Your sister needs to complete her Antibiotics before flushing. Its generally advised not to use medications on the day of flushing, and Antibiotics need to be taken for their full course to be the most effective. A few days after finishing the medication will be an ideal time to flush and get their toxic residue out of the liver. It may take several flushes before there are noticeable improvements with allergies. Your sister might also want to consider doing a bowel cleanse, a kidney and even a parasite cleanse too. Some tumors are parasite related, kidneys can affect the back, and a clogged bowel can leave allergens in the system. Do the cleanses one or two at a time. Do not try to do it all at once and overwhelm the body.