First off, is there a reason for stopping it? The answer to that might well impact how you stop.

Other than that, I'd certainly taper down from your current dose over time as you've been taking it for so long, probably dropping by half for say 2-3 weeks, then possibly dropping alternate days for a few weeks before stopping.

Typically when changing dose it takes 10-14 days for the dose change to take effect, so don't change any quicker than this.

And watch out for potential changes relating to the dose decreases, which could be CH or something else, like your blood pressure may increase.

Do talk this through with your doctor too.