Anything in the tetracycline family should work as others have been documented also . Doxy is suggested because of its longer half life . Others I have helped used amoxicillin and others in this family of tetracyclines . One thing I notice is the people that use tetracycline products have faster healing rates than those that don't. I took doxy for a long time , I just had a full blood count along with DNA testing and I am in perfect health according to test results . I haven't had a symptom since spring and feel great . I continue to worm monthly and even did a run of doxy after a kidney infection developed (which I had many times during treatment ) .