Phentermine Dosage Guidelines And Precautions

Phentermine is available in a 37.5mg dose, and this is the most common dose that is prescribed to patients. For some patients, their physician will instruct them to split the pill in half and take half of it before breakfast and the other half before lunch.



Usually, a single 37.5 mg or sometimes even the 30 mg tablet, is enough for one day’s effect. The effect of the drug is good for one day only, so you need not fear that it is TOO powerful. You can only take phentermine for a maximum of 12 weeks only so that you do not further endanger yourself from overdose. Besides, being a cousin of the amphetamines, it has the tendency to be addictive so you must only take the minimum dosage required at all times. Therefore, it is administered in either a 37.5mg full dose once a day or an 18.75 mg half dose twice a day. Doctors often prescribe the two half-doses to patients who have trouble controlling their appetite throughout the day. In these patients, taking a half dose twice a day may reduce their appetite more effectively, but it also carries with it an additional risk that they will be unable to get enough sleep at night. ​

Your doctor will specify the dosage when you are prescribed this drug, and will make a decision about the dosage based on a variety of factors. The exact impact of Phentermine 37.5mg in patients has been difficult to properly assess. Studies have been conducted of patients with obesity using a control group that was given a placebo. What this research indicates is that the benefits of Phentermine 37.5 are somewhat limited – a study conducted in 2006 in Korea found that the average weight loss difference gained from taking Phentermine was small, and typically between 5 and 10 percent. It is important to remember that this study was funded by a Korean pharmaceutical company and was intended to demonstrate the benefits of limited, short-term Phentermine usage.

​Symptoms of a Phentermine Overdose

In case you suspect that you are overdosing, watch out for the following symptoms: difficulty in breathing, very rapid pulse rate, cold sweating, signs of dehydration (sunken eyes, very dry skin, falling hair), extreme sleeplessness or constant insomnia, sever mood swings, excessive vomiting and an appearance of an allergic rash or hives.

If you see any of these symptoms, contact your physician immediately. Go to the emergency room and take lots of fluids with you to minimize dehydration. If the list of side effects scared you, there is a way to get the same positive effects of Phentermine without the scary side effects.

PhenObestin is the over the counter alternative to this. With no need for a prescription, you can buy it anywhere at anytime. This also means you can legally buy it from online stores and have it delivered straight to your doorstep.

  • Web MD - Phentermine Oral : Uses, Side Effects, Interactions, Pictures, Warnings and Dosing - WebMD.
  • - Phentermine: Drug Uses, Dosage and Side Effects -
  • - Phentermine for weight loss - Mayo Clinic.
  • Phentermine: MedlinePlus Drug Information
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(Last Updated On: 1st July 2022)