Concerning measures to reduce prescription drug costs, and, in connection therewith, creating the “Colorado Prescription Drug Cost Reduction Act of 2019” to require health insurers, prescription drug manufacturers, pharmacy benefit management firms, and nonprofit organizations to report specified information about the costs of prescription drugs to the commissioner of insurance; to direct the commissioner to analyze the information and submit a report regarding the effects of prescription drug costs on health insurance premiums; to preclude pharmacy benefit management firms from retroactively reducing payments to pharmacies; and to require carriers to reduce consumer cost sharing for prescription drugs to reflect rebates the carrier or pharmacy benefit management firm received.