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Phentermine and Adipex are both classified as appetite suppressants, with the latter the brand version of the former. While they have their similarities, as each is used for appetite suppression and fast weight loss, it’s important to note the differences. Both drugs are taken orally.

Let’s take a closer look at Phentermine and Adipex:

Phentermine Hydrochloride

Both diet pills contain Phentermine hydrochloride, an active compound that causes chemical changes to the nervous system via the hypothalamus, or the brain’s “appetite center.”

Prescription Medication

Phentermine and Adipex are prescription medications that require physician approval before administration. No reputable doctor will prescribe either drug without a thorough consultation first.

Drug Formulation

Adipex is available in 37.5 mg formulation only, while generic Phentermine is available in a range of doses/strengths. This is because Phentermine is manufactured by a variety of drug companies. Ingredients differ slightly for the same reason, which may affect how the drugs are absorbed by the body.

Old and New

Phentermine is the older of the two drugs, and therefore has seen greater usage. Phentermine is also the more popular version due to dosage level options among other reasons.

Side Effects

Potential side effects from Phentermine and Adipex are essentially the same due to their active ingredient. These include headache, dry mouth, dizziness, increased blood pressure, and rapid heart rate.


Keep in mind that the effectiveness of your chosen pill depends on the dosage level, so talk to Dr. James Koijan of today about your weight loss goals. He’ll set up an initial consultation to determine if you’re a Phentermine 37.5 candidate, and will provide a free appetite-suppressing food list with your order to further help your weight loss efforts.

For more on services available through this premier Phentermine doctor, please contact today.

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Attention DrToHelp Patients

We want to thank you for your trust and business with, over the last 10 years! However, due to State and Federal laws, we no longer will be able to ship actual pills to you starting December 1, 2023. From this date on, we will only be able to send an electronic prescription to your pharmacy of choice, for you to go directly to your pharmacy to pick up your Phentermine pills there at your own pharmacy. 

We also will not be taking any NEW patients in Georgia, Indiana, Michigan, New York, Pennsylvania and Nebraska for the next 1-3 months.