Generic Name: phentermine
Brand Name(s): Ionamin
Medically reviewed by Ahmed Zayed, MD on June 19, 2018

Obesity is estimated to contribute to approximately 3.4 million deaths each year. The global prevalence of obesity is continuously increasing significantly. Obesity among men rose from 28.8% in 1980 to 36.9% in 2013. The prevalence among women increased from 29.8% to 38.0% in the last three decades1.

Numerous pharmaceutical drugs have been developed in recent years to address the widespread of obesity. Ionamin is one of the more recent options that have been approved by the FDA2 and provides an effective approach to the reducing of weight in obese patients. Physicians are increasingly turning to Ionamin to provide their patients with an effective way of reducing their body weight and reducing the hazardous impacts of obesity on their physiological and psychological health.

What Is Ionamin?

Ionamin is one of the many brand names available for the pharmaceutical drug phentermine. Phentermine is classified as a central acting anti-obesity agent that causes physiological effects that leads to more effective weight loss. This drug only takes advantage of phentermine HCI to suppress the appetite of the patient. With binge eating being one of the most important factors contributing to weight gain3 in the general population, the main working action of this drug helps to eliminate this factor to speed up weight loss and to avoid further weight gain.

Ionamin is not a drug that offers a patient a “magic” or “push-button” solution to weight loss. While this product has been proven highly effective in treating obesity, the use of the drug alone does not offer considerable results. Patients are advised to implement a number of lifestyle modifications while using this drug to achieve the expected results.

For successful results, a patient needs to implement a low-carb diet into their lifestyle that consists of healthy food choices and avoid the consumption of foods that are high in any content that may lead to excessive weight gain, such as refined sugars and oils, as well as unhealthy fats. In addition to diet improvements, a patient also needs to incorporate an effective training program into their daily life to ensure they burn off excess calories. The only way a patient can achieve successful weight loss is through the exertion of more calories than they consume on any given day4.

Prescribing And Dosage Details

A physician will determine the best dosage for a patient based on their current weight, as well as a variety of other factors. In most cases, a patient will be given a daily dose of 37.5mg. Patients are usually advised to take the drug approximately one to two hours before they have breakfast. Since phentermine is a stimulant, it should be noted that some patients may rather be given an 18.75mg daily dose of Ionamin. This is because certain patients may experience sensitivity to the phentermine due to its stimulant activity within the patient’s body.

Safety Information And Possible Side-Effects

When a physician decides to provide a patient with Ionamin to assist with reducing their body weight and reducing the impact of obesity on their health, a patient should ensure they mention certain facts to the physician. In particular, patients with hypertension, kidney dysfunction or diabetes need to ensure their physician is aware of these conditions. Allergic reactions may also develop, which makes it essential for a patient to ensure they are not allergic to the phentermine ingredient before they take this drug.

The primary ingredient of this prescription drug is also known to cause a number of different side-effects. Possible side-effects that a patient may develop include tiredness, weakness, dizziness, swelling in the leg or ankle, as well as pressure and pain in the chest area. Other common side-effects associated with Ionamin include an increase in blood pressure levels, a faster heart rate, the development of a rash, tremors, and sleeping difficulties. Gastrointestinal symptoms, such as diarrhea or constipation, may also develop.

Another vital factor to consider the use of Ionamin is the fact that this medication is known to cause a person to become dependent on it – leading to addiction. Thus, long-term use of this drug is not suggested. Should longer-term use be required, the patient will need to take breaks after certain periods of time.

Women who are pregnant and women who wish to become pregnant in the near future need to discuss this with their doctor before they use this prescription drug for obesity. This drug has been linked to many potential complications during pregnancy, including harm to the baby and possible birth defects.

Ionamin Interactions

The phentermine found in Ionamin is known to interact with certain medications and supplements. Patients are advised to discuss the use of multivitamin supplements, herbal extracts, and over-the-counter drugs with their physician before they start taking this prescription drug.  This will help the physician determine if the patient will need to make changes to the supplements or medication they are currently taking to avoid potential interactions occurring.

Numerous prescription drugs have also been associated with interactions between the use of drugs that contain phentermine. These drugs include insulin, paroxetine, sertraline, fluvoxamine, guanethidine, hypoglycemic medication, monoamine oxidase inhibitors, and fluoxetine. When a patient is already taking any of these medications, their physician may suggest a change in current dosage or a switch to a different type of medication.


Prescription drugs are becoming increasingly popular in the healthcare industry, providing physicians a way to assist their obese patients in relieving the damage that their excess weight causes. The use of Ionamin offers an effective approach to weight loss through appetite suppression. Unfortunately, the active ingredient in Ionamin has been associated with possible complications and side-effects.

Alternative options are available, with PhenterPro being one of the top similar products that can be purchased without the need for a prescription from a physician. This product offers an effective way to suppress appetite and boost energy levels without having to be concerned about possible adverse effects developing.


1 Multiple Authors. Global, regional and national prevalence of overweight and obesity in children and adults 1980-2013: A systematic analysis. Europe PubMed Central. 29 May 2014.

2 Ionamin Capsules (phentermine resin). Food and Drug Administration.

3 Multiple Authors. Body Satisfaction, Weight Gain, and Binge Eating Among Overweight Adolescent Girls. HHS Public Access. 8 May 2012.

4 J.S. Volek, J.L. Vanheest, C.E. Forsythe. Diet and exercise for weight loss: a review of current issues. U.S. National Library of Medicine. 2005.


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