Party pills are designed to boost energy levels and mood for parties through natural ingredients. They contain stimulants like BZP, TFMPP, cocoa bromine, cayenne, and L-phenylalanine that are claimed to induce feelings of happiness and energy in a similar way to illegal drugs but without negative side effects. Manufacturers say party pills were developed as a safer alternative to reduce illegal drug use at events. However, critics argue the pills are still controversial due to questions around their ingredients and effects.