In the last few months, we have discussed two decisions rejecting claims made by plaintiffs in prescription medical product liability litigation that medical device manufacturers somehow had a duty to warn about claimed risks that occurred when their products were used (by physicians, of course) in conjunction with some other product. In Silverstein v. Coolsculpting – Zeltiq Aesthetics, Inc., 2025 N.Y. App. Div. Lexis 1118 (N.Y. App. Div. Feb. 27, 2025), discussed here, a plaintiff claimed unsuccessfully that a device manufacturer had a duty to warn about the risks of a different product (ice packs) that physicians may, or may not, choose to use during the patient’s recovery period.
[U]nder New York law, the manufacturer of a product has a duty to warn of the danger arising from the known and reasonably foreseeable use of its product in combination with a third-party product which, as a matter of design, mechanics or economic necessity, is necessary to enable the manufacturer’s product to function as intended. . . . [T]he ice packs were not necessary in any way for the . . . device to function as intended. Indeed, the device functioned without incorporating ice packs, and the ice packs were not included as supplies with the . . . device.
Id. at *2-3 (citations and quotation marks omitted).
A little earlier, in Lin v. Solta Medical, Inc., ___ F. Supp.3d ___, 2021 U.S. Dist. Lexis 228901 (N.D. Cal. Dec. 18, 2024), discussed here, a plaintiff lost an argument that a medical device manufacturer had to warn about “enhanced” risks that only arose when the defendant’s device was used in conjunction with a second device made by someone else. However, a defendant “cannot be liable for a product it did not manufacture, control, or create.” Id. at *7.
[T]here is no warning specifically about greater risk when a different medical device [is also used]. Plaintiff argues that failing to specifically warn that another medical device . . . enhances the risk of injury constituted a failure to adequately warn. . . . But plaintiff asks too much by proposing that defendant must warn with specificity about every conceivable element that might enhance the [risk of injury].
Id. at *24 (emphasis original).
These two cases demonstrate that plaintiffs regularly attempt (fortunately, without much success) to impose on prescription medical product manufacturers expansive duties to warn about the products of other manufacturers that, presumably, are judgment proof or otherwise difficult to sue. Similar attempts, with similar motivations, are reflected in the economically absurd, and largely rejected, “innovator liability” theory that would require branded drug manufacturers to warn about risks of competing generic products (immunized by preemption). See, e.g., our Innovator Liability Scorecard. An earlier example, that thankfully seems to have largely run its course, is “market share liability,” which would create industry-wide warning liability in situations where plaintiffs couldn’t prove which manufacturers’ drug they took. A 50-state survey of ours from 2010 hasn’t changed much, except for Wisconsin having since abolished the theory through legislation. See Wis. Code §895.046(3-4) (added in 2011).
To counter the continuing threat of non-manufacturer warning liability, we offer the following discussion of the law.
We start in our sandbox, with prescription medical product liability litigation. As our scorecard demonstrates, courts overwhelmingly reject attempts to create the “innovator liability” form non-manufacturer prescription drug warning liability. In Huck v. Wyeth, Inc., the Iowa Supreme Court cautioned:
It may well be foreseeable that competitors will mimic a product design or label. But, we decline [plaintiff’s] invitation to step onto the slippery slope of imposing … liability on manufacturers for harm caused by a competitor’s product. Where would such liability stop?
850 N.W.2d 353, 380 (Iowa 2014) (citation omitted). Similarly, McNair v. Johnson & Johnson, 818 S.E.2d 852 (W. Va. 2018), held:
[W]hile our law states that manufacturers are subject to the duty to warn about the risks of their products, the generic drug in this case is not a product of the brand manufacturer. Consequently, brand manufacturers cannot be held strictly liable for failure to warn of another manufacturer’s product.
