In this “failure to warn” case, plaintiffs-appellants Maryanne Garside and her daughter, Milissa, appeal the district court's entry of summary judgment in favor of defendant-appellee McKesson Corporation (“McKesson”). Because we conclude that the district court’s entry of summary judgment was premature, we reverse.
I. STANDARD OF REVIEW
Summary judgment is appropriate where “the pleadings, depositions, answers to interrogatories, and admissions on file, together with the affidavits, if any, show that there is no genuine issue as to any material fact and that the moving party is entitled to a judgment as a matter of law.” Fed.R.Civ.P. 56(c);
see also Celotex Corp. v. Catrett, 477
U.S. 317, 323,
In determining whether factual issues exist, we read the record “in the light most amiable to the nonmovants and indulge all reasonable inferences favorable to them.” Id. Appellate review of the district court’s grant of summary judgment is plenary. Id.
II. BACKGROUND
Viewing the record in a light most favorable to plaintiffs, we summarize the relevant facts. On April 20, 1982, Maryanne Garside took her three-year-old daughter Milissa, who was complaining of an earache, to Quincy Pediatric Associates (“QPA”). The QPA doctor concluded that Milissa had an ear infection and prescribed amoxicillin, an antibiotic. As Ms. Garside and Milissa were en route to the pharmacy to fill the prescription, Milissa suffered a febrile seizure. Ms. Garside immediately drove Milissa to Quincy City Hospital where she was admitted and remained for several days.
At Quincy City Hospital, Milissa was given amoxicillin for her ear infection and phenobarbital, a barbiturate, for her seizures. On April 23, 1982, Dr. Andrew Pry-harski of QPA discharged Milissa from the hospital and gave her prescriptions for both amoxicillin and phenobarbital.
On April 30, 1982, a rash began to develop on Milissa’s neck. The rash worsened and, on the following day, Ms. Garside took Milissa back to QPA. After examining Mil-issa, Dr. Pryharski concluded that she might have an allergy to the amoxicillin. As a result, he advised discontinuance of the amoxicillin and wrote a prescription for erythromycin, a substitute antibiotic.
By May 2, 1982, the rash had become so severe that Ms. Garside took her daughter to Massachusetts General Hospital, where Milissa spent two days in the burn unit. Milissa was then transferred to the Shriner’s Burn Institute, where she was diagnosed as having toxic epidermal necrolysis (“TEN”), a condition caused by the poisoning of the skin tissue. Currently, Milissa is legally blind, suffers from severe hearing loss, and has scars over most of her body.
Subsequently, Ms. Garside and Milissa sued,
inter alia,
McKesson, the manufac
McKesson’s motion relied entirely upon the following statement in Dr. Pryharski’s affidavit:
TEN is a condition which has been identified for a number of years [and] has its alleged connection to the ingestion of phenobarbital and/or amoxicillin, other drugs, and even in some cases no drugs. I do not now, nor did I in 1982, discuss with my patients any causative connection between those drugs and TEN.
Based upon the above statement, McKes-son argued that Dr. Pryharski’s practice of not informing his patients of the risks he understood to be associated with the ingestion of phenobarbital and/or amoxicillin constituted an intervening-superseding cause of Milissa’s harm.
In response to Dr. Pryharski’s affidavit, appellants submitted the affidavit of Dr. Theoharis Constantin Theoharides, their expert on the question of causation. In his affidavit, Dr. Theoharides focused on the inadequacy of the warnings given by McKesson. To support his contention that in 1982 McKesson should have warned physicians about the increased risk of acquiring TEN from the ingestion of phenobarbital and amoxicillin in combination, he included a list of approximately twenty-three articles, published prior to 1981, discussing “a relationship between amoxicillin and/or phenobarbital and TEN.... ” Following this list, the affidavit continued:
It is clear even from the literature prior to 1981 listed above that barbiturates and penicillins are implicated in TEN. There have been many more publication^] not listed here....
