Phentermine is an appetite suppressant. It is in the family of amphetamine and phenethylamine.
When it is taken with exercise, diet, and behavioral modification and used short-term, it is approved to help obese patients reduce weight as an appetite suppressant. Most of the time it is prescribed for individuals who are at risk for medical problems associated with their weight. It works by releasing chemicals in the brain which control appetite.
Phentermine works on the hypothalamus portion of the brain. It helps reduce hunger by releasing a chemical messenger which signals a fight or flight response. Outside the brain Phentermine works to release adrenaline which causes fat cells to break down stored fat. A third thing it does is to release serotonin and dopamine, but it does in lesser amounts than that of adrenaline. The main thing Phentermine does is work inside the brain as an appetite suppressant.
The FDA has recommended that Phentermine be used only short-term, which means uninterrupted up to 12 weeks. Healthy dieting and exercise should also be followed while taking it, according to the FDA.
Patients should not use Phentermine if any of the following are true:
*an allergy to any ingredient in Phentermine
*are taken a monoamine oxidase inhibitor (MAOI) in the last 14 days
*have severe high blood pressure, an overactive thyroid, glaucoma, heart disease, blood vessel disease, severe narrowing of the blood vessels
*have a history of substance abuse
Some medical conditions can interact with Phentermine. People with the following conditions should consult with their physician before taking Phentermine:
*pregnant or are breast feeding
*are taking any type of dietary supplement
*allergies to medicines, foods, or other substances
*have a brain or spinal cord disorder
Phentermine can produce side effects like increased heart rate and elevated blood pressure. It can cause palpitations, restlessness, and insomnia in some patients. Psychological dependence on it has also been seen in a few people.
The most common side effects of Phentermine are: insomnia, hypertension, irritability, nervousness, dry mouth, heartburn, increased libido in females, confusion, diarrhea, headaches, nausea, psychosis, fatigue, and increased thirst. The less common side effects of this weight loss drug are: erectile dysfunction, fever, hallucinations, hostility, irregular blood pressure, overactive reflexes, restlessness, panic, constipation, weakness, periods of mania followed by depression, and convulsions.