Jesus I can't imagine how constipated you must be after a week.
yes, thats an unfortunate side effect.
I just chuck it in a glass with water (it doesn't mix well, but you can kinda drink it), then add more water to the leftover shit in the glass, swirl around to get everything and chug that down too, followed by more water for the taste, it tastes like sucking a teabag...
10-15g is a nuts dose for most people (me included), unless you have a high opiate tollerance.
It is also handy for addiction treatment by occupying the opiate receptors, reducing pleasure from opiates.