CVS Health , which runs the largest U.S. pharmacy benefit manager, will not add Gilead Sciences' new HIV prevention drug to its commercial plans for now, a spokesperson told Reuters, despite the medicine's proven effectiveness.

Gilead Needs Insurers to Cover New HIV Prevention Shot. CVS Isn’t Paying. Executives at Gilead Sciences, the biotech behind a long list of HIV treatments and preventative medicines, have spoken with great optimism in recent weeks about the prospects that insurers will cover Yeztugo, their new HIV prevention shot .

CVS Health will not cover Gilead's Yeztugo, generic name lenacapavir (LEN), citing "clinical, financial, and regulatory factors."