The rebates given to pharmacy benefit managers to secure a drug’s place on the formulary have become a difficult barrier to coverage for new products. The rebate income for these PBMs is sometimes passed on to health plans, insurers, and employer purchasers, but more often it is not.
A big issue is that managed care organizations tend to become addicted to millions of dollars in rebate “income,” and this mindset prevents serious consideration of new medications at competitive costs.
For biosimilars, Pfizer and Merck have had a difficult time dislodging Janssen, maker of Remicade®, from its preferred formulary position, despite lower prices based on wholesale acquisition cost (WAC). Janssen has simply matched the net cost (through increasing rebates), while keeping its WAC costs high—tempting plans with ever-increasing rebate revenue. The health plans don’t see the benefit of incurring the administrative costs of moving masses of patients from the preferred product to a new one, or seeing this revenue stream interrupted, without an overall further improvement in net costs.
Managed care plans have long said that discounts of 25% or more will be necessary to release the rebate stranglehold of preferred products. In the case of infliximab, this has not yet occurred, based on recent minor inroads made by Merck’s Renflexis® biosimilar, despite larger discounts. Until greater competition is available, which drives down the WAC prices (and then average sales prices [ASPs]), barriers to accessing new medications will remain. In fact, when competition does increase, makers of the originator products, like Janssen, can simply ratchet up their rebates to maintain a hold on sales (and a billion-dollar plus profit).
Perhaps the best way around this is to force a change in the marketbasket. This can be accomplished in a couple of ways. The first, by instituting separate tiers for biosimilars and reference agents, takes the biosimilars out of the 1 of 2 preferred drug contracting restrictions, and allows patients to access biosimilars as well as preferred brands.
A second way is to reconsider biologic agents according to indication-based contracts or mechanism-of-action (MOA) based differences. Therefore, the marketbasket is modified to consider anti-TNFs separate from interleukins, allowing preferred agents in each separate category. This would allow, for instance, for more effective psoriasis agents to be well covered, and maintain the preferred position of Humira® and Enbrel® for appropriate patients.
A third way is to work out some innovative value-based contract, in which the manufacturer and health plan/insurer reaches an agreement on (usually) the expected outcomes of drug use and additional rebates or performance guarantees if the medication fails to deliver on this performance. The most important consideration in this agreement is the practicality of measuring an outcome of interest or ensuring adherence.
The rebate trap seems to be ensnaring more manufacturers of new biologics and biosimilars. Without greater consideration of the overall good, this trap can cause systematic problems for the pharmaceutical industry and discourage drug innovation and accessibility.
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