Each phentermine hydrochloride capsule contains phentermine hydrochloride, 30 mg (equivalent to 24 mg Phentermine). Phentermine Hydrochloride is a white crystalline powder, very soluble in water and alcohol. Chemically, the product is phenyl-tertiary-butylamine hydrochloride. Inactive Ingredients: F D & C Blue 1, Methylcellulose, Polyethylene Glycol, Starch, Titanium Dioxide, Sucrose and Invert Sugar. The branding ink used on the gelatin capsules contains: Ethyl Alcohol, F D & C Blue 1 Aluminum Lake, Isopropyl Alcohol, n-Butyl Alcohol, Propylene Glycol, Pharmaceutical Shellac (modified) or Refined Shellac (Food Grade).

Weight loss varies depending on how long the medication is taken by the person. A review of research shows that using:one phentermine tablet or capsule 15 to 30 mg of phentermine daily resulted in about 1 lbto 13 lb more weight loss than when using a placebo. The medication was used from 2 weeks to 24 weeks, with an average use of about 13 weeks. Most of the people using phentermine in the studies reviewed also made lifestyle changes, such as diet or exercise.

Like many other prescription drugs, work with neurotransmitters in the brain. Phentermine stimulates neuron bundles to release a particular group of neurotransmitters known as catecholamines; these include dopamine, epinephrine (formally known as adrenalin), and norepinephrine (noradrenalin). They signal a fight-or-flight response in your body which, in turn, puts a halt to the hunger signal. As a result, you lose your appetite because your brain doesn't receive the hunger message. This is perhaps due to phentermine's affects on leptin levels in the brain. It is theorized that phentermine can raise levels of leptin which signal satiety. It is also theorized that increased levels of the catecholamines are partially responsible for halting another chemical messenger known as neuropeptide Y. This chemical initiates eating, decreases energy expenditure, and increases fat storage.