Amoxicillin is a semi-synthetic penicillin and phenobarbital is one of the barbiturates. Even though amoxicillin is typically used to treat ear infections, such as Milissa’s, and phenobarbital is probably the main drug used to treat febrile seizures, it is obvious that one should avoid combining the two whenever possible. Thus, the warnings contained in the 1981 Physician’s Desk Reference were certainly insufficient to warn of the possible causal relationship between amoxicillin and TEN, the possible causal relationship between phenobarbital and TEN, and the extreme danger of prescribing them in combination. In many drug reactions, the response is idiosyncratic, which means there may not be any need for predisposition or prior exposure. However, one should avoid compounding on a possible problem by addition of one or more of the other causative agents.It is my opinion, which I can state with reasonable medical certainty, that had proper warnings been given by the manufacturers of the amoxicillin and phenobarbital, the treating physician .would have been on notice not to prescribe them in combination and, therefore, said warnings were inadequate under all of the circumstances....
It is my opinion[,] which I can state with reasonable medical certainty[,] that there is a causal relationship between the failure to give proper warning and the injury suffered by Milissa Garside.
After reviewing the above evidence, the district court held that a trial on the adequacy of McKesson’s warning was not necessary.
See Garside v. Osco Drug, Inc.,
Because McKesson failed to point to sufficient evidence in the record, however, to show that Dr. Pryharski was aware in 1982 of an increased risk of acquiring TEN from the combined ingestion of phenobarbital and amoxicillin, we conclude that the district court prematurely entered judgment in favor of McKesson.
III. DISCUSSION
Under Massachusetts law,
2
a product may be unreasonably dangerous if the manufacturer fails to warn of a non-obvious risk associated with the normal use of the product about which the manufacturer knows or has reason to know.
See MacDonald v. Ortho Pharmaceutical Corp.,
The rationale underlying the prescription drug rule is that the prescribing physician, as the “learned intermediary” standing between the manufacturer and consumer/patient, is generally in the best position to evaluate the potential risks and benefits of ingesting a certain drug and to advise the patient accordingly. Under this doctrine, the manufacturer’s duty is fulfilled once it adequately warns the physician.
Thomas v. Hoffman-LaRoche, Inc.,
Where the manufacturer fails to provide the physician with an adequate warning, courts have held that the manufacturer may still be shielded from liability if it can show that the prescribing physician would not have heeded an adequate warning.
See, e.g., Guevara,
In a recent case where a defendant proffered a similar intervening-superseding cause argument, this Court concluded that the Massachusetts Supreme Judicial Court would apply a rebuttable presumption in favor of the plaintiff that a physician would have heeded an adequate warning.
4
See Knowlton,
Comment j to Section 402 A (2 Restatement of Torts 2d 353) establishes a presumption that an adequate warning, if given, will be read and heeded. In such a situation, the presumption established works to the benefit of the manufacturer. However, where no warning is given, or where an. inadequate warning is given, a rebuttable presumption arises, beneficial to the plaintiff, that the failure to adequately warn was a proximate cause of the plaintiffs ingestion of the drug. This presumption, absent the production of rebutting evidence by the defendant, is sufficient to satisfy the first branch of the plaintiffs proximate cause burden.
See Knowlton,
Under Massachusetts law, therefore, the burden shifting in a failure to warn case such as the instant one works as follows: (1) the plaintiff carries the initial burden of producing sufficient evidence that the defendant manufacturer failed to warn of a non-obvious risk about which the manufacturer knew or should have known,
see MacDonald,
In the instant case, therefore, we must determine
de novo
whether plaintiffs satisfied their burden of raising a triable issue on the question of whether McKesson failed to warn Dr. Pryharski of a non-obvious risk about which it knew or should have known.
5
To satisfy their initial burden, plaintiffs submitted the affidavit of Dr. Theoharides, their expert on causation.
6
In his affidavit, Dr. Theoharides proffered a list of twenty-three articles published pri- or to 1981 which he contends contain information making it “clear” that “barbiturates and penicillins are implicated in TEN.”
7
Based upon the existence of these pre-1981 publications, Dr. Theoharides asserts that, in 1982, a physician should have been warned about the risks of acquiring TEN from the combined ingestion of phenobarbital and amoxicillin. According to Dr. Theoharides, “had the physician been given sufficient information[,]” s/he would
Read in a light most favorable to plaintiffs, we think that Dr. Theoharides’ affidavit satisfied plaintiffs’ initial burden. Thus, plaintiffs are entitled to a rebuttable presumption that, had McKesson warned Dr. Pryharski, he would have heeded the warning.
