, also known as coke, is a strong stimulant mostly used as a recreational drug. It is commonly snorted, inhaled as smoke, or dissolved and injected into a vein.Mental effects may include loss of with reality, an intense feeling of happiness, or agitation.sical symptoms may include a fast heart rate, sweating, and large pupils.High doses can result in very high blood pressure or body temperature.Effects begin within seconds to minutes of use and last between five and ninety minutes. has a small of accepted medical uses such as numbing and decreasing bleeding during nasal surgery