Yes!
I always get sick on every vacation. I took it faithfully before, during and after (not necessarily every 3 hours) and I didn't get sick. We were gone for 2-1/2 weeks.
Everytime I get a scratchy throat, it becomes a sinus infection or bronchitis. I got one and started taking the airborne every 3 hours. The scratchy throat came and went for a couple of weeks, but that was it, no bronchitis, no sinus infection.
I will always have this on hand from now on.