Although phentermine pills are oral suppressants that help in reducing weight, they must be taken only as part of a normal diet plan and not alone. Phentermine, when taken by itself for weight reduction, might cause severe side effects and complications and so the usage must be with caution only.

Even when phentermine pills are taken along with a diet plan, there are side effects, such as dry mouth, insomnia, irritability, stomach upset or constipation until the body adjusts to the medication. These might disappear in time but it's good practice to inform the physician if they persist for long.

Diet, smoking, sleeping and alcohol habits need to be changed for the medicine to take effect as well as preventing side effects which could lead to severe complications.

Before taking phentermine pills as part of diet consult your physician to discuss medical history as well as details and history of existing diseases and medications-even cold medicine.

Phentermine is not recommended for children or pregnant women. Consulting a physician would eliminate any doubt regarding the use of Phentermine. There can be severe side effects such as chest pain, nervousness, pounding heart, difficulty urinating, mood changes, breathing difficulties or swelling are experienced during use of Phentermine, consult a physician immediately as this might indicate that the body is unable to adjust to the medication.

The mood changes associated with phentermine are very similar to those associated with amphetemines, commonly known as ""speed"" or ""uppers"". They produce erratic behavior and manic bouts of energy and enthusiasm, but lead to major emotional crashes in many cases. Be up front with your physician about any side effects, no matter how trivial they may seem to you at the time.