Two old political foes will unite to kickstart the debate about expanding Sydney's lone medically supervised drug consumption centre to new areas and new ways to help users of the drug ice.

Nearly two decades since a summit inspired by a Sun-Herald story led to an overhaul of NSW drug policy, former premier Bob Carr and opposition leader John Brogden will address a second summit at State Parliament next month.

Labor MP Bob Carr backs trials of new approaches to pill testing and ice consumption rooms. Credit:Alex Ellinghausen

The 1999 summit, held against the backdrop of a heroin epidemic, led to the highly controversial supervised medical injecting centre in Kings Cross.

Next month's summit, the initiative of a group of MPs from across political divides, will consider how a harm-minimisation approach could be extended to today's major drug challenges, including the rising availability and use of ice.