Unopened properly stored Promethazine w/cod dating back to 2004

[roldi]

I found and unopened bottle of Promethazine w/ cod 6 ounces, now the discard date reads 2004 lol, that's 10 years old, but its completely unoppened any tips? thanks in advance :D, poured up a 2 ounce it just doesnt look to mucky like purple lean, its got a brown look to it can that just be from the aging? tastes a tad off aswell, think there might be any toxicity's metabolized?