Hi Lydia What parasite are you trying to kill?
I would hate to think that some information in my post would lead you to take meds not appropriate for you.
That said, I am specifically taking a combination of Iodoquinol and Doxycycline for entamoeba coli and dientamoeba fragilis. This is the treatment used by a Sydney clinic. Iodoquinol is an amebacide and doxycycline is an antibiotic. I am not sure if he is still using this combination of drugs any more. For further information you should contact jackie at www.badbugs.org
TC12 if you google: doxycycline zinc you will see there are thousands of links explaining that you must not combine doxycycline and zinc