Rifaximin (Xifaxan) is an expensive drug used to treat traveler's diarrhea and irritable bowel syndrome with diarrhea. It is also used to prevent hepatic encephalopathy, a brain disorder that can occur due to severe liver disease. This drug is more popular than comparable drugs. There are currently no generic alternatives to Xifaxan.
I recommend to patients over age 50thst they consider doing Pap smears every three years. If they are over age 65 with no history of cervical cancer can stop having Pap smears. Women without a cervix and no previous history of cervical cancer can stop having Pap smears done following a hysterectomy. So, to answer your question, I would advise a 73 year old woman in good health with no prior history of cervical cancer and low risk factors for STD infection to stop having Pap smears.
It is recommended that all women get a Pap smear done within 3 years of becoming sexually active or by age 21. Pap smears should be done every year for at least 3 years, and if they are all normal, your health care provider may change your Pap smear schedule to every 2-3 years.