Should lidocaine routinely be used to prevent pain on propofol injection during induction of general anaesthesia or sedation?

Anaesthetists commonly debate whether lidocaine should be added to propofol for anaesthetic induction. The benefits include pain relief and improved patient satisfaction, but disadvantages include the effect on the emulsion itself, the efficacy of propofol once it has been mixed, and the effect on growth of bacteria in the syringe.