I think it would be best to get one of the books that the featured experts on this forum have written and understand the whole process of Liver Cleansing. The Liver Flush is only one step in cleansing the body and is best done after doing the preparations. Your father would need to understand the process and know that before he feels better he may go through periods when he feels worse as the toxins begin to be cleared out. Since he is also on meds he would need to have regular appointments with a Dr. in case the doses need to be adjusted as often happens as a person regains their health.