I believe that it is not legal in the US to purchase filler products from a pharmacy. It can only be purchased by a physician from the manufacturer directly.
Restylane is a popular in dermal filler. It's popularity comes from the dramatic results that are possible when used appropriately and the immediate onset of action. As you have noticed on this board however it is possible to have complications and unsatisfactory results with Restylane. These can be largely avoided by only working with a board-certified plastic surgeon or dermatologist who has great deal of experience with this filler. In our practice, we see many patients who have received dermal fillers by unexperienced doctors or nurses and present with difficult problems.