See Knowlton,
First, to show that Dr. Pryharski would not have heeded an adequate warning, McKesson relied solely upon Dr. Pryhar-ski’s October 27, 1989, affidavit. This affidavit fails, however, to show that Dr. Pry-harski was aware in 1982 that there was a risk of acquiring TEN from the combined ingestion of phenobarbital and amoxicillin. Instead, it contains the following statement: “TEN is a condition which has been identified for a number of years [and] has its alleged connection to the ingestion of phenobarbital and/or amoxicillin, other drugs, and even in some cases no drugs.” Based on this statement, we know only that, on October 27, 1989, the date the affidavit was sworn out, Dr. Pryharski was aware that an “alleged connection” between TEN and the ingestion of the two drugs had been “identified” for an unspecified “number of years....” We do not know that Dr. Pryharski was aware of such “alleged connection” in 1982. As such, the affidavit is insufficient to show Dr. Pryharski’s knowledge.
Second, Dr. Pryharski’s use of the phrase “alleged connection” is problematically vague. For one thing, a reader could reasonably construe Dr. Pryharski’s use of the word “alleged” to mean that he did not in fact believe such a connection existed. Moreover, it is not clear that Dr. Pryhar-ski’s use of the word “connection” encompasses the causal relationship, discussed by Dr. Theoharides, between TEN and the combined ingestion of the two drugs.
Our conclusion that Dr. Pryharski’s affidavit falls short of entitling McKesson to summary judgment is buttressed by an examination of the facts of a line of cases in which courts have held a defendant manufacturer to be free from liability on the basis of a physician’s pre-trial statement that s/he would not have heeded an adequate warning. In all such cases, courts have required that the physician’s testimony show unequivocally that s/he knew at the relevant time
all
the information which would have been included in a proper warning.
See, e.g., Thomas,
In sum, we find that Dr. Pryharski’s affidavit falls short of entitling McKesson to judgment in its favor. Accordingly, we reverse.
Reversed and remanded.
Notes
. This case previously came before us on a motion for summary judgment brought by defendants Hoffman-Laroche, Inc., and Beecham, Inc., the alleged manufacturers of the drug amoxicillin.
See Garside,
. Both parties agree that the substantive law of Massachusetts governs our analysis in this diversity action.
. McKesson asserted below that the Massachusetts Supreme Judicial Court recognized this intervening-superseding cause argument in
MacDonald,
.Such a presumption is consistent with the principle followed in this Circuit that "a physician’s carelessness, even if it takes an unanticipated form, should not relieve a drug manufacturer of liability if the manufacturer’s failure to warn adequately
may
have contributed to that carelessness."
Brochu v. Ortho Pharmaceutical Corp.,
. Because it held that the adequacy of McKes-son’s warning was irrelevant as a matter of law, the district court did not reach this question.
. In its summary judgment motion, McKesson does not dispute that it failed to warn Dr. Pry-harski of the risk of acquiring TEN from the combined ingestion of phenobarbital and amox-icillin. Rather, it contends that such alleged failure to warn is irrelevant in light of Dr. Pryharski's alleged awareness of that risk. Thus, for the limited purpose of this appeal, we assume that plaintiffs are correct in their assertion that McKesson failed to warn Dr. Pryharski of this risk.
.Dr. Theoharides’ affidavit also includes a speculative statement concerning the increased statistical risk of acquiring TEN — a statistic which he formulated based upon his interpretation of a "recently published [1990] retrospective survey of TEN cases between 1972 and 1986_” Clearly, Dr. Theoharides’ reliance upon an article published well after Melissa Garside’s ingestion of the two drugs cannot inform any of • his testimony at trial. However, to the extent that McKesson interprets all of Dr. Theoharides' conclusions to be infected with the knowledge Dr. Theoharides gleaned from the 1990 publication, we reject such interpretation as a patent misunderstanding of the statements contained in paragraph 17 of his first affidavit.
. In
Thomas,
the Fifth Circuit determined that Mississippi law would not recognize the presumption that a physician would have heeded an adequate warning.
See Thomas,
. We have grave reservations about whether the Massachusetts Supreme Judicial Court would even follow the above-cited line of cases. In light of both the presumption afforded a plaintiff under Massachusetts law that a proper warning would be heeded,
see Knowlton,
