Also known as: learned intermediary rules · learned-intermediary rule · learned intermediary doctrine
Written by attorneys · grounded in primary & secondary sources — see below
A doctrine providing that a prescription drug or medical device manufacturer fulfills its duty to warn by adequately informing the prescribing physician of the product's risks rather than warning the patient directly. The physician acts as a learned intermediary who evaluates risks and benefits for the individual patient and decides what information to convey. The manufacturer avoids liability for failure to warn the patient when its warnings to the physician are adequate and not misleading.
Lillian Locke received a prescription for a new medication from her physician. The drug manufacturer had sent the physician detailed materials describing the risk of a rare but serious side effect. After Locke suffered the side effect, she sued the manufacturer for failure to warn. Because the manufacturer had properly warned the physician, the physician's independent judgment broke any causal link to the patient.
Layla Lane underwent treatment with a prescription drug whose manufacturer had supplied comprehensive risk information to her prescribing physician. Lane later claimed the manufacturer should have warned her directly about a known adverse reaction. The manufacturer satisfied its obligation by warning the physician, who was positioned to assess Lane's specific medical needs and decide how to communicate the risks.
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Lucia Lopez received an implanted medical device after her physician reviewed the manufacturer's warnings about potential complications. Lopez sued the manufacturer, alleging inadequate warnings, but offered only general evidence that physicians knew of the risks. She could not show that a different warning would have altered her physician's prescribing decision, so the manufacturer escaped liability under the doctrine.
Yes. Courts applying Florida law have held that a medical device manufacturer's duty to warn runs to the prescribing physician rather than the patient, just as with prescription drugs.
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A plaintiff must show that an inadequate warning to the physician would have changed the physician's prescribing decision. Generalized evidence that physicians were aware of risks is insufficient.
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The manufacturer loses protection when its warnings to the physician are inadequate or misleading. In that situation the physician's judgment does not break the causal chain to the patient.
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Physicians are viewed as best positioned to evaluate the risks and benefits of a medication or device for each individual patient and to decide what information to convey.
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…instructions on ways to safely use the product to avoid injury. Carole A. Cheney, Comment: Not Just for Doctors: Applying the Learned Intermediary Doctrine to the Relationship Between Chemical Manufacturers, Industrial Employers, and Employees , 85 Nw. U.L. Rev. 562, 566 (1991). See Hodder v. Goodyear Tire & Rubber Co. , 426 N.W.2d 826, 834…