Botox injections are usually safe when you're under the care of a licensed and skilled health care provider. The procedure can result in unwanted results or even cause harm if it's given incorrectly. Botox definition : 1. a brand name for a substance that is injected (= put in through a needle) into the skin in order…. Learn more. Learn about uses, side effects, and more about Botox (onabotulinumtoxinA). It’s a prescription injection used for several conditions, including migraine. Botox meaning : 1. a brand name for a substance that is injected (= put in through a needle) into the skin in order…. Learn more.