What Monitary Policy Should Do in a Low Inflation Regime?

In a low inflation regime, monitary policy can actually afford to be more flexible. This is because it has to act more vigorously in order to get a given result. And that can increase the side effects of very large movements in interest rates. If you wait too long, inflation may be quite hard to stop. Once it becomes entrenched, the costs of bringing it down are much higher. What should central banks do when inflation risks moving from a lowflation regime into a high inflation regime? Central banks would need to act in a very timely and decisive way.