The best answer to this question would be a firm NO. CBD has been proven to be a safe drug. It also lacks Tetrahydrocannabinol (THC), a component that has adverse effects if consumed in excess. This happens during the different extraction processes on the oil. CBD is also very unlikely to get you high as is the case with cannabis that contains THC. The oil has been legalized in many countries and states all over the world, a testament to the confidence most medical association have with it. Often, when taken as a prescription, it is a good idea to stick with the prescription given. However, if you occasionally exceed this prescription, there is no great risk. A few important things to note is if you are first time consumer of the product and tolerance. Although there are few risks of overdose, it is a good idea to stick to your recommended dose.