One of the most common problems when taking medications is their side effects. This is the negative effect of medications that people try to stay out for. Because of this, medicines like phentermine have an advantage in the market. This is a supplement for diet and weight loss. People buy phentermine because it is said to give no side effect. Since it is a generic brand, this diet supplement is also cheaper than other competitions. The fact that it can be bought without prescription also makes it more accessible to consumers.