Id. at 861. Liability for other manufacturers’ products “stretches foreseeability too far.” McNair, 818 S.E.2d at 862. For convenience, here is a current list of all other appellate authority rejecting innovator liability (see the Scorecard for trial level decisions). Forest Laboratories, LLC v. Feheley, 296 So.3d 302, 315 (Ala. 2019) (a “manufacturer cannot be held liable for injury caused by a product it did not manufacture”); Rafferty v. Merck & Co., 92 N.E.3d 1205, 1213 (Mass. 2018) (“a manufacturer may be found liable for a failure to warn only where the product that caused the injury was made by that manufacturer”); Johnson v. Teva Pharmaceuticals USA, Inc., 758 F.3d 605, 614-15 (5th Cir. 2014) (applying Louisiana law); In re Darvocet, Darvon, & Propoxyphene Products Liability Litigation, 756 F.3d 917, 938, 941-54 (6th Cir. 2014) (applying the laws of 22 states); Eckhardt v. Qualitest Pharmaceuticals, Inc., 751 F.3d 674, 681 (5th Cir. 2014) (applying Texas law); Lashley v. Pfizer, Inc., 750 F.3d 470, 476-78 (5th Cir. 2014) (applying Mississippi & Texas law); Schrock v. Wyeth, Inc., 727 F.3d 1273, 1284 (10th Cir. 2013) (applying Oklahoma law); Fullington v. PLIVA, Inc., 720 F.3d 739, 744 (8th Cir. 2013) (applying Arkansas law); Guarino v. Wyeth, 719 F.3d 1245, 1251-53 (11th Cir. 2013) (applying Florida law); Smith v. Wyeth, Inc., 657 F.3d 420, 423-24 (6th Cir. 2011) (applying Kentucky law); Foster v. American Home Products Corp., 29 F.3d 165, 168-71 (4th Cir. 1994) (applying Maryland law); Moretti v. Wyeth, Inc., 579 F. Appx. 563, 564-65 (9th Cir. 2014) (applying Nevada law); PLIVA, Inc. v. Dement, 780 S.E.2d 735, 743 (Ga. App. 2015); Franzman v. Wyeth, Inc., 451 S.W.3d 676, 689-92 (Mo. App. 2014) (applying Kentucky law); Stanley v. Wyeth, Inc., 991 So.2d 31, 34-35 (La. App. 2008); Flynn v. American Home Products Corp., 627 N.W.2d 342, 350 (Minn. App. 2001). Only California has allowed innovator liability on anything less than intentional conduct. See T.H. v. Novartis Pharmaceuticals. Corp., 407 P.3d 18, 27- 40 (Cal. 2017).
Other prescription medical product cases have rejected non-manufacturer warning liability in the context of comparative warning claims. Yates v. Ortho-McNeil-Janssen Pharmaceuticals, Inc., 808 F.3d 281 (6th Cir. 2015) (applying New York law), held that drug manufacturers’ warning duties did not extend to allegedly lower risks of competing drugs. Warning duties existed only about a product’s own risks, “not to different drugs treating the same ailment.” Id. at 291-92. Earlier, Pluto v. Searle Laboratories, 690 N.E.2d 619 (Ill. App. 1997), rejected the same argument, finding no duty to warn about the comparative risks of “competing products”:
[Defendant] is under no duty to provide information on other products in the marketplace. Such a duty would require drug manufacturers to rely upon the representations made by competitor drug companies. This arrangement would only lead to greater liability on behalf of drug manufacturers that were required to vouch for the efficacy of a competitor’s product.
Id. at 621. Accord Nelson v. C.R. Bard, Inc., 553 F. Supp.3d 343, 355 (S.D. Miss. 2021) (refusing to take the “slippery slope” of requiring warnings “of danger compared with other products”), aff’d, 44 F.4th 277 (5th Cir. 2022). See Ackley v. Wyeth Laboratories, 919 F.2d 397, 405 (6th Cir. 1990) (manufacturer “not obligated to provide a comparison of its drug with others”) (applying Ohio law); Batoh v. McNeil-PPC, Inc., 167 F. Supp.3d 296, 314 (D. Conn. 2016) (defendant owed no duty to warn “about a product that it did not make or sell”); Adamson v. Ortho-McNeil Pharms., Inc., 463 F. Supp.2d 496, 504 (D.N.J. 2006) (“courts have routinely held that competitors have no duty to advertise or sell a competitor’s products”); Smith v. Wyeth Laboratories, Inc., 1986 U.S. Dist. Lexis 21331, at *28 (S.D.W. Va. Aug. 21, 1986) (“no authority for [plaintiffs’] argument that a drug manufacturer may be required to represent that other drugs with similar effects are safer”).
