Pregabalin is a controlled substance not available to buy over the counter and can only be legally obtained through a prescription from a doctor. However, like many prescription medications, pregabalin is often sold illegally online or by street dealers. Because it is a schedule 3 controlled substance, you can be prosecuted for having it without a prescription. It is also illegal to sell, and what may be sold as pregabalin online could be any substance as there is no way to control what is being made.