Energy drinks have become popular in nightclub settings as mixer drinks and as a way of staying awake. Some people also combine alcohol and energy drinks, hoping that this will allow them to consume more alcohol without feeling intoxicated.
Mixing energy drinks with alcohol increases the risk of dehydration. Both caffeine and alcohol are diuretics (meaning they increase the production of urine). Combining these substances may cause drowsiness, loss of coordination and slower reflexes. These side-effects make it dangerous to drive a vehicle or operate machinery.
When energy drinks are combined with alcohol, it can be very difficult to judge how much alcohol has been consumed. This means that Blood Alcohol Concentration (BAC) continues to increase without the person realising it. It is an offence in Western Australia to drive with a BAC of 0.05% and over. Probationary ('P' plate) drivers are legally required to have a zero BAC when driving. Breaking this law carries penalties including disqualification from driving, fines and/or imprisonment.