Efficacious, but inexpensive? That will never work for the folks at big Pharma...
If it works, it must be prohibitively expensive (/sarc).
The problem with the cynic’s views of “Big Pharma” and “doctors” are that Heparin is never used for long, nor is Lovenox.
Aspirin, esp. the baby kind, has been recommended for decades now as anti-coag for any of us at risk on a daily basis.