Phentermine is well known cure for obesity. Moreover, Phentermine is the general name, but medicines can be called differently for example Adipex-P, Fastin, Ionamin, Obenix, Obephen, Oby-Cap, Oby-Trim, Panshape M, Phentercot, Phentride, Pro-Fast HS, Pro-Fast SA, Pro-Fast SR, Teramine, and Zantryl. Phentermine can be taken for long or short time. An individual diet, exercises and other changes in life will surely stronger the effects of drug. It works by limiting the appetite. It changes the serotonin levels in brains by influencing neurotransmitters’ metabolism. These neurotransmitters are called catecholamine and include norepinephrine, epinephrine and dopamine. They stop information for the brain about hunger. The FDA recommends this medicine, however specialists suggest that it should be taken up to 12 weeks. The combination with healthy food and exercise is very good for losing weight. Chemical structure of Phentermine is close to the amphetamines, which is very addictive substance. According to this fact, the sale of phentermine is controlled in some countries. After 12 weeks, there is a possibility of addictiveness. Phentermine does not work so effective like it was before. There were some researches, for example people taking this drug 36 weeks and did not noticed any positive effect. There are some rules about taking the pills of Phentermine. It should be taken on empty stomach, once or twice a day, but never in the evening. The doctors suggest taking it before breakfast or 1-2 hours after breakfast and enable easier developing of insomnia. Moreover, you must not destroy orpills. Phentermine is quite well-tolerated drug. Even thought it there may occur some side effects. One of them is increased heart beat rate of over 100 beats per minute. Other symptoms are restlessness, blurred vision, dizziness, tiredness. When taking longer this medicine with amphetamines, it may lead to psychological addiction and euphoria. You should be careful when driving or operating machines. While finishing the treatment, there should be some slow and gradual steps taken. They will help to steady weight loss. As the consequence of stopping the treatment, there may occur some side effects. There may be some symptoms for example an allergic reaction, which includes breathing difficulties, throat closing or hives, swelling of the lips, face or tongue. What’s more, there may be headaches, high blood pressure, irregular heartbeat, confusion, hallucinations, or abnormal behavior. In that kind of situation, contact as soon as possible with your doctor.