answered Feb 03, 2010 at 12:35PM
I am not familiar with Vegetal Silica?
It would depend on what this product contains- any stimulants (caffeine, ephedra & others) &/or diuretics, or sodium, could present problems.
If this is a vegetable fiber product- than fiber taken with the pressure Rxs, may change the effect, by changing absorption, of the meds.
Hope this helps.
Doc