The DXM has great potential and, if not for my "slow" metabolism, I'd have a glowing report on it. Unfortunately I am forced to spend time experimenting with various dosing strategies.
If I take a qtr tsp I do very well the first, not so well the second, and have problems the third day as system levels increase. So I am trying different schedules as well as alternating with mucuna and ginger which seem to have similar effects in small doses.
More on my blog.