Additional medical product decisions rejecting non-manufacturer warning claims in other situations are: Johnson v. American Cyanamid Co., 718 P.2d 1318, 1326 (Kan. 1986) (rejecting claim that defendant “did not provide information on alternate vaccines”); Martinez v. Medical Depot, Inc., 434 F. Supp. 3d 537, 547 (S.D. Tex. 2020) (“no duty to warn or instruct about another manufacturer’s products, though those products might be used in connection with the manufacturer’s own products”) (citation and quotation marks omitted); Kapps v. Biosense Webster, Inc., 813 F. Supp.2d 1128, 1158 (D. Minn. 2011) (defendant “does not reprocess its own” devices; therefore no duty to warn of risks of third-party reprocessing); Doe v. Ortho-Clinical Diagnostics, Inc., 335 F. Supp.2d 614, 626-27 (M.D.N.C. 2004) (knowledge “that other manufacturers were copying [defendant’s] expired patent” did not create duty to warn).
Going outside our sandbox, we continue with the seemingly perpetual plague of asbestos litigation, which has turned to non-manufacturer warning liability as the funds of actual asbestos manufacturers were depleted by endless litigation and liability. In Air & Liquid Systems Corp. v. DeVries, 586 U.S. 446 (2019), the not-so-business-friendly Supreme Court allowed limited non-manufacturer warning liability in a maritime law case, while invoking “[m]aritime law’s longstanding solicitude for sailors.” Id. at 456. The limited duty in DeVries exists only “when: (i) a manufacturer directs that the part be incorporated; (ii) a manufacturer itself makes the product with a part that the manufacturer knows will require replacement with a similar part; or (iii) a product would be useless without the part.” Id. at 457 (internal citations omitted) (emphasis added). As exemplified by Silverstein, supra, that is not the type of situation likely to exist in prescription medical product liability litigation – but perhaps it could.
DeVries, however, was a maritime law case, and after it, most states have declined p-side invitations even to adopt its narrow form of non-manufacturer warning liability. The most prominent such decision is Coffman v. Armstrong International, Inc., 615 S.W.3d 888, 899 (Tenn. 2021), which held that, under Tennessee’s product liability statute, “manufacturers have no duty to warn with respect to products manufactured and sold by others.” Id. at 899.
[T]he best reading of the TPLA does not create a duty or liability for defendants for the post-sale incorporation of [other] products … after it left their control…. The TPLA specifically provides that a defendant shall not be liable under the TPLA unless the product is defective or unreasonably dangerous at the time it left the defendant’s control.
Id. at 895 (citation omitted).
Georgia has a similar product liability statute, also requiring the claimed product defect to have existed at the time the product was sold. Ga. Code §51-1-11(b)(1). Davis v. John Crane, Inc., 836 S.E.2d 577, 584 (Ga. App. 2019), thus concluded, like Coffman, that “foreseeability” of the product later being used with another manufacturer’s dangerous product was insufficient to create a warning duty:
Appellant seeks to expand the traditional duty to warn so as to require a manufacturer to warn of the hazards in another manufacturer’s product. This has never been the law in Georgia, and we decline to expand our case law in this respect.
Id. at 251 (emphasis original). For other appellate asbestos since our 2015 post on the so-called “bare metal” defense, see Beverage v. Alcoa, Inc., 975 N.W.2d 670, 688 (Iowa 2022) (“limit[ing] products liability claims against manufacturers or sellers to exposures from their own products” and barring “products liability claims premised on products or component parts made or sold by others”); Gillenwater v. Honeywell International, Inc., 996 N.E.2d 1179, 1200 (Ill. App. 2013) (“to impose liability [here] would violate a fundamental tenet of products-liability law: a manufacturer is responsible only for the defects in the products it manufactured”).
Significantly, quite a few other states have statutes containing the same defect-at-sale element as Tennessee and Georgia or otherwise explicitly defining “product liability” actions to confine liability to those who manufactured, distributed or were otherwise involved with the product that caused injury. See Ala. Code §6-5-530(a), Ariz. Rev. Stat. §12-681(5); Ark. Code §16-116-101; Colo. Rev. Stat. §13-21-401(2); Conn. Gen. Stat. §52-572n(a); Idaho Code §6-1402(1); Ind. Code §34- 20-1-1; Kan. Stat. §60-3302(a-c); La. Stat. §9:2800.52; Me. Rev. Stat. tit. 14, §221; Miss. Code §11-1-63; Mont. Code §27-1-719; N.C. Gen. Stat. §99B-1; N.D. Cent. Code §28-01.3-01; N.J. Stat. §2A:58C-2; Ohio Rev. Code §2307.71(13); Or. Rev. Stat. §30.900; S.C. Code §15-73-10 (codifying Restatement §402A); Tex. Civ. Prac. & Rem. Code §82.001(2); Utah Code §78B-6-703(1); Wash. Rev. Code §7.72.030(1); Wis. Stat. §895.046(3). Since, by definition, a product cannot be used in conjunction with some other product until after it has been sold, these statutes should also preclude non-manufacturer warning liability.
