Is the question we were left pondering after reading Jensen v. Walgreen Co., — P.3d —, 2025 WL 2799200 (Utah Oct. 2, 2025). It’s certainly a question that is answered in the affirmative in strict product liability prescription drug and device cases, as discussed here. And there is a certain logic to extending that reasoning to pharmacy cases. Sure, pharmacists play a crucial role in healthcare. But they’re not the prescribing authority — that’s the doctor. So, when it comes to whether a pharmacist should be held liable for failure to warn of a contraindication, shouldn’t the question be who had the final say in whether the patient got that medication? And if the answer is a confident learned intermediary, one who even if questioned by a pharmacist would still have ordered the prescription, doesn’t that defeat causation?
Plaintiff in Jensen suffered from severe chronic pain for which he was prescribed oxycodone for many years. The same doctor who prescribed oxycodone, also diagnosed plaintiff with anxiety and depression for which he prescribed clonazepam. The combination of the two drugs has been associated with severe respiratory side effects and in 2016 the FDA added a black box warning to both drugs warning of the risk. Id. at *1-2. When plaintiff filled the clonazepam prescription, the pharmacist received a warning on his computer about the combination with opioids, but the pharmacist overrode the warning and filled the prescription without calling the prescriber. Plaintiff died a few days later from “oxycodone clonazepam toxicity.” Id. at *2. On these facts, we can understand a court finding the pharmacist had a duty to act reasonably.
But that is not the end of the story. Two other key facts were established during discovery. First, at the appointment where the physician prescribed clonazepam, plaintiff and his wife both “expressed concern about adding clonazepam to [plaintiff’s] existing medications, and they specifically asked if it might case him side effects.” Id. The prescriber advised it would be fine. Second, the prescriber testified that even if the pharmacist had called him, “he would have instructed the pharmacist to fill the prescription exactly as written.” Id. When you add in these facts, we go back to our opening question: how can we reasonably say the pharmacist caused the harm.
The majority of the Jensen opinion focuses on the scope of the application of the learned intermediary doctrine to pharmacists under Utah law. Utah recognizes the learned intermediary rule as creating an exception to a pharmacist’s general “duty to possess and exercise the reasonable degree of skill, care, and knowledge that would be exercised by a reasonably prudent pharmacist in the same situation.” Id. at *6. Like most courts that have extended the learned intermediary doctrine to pharmacists, Utah agrees that the primary reason for not imposing a duty to warn on pharmacists is to prevent interference in the doctor-patient relationship. Id. at *7. However, Jensen goes on to hold that in negligence cases, there are circumstances where the exception does not apply. Namely, when the pharmacist is “aware of a patient-specific risk” or where the prescription contains an obvious error that a reasonably competent pharmacist would notice (like a lethal dosage). Id. at *6-7. In other words,
[W]hile the learned intermediary rule exempts pharmacists from the duty to warn patients of the general risks of FDA-approved drugs, outside of that, it does not create an exception to the general rule that a pharmacist owes a duty to care to patients.
Id. at *7. But the court also “emphasized” that in situations where the learned intermediary rule does not apply, “it does not necessarily follow that the pharmacist is liable for negligence.” Id. The plaintiff still needs to prove the other elements of a negligence claim—including causation.
So, while we agree that the learned intermediary doctrine, in this case, was not grounds for summary judgment as to the pharmacist’s duty, we disagree with the court’s conclusion that the prescriber’s testimony was insufficient for summary judgment on causation.
Because liability requires causation, the pharmacist’s action (or inaction) must have been a substantial factor in causing the injury. But if the doctor — the only one with the power to change or cancel the prescription — says they would have made the exact same decision even after being warned, then the pharmacist’s failure to warn didn’t change the outcome.
Holding the pharmacist liable in this kind of situation creates a double standard. It essentially punishes the pharmacist for not overriding a physician’s judgment, even when that judgment would have remained the same. In Jensen, it was undisputed that when asked about how clonazepam might interact with plaintiff’s other medications, the prescriber said it would be fine, and plaintiff went ahead and filled the prescription. Further, the prescribing physician testified unequivocally that if the issue had been re-raised by the pharmacist, the doctor would have reiterated his advice that the prescription was fine. This testimony breaks the chain of causation as a matter of law. No reasonable jury could find that the pharmacist’s alleged failure to warn caused the injury if the prescribing decision would have been the same.
Here, however, the court gave credence to plaintiff’s assertions that her husband would not have taken the drug had he been warned of the contraindication. But self-serving, hindsight drive statements should be insufficient to defeat summary judgment. In the context of a prescription drug, the key question should remain whether the physician’s prescribing decision would have changed. A plaintiff’s after-the-fact claim that they would have made a different decision should not rebut direct, unequivocal physician testimony. Particularly where the evidence demonstrates, as it does in Jensen, that plaintiff asked for the doctor’s opinion on drug interactions, accepted it, and took the drug. Where it is clear that the doctor’s advice would not have changed, it is likewise clear that the plaintiff’s actions would not have changed.
In short, the pharmacist might have had a duty to warn, but if that warning wouldn’t have changed a thing, then the failure didn’t cause the harm. No change, no causation. No causation, no liability. That’s how it should be.