Therefore, we cannot assume that the PPA is the direct cause of these side effects. So it is safe to assume that these companies selling these drugs are not going to print literature on trials that they fund that poses their product as a risk to the consumer. Therefore, it is quite likely that these studies might be skewed or biased. Basically, PPA is an extremely controversial drug. Countless studies have been done on its effectiveness and safety.
Some studies claim that the drug works well to lose an initial amount of weight.
But after discontinued use, the weight is likely to come right back on. Some studies claim that an initial amount of weight is lost and then PPA has no effect on additional weight loss. Almost every single study is somewhat biased. Many use a specific type of subject and not a randomized group of people. Also, in almost all studies, the individuals are overweight and want to lose weight.