In addition to buying only from established online stores, it’s also important to look for quality brands or those that you already know work for you. The most important thing is that they work and that they’re safe. For prescription medications, consult your doctor first before switching brands. In some cases, you might not have other options because there’s only one manufacturer that makes the specific formulation that you need. Don’t immediately buy an alternative online; get the opinion of a qualified health professional before anything else.