The mechanism of action is similar to that of cocaine or amphetamine – it is not for nothing that methylphenidate is considered a ‘speed substitute’ in the drug scene. The tablets are usually taken orally, snorted as a powder, or dissolved in water and injected. The energizing and stimulating effect lasts for around four hours. During this time, performance and concentration are increased, while the body loses the ability to perceive exhaustion or overexertion.