Boxed warning problems for physicians
There is no reliable mechanism for manufacturers or the FDA to communicate boxed warnings directly to physicians, so it’s not clear how physicians are expected to stay informed about the issuance or revision of boxed warnings. They may first learn about new or revised warnings in the mass media, which is paying ever-increasing attention to press releases from the FDA. However, it can be difficult for the media to accurately convey the subtle and complex nature of a boxed warning in nontechnical terms.
Many physicians subscribe to various medical news alerts and attend continuing medical education (CME) programs, which often do an excellent job of highlighting new warnings, while hospitals, clinics, and pharmacies may broadcast news about boxed warnings in newsletters or other notices. But these notifications are ephemeral and may be missed by physicians who are overwhelmed by email, notices, newsletters, and CME programs.
The warnings that pop up in electronic medical records systems are often so numerous that physicians become trained to ignore them. Printed advertisements in professional journals must include mandated boxed warnings, but their visibility is waning as physicians increasingly read journals online.
Another conundrum is how to inform the public about boxed warnings.
Manufacturers are prohibited from direct-to-consumer advertising of drugs with boxed warnings, although the warnings are easily found on the Internet. Some patients expect and welcome detailed information from their physicians, so it’s a good policy to always and repeatedly review this information with them, especially if they are members of an identified risk group. However, that policy may be counterproductive if it dissuades anxious patients from needed therapy despite risk-benefit considerations that strongly favor it. Boxed warnings are well known to have “spillover effects” in which the aspersions cast by a boxed warning for a relatively small subgroup of patients causes use of a drug to decline among all patients.
Compounding this conundrum is that physicians rarely have sufficient information to gauge the magnitude of a risk, given that boxed warnings are often based on information from surveillance systems that cannot accurately quantify the risk or even establish a causal relationship. The text of a boxed warning generally does not provide the information needed for evidence-based clinical practice such as a quantitative estimate of effect, information about source and trustworthiness of the evidence, and guidance on implementation. For these and other reasons, FDA policies about various boxed warnings have been the target of significant criticism.
Medication guides are one mechanism to address the challenge of informing patients about the risks of drugs they are taking. FDA-approved medication guides are available for most drugs dispensed as outpatient prescriptions, they’re written in plain language for the consumer, and they include paraphrased versions of any boxed warning. Ideally, patients review these guides with their physicians or pharmacists, but the guides may be lengthy and raise questions that may not be answerable (e.g., about incidence rates). Patients may decline to review this information when a drug is prescribed or dispensed, and they may discard printed copies given to them without reading.