their weight loss goals. It comes in a 37.5 mg dosage just like Phentermine, but consists of over the counter ingredients that you can purchase without a prescription. As with any dietary supplement or significant lifestyle change, consult with your physician before adding PhenObestin to your weight loss routine. Best of luck to you in your weight loss journey! You can do it!

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