Have a 17-year-old taking bactrim sulfamethoxazole tmp wondering if there will be any drug interaction if she takes an herbal allergy pill that i got at the health food center that has vitamin a , c, pantothenic acid , calcium , zinc, quercetin, n-acety

Probably OK, but...: I doubt there is any serious potential for an adverse interaction. However, one of the problems with "natural" medicines, herbal products, and nutritional supplements, etc is that their exact contents often are unknown, And even when known, there is little research on interations with other drugs. So hard to be certain -- but probably no problem.