Is there a negative effect if I take garcinia cambodia whilst taking thyroxine, minoxidil and spironolactone?

Disappointment. Yes. of course. Disappointment and the sadness that comes when one finds out they were duped into paying for a fake or false product that promises the moon and will never deliver. This product, like most that have come before it, will not in any way lead you to real or lasting weight loss.