Identification

• Phentermine comes in the form of a white tablet that is odorless and water soluble.
  
  

Active Ingredient

• The active ingredient is phentermine hydrochloride, which helps stimulate weight loss in obese patients.
  
  

Function

• Phentermine elevates your blood pressure and stimulates your nervous system in order to increase your metabolism. According to drugs.com, Phentermine should not be taken for more than three weeks, as adverse effects can develop.
  
  

Warning

• According to drugs.com, Phentermine may take weeks to work. Do not use it for longer than prescribed and do not increase the dosage. Serious side effects have been reported, including primary pulmonary hypertension and valvular heart disease.
  
  

Inactive Ingredients

• The inactive ingredients in Phentermine include lactose monohydrate, colloidal silicon dioxide, pregelatinized starch, magnesium stearate and microcrystalline cellulose.