Interesting. I had read about potential issues with Ritonavir and other medications, but (as I recall) the issues were raised by Merck which made me wonder if it was exaggerated.
Based on some google searching, it appears to me that the number of drugs that could interact with Ritonavir is quite large (608 according to the drugs.com website)(drugs.com also lists 5 disease interactions).
633 medications are known to interact with ritonavir. Includes amlodipine, prednisone, atorvastatin.
Of these, 213 are listed as "major" drug interactions, and 354 are listed as "moderate":
633 drugs are known to interact with ritonavir.
More google searching for most common prescriptions suggests that (as of 2019) quite a few of major and moderate drugs are very commonly prescribed:
The 300 most common medications on the outpatient market -- the top 300 of 2020
According to the website above, there are 24.5 million people in the U.S. taking Atorvastatin alone, which is in the major drug interaction category according to drugs.com.
This is completely outside of my wheelhouse, so I have no idea how difficult it will be to manage all of these potential interactions.