Gse and doxy?

Hi guys! Am taking doxycycline along with other herbal things but wondered is it safe to take grape fruit seed extract an hour before the doxy? Have read it prevents the doxy from working but would taking it away from the doxy matter

[JackieCalifornia]

I'd check with your doctor about all supplements and vitamins you are taking, and then also check with your pharmacist ("chemist" in the UK).  

Here in the US, the pharmacists often know much more about medication conflicts than the MDs do.