Numerous non-manufacturer liability claims have also been brought, and rejected, in litigation involving vehicle parts – cars, trucks, and assorted other self-propelled products. Decisions involving motorized vehicles have broadly rejected warning claims that ignore who made what. New York’s high court “decline[d]” to extend warning duties to tire manufacturers merely because they “produce[d] a sound product which is compatible for use with a defective product” made by someone else. Rastelli v. Goodyear Tire & Rubber Co., 591 N.E.2d 222, 225-26 (N.Y. 1992). Such liability for other products was inappropriate where the defendant “did not contribute to the alleged defect in [the other] product, had no control over it, and did not produce it.” Id. at 226 (citations omitted).
[Defendant] had no control over the production of the [other product], had no role in placing that [product] in the stream of commerce, and derived no benefit from its sale. [Defendant’s product] did not create the alleged defect in the [other product] that caused the [accident].
Id. Accord Hansen v. Honda Motor Co., 480 N.Y.S. 2d 244, 246 (N.Y. App. Div. 1984) (defect-at-sale requirement meant manufacturer had no duty to warn about subsequent modifications “however foreseeable such modifications may have been”).
Acoba v. General Tire, Inc., 986 P.2d 288, 304-05 (Haw. 1999), agreed with Rastelli that “a manufacturer owes a duty to warn regarding its own product, not regarding products it did not produce, sell, or control”) (emphasis original). Baughman v. Gen. Motors Corp., 780 F.2d 1131 (4th Cir. 1986) (applying South Carolina law), likewise found no “rationale for imposing liability” where “the defendant manufacturer did not incorporate the defective component part into its finished product and did not place the defective component into the stream of commerce.” Id. at 1132-33.
[Plaintiff’s] position would require a manufacturer to test all possible replacement parts made by any manufacturer to determine their safety and to warn against the use of certain replacement parts. If the law were to impose such a duty, the burden upon a manufacturer would be excessive.
Id. at 1133.
The Texas Supreme Court reached the same result in Firestone Steel Products Co. v. Barajas, 927 S.W.2d 608, 614 (Tex. 1996), holding that a manufacturer had no duty to warn regarding the product of another manufacturer that modified the defendant’s design. “A manufacturer generally does not have a duty to warn or instruct about another manufacturer’s products, even though a third party might use those products in connection with the manufacturer’s own product.” Id. at 614.
An earlier Texas decision, Walton v. Harnischfeger, 796 S.W.2d 225 (Tex. App. 1990), applied the same logic to a crane, holding “that a manufacturer does not have a duty to warn or instruct about another manufacturer’s products, even though those products might be used in connection with the manufacturer’s own product.” Id. at 226. “To require [a crane] manufacturer to warn of all . . . dangers would be unfair and unrealistic.” Id. That defendant “had no duty to warn or instruct users of its crane about [items] it did not manufacture, incorporate into its crane, or place into the stream of commerce.” Id. at 227.
Most recently, in Tennessee, an appellate court, guided by Coffman, supra, held that an auto parts manufacturer “did not have the legal duty . . . to warn about the misuse that arose from the combination of its product with the products of other manufacturers.” Woodruff v. Ford Motor Co., 2024 Tenn. App. Lexis 222, at *29 (Tenn. App. May 20, 2024), appeal pending.
Plaintiff claims that [defendant] had a duty to warn about the combined use of its [product] with another manufacturer’s product, . . . as opposed to a duty to warn about some intrinsic feature of the actual [product]. We find that Coffman’s explicit holding that “under the [Tennessee statute], manufacturers have no duty to warn with respect to products manufactured and sold by others” applies to the facts of this action.
Id. at *27. Accord Woodruff v. Ford Motor Co., 2024 Tenn. App. Lexis 229, at *23-24 (Tenn. App. May 28, 2024) (identical ruling with as to other manufacturer’s product).
