They do have a moderate success for some people. However, after six months, statistics show weight loss in the range of 18-20 pounds on the average, and typically, further progress as a result of the drug is minimal. Water intoxication rarely occurs. The exception is in extreme climactic conditions. For example, in Arizona where the temperature is 110 in the summer, a heavy workout with lots of sweating will result in excessive perspiration.
Perspiration is salty water, but people tend to drink back regular water.
In this case, the blood might be diluted. Should this occur, symptoms of water intoxication can develop. However, this is VERY rare and adding a quarter teaspoon of salt to a gallon of water, or just normally lightly salting food can prevent the imbalance of salt to water from occurring. Six to eight cups of water or fluid a day is generally recommended. If you are exercising regularly you might want to add two to four cups additional water to your day.