This is a different expert and I have a different answer for you.
Amoxicillin alone is not a good choice for diverticulitis, particularly since you are being treated on an outpatient basis.
I think you mean amoxicillin/clavalunate or augmentin. This is the drug of choice, twice a day.
Or, cipro can replace it.
If you are not rapidly showing improvement [48 hours plus], then you need in patient treatment.
Your question states both that you are on the amoxicillin twice a day, and then it states you are taking it 3 times a day. Which is it?
The correct regiment is augmentin twice a day.
If you have fever or any complications after several doses, IV antibiotics should be considered. At age 82, outpatient treatment is more problematic, so follow closely with your doctor.
I am a double board certified US doctor.
Dr. thomas. Find me daily in medical by request for fast and accurate answers.
Please click a positive on this answer page if you would like me to get paid by just answer.
Find me anytime.