Also known as Doxycycline Hyclate. Coverage in Puerto Rico (CMS PDP Region 38).
Not on any stand-alone Part D formulary in Puerto Rico
None of the 3 stand-alone Part D (PDP) plans in CMS PDP Region 38 list this drug. On one of those plans the patient would pay the full retail price, or you would need a formulary exception.
Medicare Advantage plans
Medicare Advantage plans carry their own formularies, separate from stand-alone Part D, and are sold county by county. Pick a county to see every Medicare Advantage drug plan there that covers this drug.
No Medicare Advantage drug plan in PR lists it either