Gadolinium is a heavy metal. Sounds ominous. But it is also the active component in contrast agents used in more than 100 million MRI procedures — and its accumulated safety record is, in the words of plaintiff’s own literature, “extraordinarily positive.” Combs v. Bayer AG, 2026 WL 1693470, at *11 n.19 (Okla. App. Ct. May 11, 2026). But that didn’t stop plaintiff from arguing that gadolinium retention causes a condition known as Gadolinium Deposition Disease (GDD) and that defendants failed to warn her of that risk. The Oklahoma appellate court’s affirmance of defendants’ summary judgment win is a welcome addition to the body of decisions finding those claims preempted. It also has some Oklahoma law bonuses worth noting.
Plaintiff received an injection of a gadolinium-based contrast agent (GBCA) manufactured by defendants in March 2016, as part of an MRI following a motor vehicle accident. After her injection, she experienced a wide range of symptoms she attributed to gadolinium retention in her body, including hives, migraines, muscle pain, swelling, and vision injury. She also eventually alleged she developed GDD. Id. at *1.
The crux of her case was that the FDA-approved warning for the GBCA addressed the risk of gadolinium retention only in patients with kidney disease — specifically, the risk of developing nephrogenic systemic fibrosis (NSF). Plaintiff had no kidney disease. The warning she wanted — one addressing the risk to patients with normal renal function — was not an FDA-approved warning. Id. at *2. So, plaintiff needed the CBE regulation to save her. It didn’t.
As regular readers of this blog know well, failure-to-warn claims brought against prescription drug manufacturers are preempted unless the manufacturer could have unilaterally changed its label under the Changes Being Effected (CBE) regulation. And the CBE has teeth: it requires newly acquired information showing reasonable evidence of a causal association between the drug and the alleged harm. Id. at *5.
What did plaintiff offer? First, she showed that the FDA was aware of gadolinium retention before her injection by pointing to adverse event reports. Adverse event reports alone do not establish a causal association. We have said this many times. And, as the court found, “[plaintiff] provided nothing to demonstrate that reasonable evidence of a causal association between [GBCAs] and these events existed before her injection.” Id. at *6.
Next, she argued that because gadolinium is “toxic” and is retained in the body, that was enough to trigger a CBE label change. But neither the toxicity nor the retention was newly acquired evidence and they certainly were not evidence of any causal association. Id. at *7. Knowing a substance is retained in the body is not the same as knowing that retention causes clinical harm. That’s basic science. It is also the CBE standard.
Plaintiff also tried to undermine the FDA’s own conclusions. In 2017 and 2018, the FDA conducted a multi-year review of the literature on gadolinium retention. The agency found no direct link to adverse health effects in patients with normal kidney function. In 2018, the FDA approved a revised label stating precisely that: “clinical consequences of gadolinium retention have not been established in patients with normal renal function.” Id. at *7. Even though those events took place after plaintiff’s injection, they supported defendants’ argument that no newly acquired evidence existed in 2016 to allow a unilateral label change. Id. If it didn’t exist in 2018, it certainly didn’t exist in 2016. Rather than reckon with the FDA’s conclusions, plaintiff argued the FDA’s analysis was “tainted” by defendants’ influence. She provided no evidence of this. Id. And — as courts have repeatedly recognized, and as we have pointed out in numerous posts — attacking FDA decision-making through state court litigation is exactly what Buckman Co. v. Plaintiffs’ Legal Committee, 531 U.S. 341 (2001), prohibits. Plaintiff offered no evidence of newly acquired information pre-2016 that would have allowed defendants to change the label, so the court affirmed summary judgment on the grounds of preemption. Id.
Preemption alone was sufficient to end this case, but the court also addressed two additional, independent grounds for summary judgment.
First, Oklahoma law provides a statutory rebuttable presumption that a manufacturer is not liable for harm caused by a product that complied with mandatory federal safety standards at the time of manufacture. 76 O.S. 2021, § 57.2(A). Defendants’ GBCA was FDA-approved, so the presumption was established. To rebut it, plaintiff needed to show either that the federal standards were inadequate or that defendants withheld information from or misrepresented information to the FDA. She argued neither on summary judgment. Those arguments were therefore waived. Id. at *8. But the court went further: even reaching the merits, what plaintiff offered was not evidence of fraud or inadequacy. It was, in the court’s pointed description, “hyperbolic speculation” about defendants’ motives. Id. at *11 n.7. That is not how you rebut a statutory presumption.
Plaintiff also tried a creative path around the presumption entirely. Section 57.2(D) of Oklahoma’s statute provides that the presumption does not apply when a product has been withdrawn from the market pursuant to an order or agreement with “any federal agency.” Id. at *9. Plaintiff pointed to the European Medicines Agency’s 2018 decision to suspend sale of the drug. The argument: if a “federal” agency — even a foreign one — takes action, the presumption evaporates. The court did not take long with this. “Federal agency” in the context of Oklahoma law means a federal agency of the United States of America. “We see nothing in the statute that signals an intent of the Oklahoma Legislature to defer to the judgment of the EU or its agencies.” Id. at *9. We see nothing either.
Plaintiff’s failure-to-warn claims also failed on causation under the learned intermediary doctrine. Plaintiff’s prescribing physician provided clear and consistent testimony in 2024: gadolinium retention from GBCAs does not cause clinical consequences in patients with normal renal function; GBCAs do not cause long-term negative symptoms in such patients; and — the pivotal question — knowing everything he knows today about the risks of retained gadolinium, he would not have changed his treatment. Id. at *10. That is exactly the kind of testimony that satisfies defendants’ burden on learned intermediary causation. The burden shifted to plaintiff to discredit her physician or show the undisclosed risk was sufficiently high that it would have altered his decision. She could not. The physician’s own answers said the opposite. Id.
Three grounds. All affirmed. Gadolinium may stay in the body. These claims should not.