Likewise, a vehicle manufacturer was not liable in Louisiana for injuries from a replacement part because the part “was not the one manufactured by [defendant]. It was a completely foreign device.” Landry v. E.A. Caldwell, Inc., 280 So. 2d 231, 235 (La. App. 1973). Accord Cousineau v. Ford Motor Co., 363 N.W.2d 721, 728 (Mich. App. 1985) (“Failure of a component not supplied by the manufacturer does not give rise to liability on the manufacturer’s part.”) (citation omitted).
Finally, non-manufacturer warning claims concerning a wide variety of other products products have failed. The law’s refusal to impose duties to warn about risks of other entities’ products extends broadly. Chemical manufacturers are not obligated to warn about any conceivable combination with other chemicals that might create injurious reactions.
[T]he manufacturer’s duty is restricted to warnings based on the characteristics of the manufacturer’s own product. Understandably, the law does not require a manufacturer to study and analyze the products of others and to warn users of risks of those products.
Powell v. Standard Brands Paint Co., 212 Cal. Rptr. 395, 398 (Cal. App. 1985) (citations omitted). A chemical manufacturer in Blackwell v. Phelps Dodge Corp., 203 Cal. Rptr. 706, 710 (Cal. App. 1984), likewise had no duty to warn about risks created by storage containers it did not make. “The product alleged to have been dangerous, and hence defective, for lack of warnings and instructions was not the [chemical] supplied by defendant, but the tank car in which the [chemical] was shipped.” Id. at 710.
A paint manufacturer in Johnson v. Jones-Blair Paint Co., 607 S.W.2d 305 (Tex. App. 1980), had no duty to warn about the flammability of third-party products used to clean spilled paint, although spills and spatters are inevitable occurrences.
[T]he product (paint) is not unreasonably dangerous in the absence of the warning urged by plaintiffs. The dried paint spots did not explode. The explosion resulted from the use of a product (gasoline) supplied by a seller other than [defendant].
Id. at 306. Accord Drake-Willock International, Ltd., 530 N.W.2d 510, 515 (Mich. App. 1995) (“recommend[ing]” a cleaning method created no duty to warn, since “manufacturers d[o] not have a duty to provide warnings for dangerous conditions present in other products”).
Nor must a glass bottle maker warn about a product (the bottle cap) that it did not produce. The defendant in Andry v. Canada Dry Corp., 355 So.2d 639, 641 (La. App. 1978), was “responsible for only one component” − the bottle − and the plaintiff offered “no evidence that the bottle involved in this case, which was the only component manufactured by the defendant . . ., malfunctioned in any way.” Id. at 641.
Rejection of non-manufacturer warning duties is also preclusive in scaffolding cases. “We have never held a manufacturer liable … for failure to warn of risks created solely in the use or misuse of the product of another manufacturer.” Mitchell v. Sky Climber, Inc., 487 N.E.2d 1374, 1376 (Mass. 1986). A scaffold manufacturer had no “foreseeability”-based duty to warn about flooring planks made by others. “[W]e emphasize [defendant] did not supply the ‘defective’ product.” “Pennsylvania law does not permit” liability for not “warn[ing] of dangers inherent in [a product] that it did not supply.” Toth v. Economy Forms Corp., 571 A.2d 420, 422-23 (Pa. Super. 1990).
In Baker v. Poolservice Co., 636 S.E.2d 360, 365 (Va. 2006), the duty to warn “ha[d] no application . . . because [defendant] was not the manufacturer of the [hot tub] or any of its component parts.” A manufacturer of an “off-the-shelf” product “ha[s] no duty to warn [plaintiff] of possible dangers … that might depend on the operation of components other than” its product. Sanders v. Ingram Equipment, Inc., 531 So.2d 879, 880 (Ala. 1988). “[A]n ancillary component manufacturer has no duty to warn regarding the dangers associated with a separate manufacturer’s defective products.” Schreiner v. Wieser Concrete Prods., Inc., 720 N.W.2d 525, 530 (Wis. App. 2006).
Thus, when it comes to claims that a prescription medical product manufacturer could be liable for failure to warn about the risks of some other product, whether competing or compatible, such a targeted defendant can take advantage of a broad body of product liability precedent rejecting that sort of claim. Our clients are not alone. Numerous state statutes, and precedent concerning products ranging from asbestos to autos to scaffolds and soda bottles has limited the duty to warn to the risks of defendant manufacturers’ own products.