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.
If you are 70 years or over and have had two normal Pap smears in the last five years, you do not have to keep having Pap smears, unless you wish to do so. Women who are over 70 years who have never had a Pap smear, or those who request a Pap smear, of course could have a pap smear. Remember that, with the advent of HPV testing that goes along with the papsmear test, women over the age of 30 need only to have a pap with HPV every 3 years, if both of negative.