Also known as:learned intermediaries · learned intermediary doctrine · learned intermediary rule
Written by attorneys · grounded in primary & secondary sources — see below
A products-liability doctrine under which a prescription-drug or medical-device manufacturer fulfills its duty to warn by providing adequate information about risks to the prescribing physician rather than directly to the patient. The physician's professional judgment in selecting and monitoring treatment severs the causal link between manufacturer and patient unless the warning to the physician was inadequate or misleading. Causation requires proof that a different warning would have changed the physician's prescribing decision.
Sources & Authorities
How it applies
Common Examples
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Physician Receives Full Warning
Luna Lang visited her physician complaining of severe migraines. The physician reviewed the detailed risk information supplied by Lotus Pharmaceuticals for its new migraine medication and, after weighing the benefits against the documented stroke risk, prescribed the drug. Luna later suffered a stroke and sued Lotus for failure to warn. Because the manufacturer had adequately informed the physician, the physician's independent judgment broke the causal chain and Lotus incurred no liability.
Duty Satisfied Through Physician
Liam Larson received a prescription for a blood-pressure medication manufactured by Linden Bank’s pharmaceutical division. The company had supplied the prescribing physician with comprehensive warnings about potential kidney damage. When Liam developed kidney failure, he sued the manufacturer directly for inadequate warnings. The manufacturer satisfied its duty by warning the physician, so no liability attached for failure to warn the patient.
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Cases
Casebooks
Dictionaries
Causation Requires Changed Decision
Lucia Lopez underwent surgery after her physician implanted a medical device made by Lakeshore Industries. The company had warned the physician of a known fracture risk. Lucia later suffered a device fracture and sued, offering only general evidence that physicians knew of device risks. Because she could not show that a different warning would have altered her physician’s decision, the learned-intermediary rule defeated her claim.
Common questions
Frequently Asked
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Does the learned intermediary doctrine apply to medical devices as well as prescription drugs?+
Yes. Florida courts and the Eleventh Circuit have applied the doctrine to medical-device manufacturers, holding that the duty to warn runs to the prescribing physician rather than the patient.
Supporting sources
What must a plaintiff prove to overcome the learned intermediary doctrine on causation grounds?+
A plaintiff must show that an adequate warning to the physician would have changed the physician’s prescribing decision. Generalized evidence that physicians were already aware of risks is insufficient.
Supporting sources
When is a manufacturer still liable even if it warned the physician?+
Liability remains if the warning given to the physician was inadequate or misleading, because the physician’s independent judgment cannot break the causal chain when the information supplied was defective.
Supporting sources
676 N.W.2d 268 (Minn. 2004)Torts
…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…
TortsProducts liability based on the design, manufacture, and distribution of products and defenses to such claims · Products liability based on the design, manufacture, and distribution of products and defenses to such claimsNEXTGENIntermediate