Jury is Out on Possible Effects of CVS/Aetna Merger-Could result in fewer choices for Aetna enrollees, observers say

If the proposed $69-billion purchase of health insurer Aetna by CVS — a pharmacy chain that is also a pharmacy benefit manager (PBM) — is approved, it may be good news for the companies involved, but its potential effects on patients and providers are not so clear, experts say.