Is it safe to take gravol (dimenhydrinate) or ibuprofen while taking tetracycline?

Gravol? Dimenh....? I studied substance abuse among nj high schools students in newark in late 60's when maryjane, heroine, lsd were rampant, and interestingly alcohol was by far still the most abused drug. It never ceases to amaze me the creativity of youth to come up w new poisons of choice. What a world this may be if that youthful, hyperkinetic schizoid angst---guys, i'm talkin' to you--were re-directed!