A diagnosis of Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN) can leave patients and their families with questions long after the immediate medical crisis begins to subside. What caused the reaction? Could it have been prevented? Why did a medication that was supposed to help make someone so seriously ill? And when does an adverse drug reaction become a potential legal case?
Those questions don't always have simple answers. SJS and TEN are rare, potentially life-threatening conditions that are most often associated with medications. Researchers continue to study why certain people develop these reactions, how to diagnose them earlier, and which medications carry the greatest risk. Recent medical reviews note that reliable biomarkers for early diagnosis remain lacking, while a 2026 meta-analysis examined the role of antiseizure medications in SJS/TEN.
For people trying to understand what happened after an SJS diagnosis, the legal questions can be just as complicated as the medical ones.
Attorney Brandon Smith is a partner with Childers, Schlueter & Smith and represents people and families nationwide in Stevens-Johnson syndrome and toxic epidermal necrolysis cases. His practice includes complex medical malpractice and serious injury litigation. We asked him about common questions that arise when someone suspects a medication or medical error may have contributed to SJS.
What are some of the first questions people ask after an SJS diagnosis?
Brandon Smith: One of the biggest questions is simply, "How did this happen?"
People may have gone to a doctor for an infection, seizure disorder, pain, or another medical problem and taken a medication exactly as directed. Then, sometimes within days or weeks, they're hospitalized with a condition they may never have heard of before.
Naturally, they want to know what caused the reaction and whether anyone could have prevented it. Other questions often follow. Was there an adequate warning about the risk? Should the medication have been prescribed in the first place? Were there signs of SJS that could have been recognized sooner?
Answering those questions often requires a close look at the patient's medical and medication history and piecing together the sequence of events.
How do you determine which medication may have caused SJS?
Brandon Smith: Timing is extremely important. We want to know every medication the patient was taking before symptoms developed, including prescription drugs, over-the-counter medications, and ones that were recently started or stopped. We also look at when each drug was prescribed, when the patient began taking it, whether the dosage changed, and when the first symptoms appeared.
Medical records can be particularly important because patients who become critically ill understandably may not remember every detail afterward. Pharmacy records, prescription histories, hospital records, physician notes, and other documentation can help reconstruct what happened.
Sometimes one medication stands out fairly quickly. In other cases, several possible drugs need to be looked at.
Can someone develop SJS from a medication they've taken safely before?
Brandon Smith: Yes. A previous history of taking a medication without a serious reaction doesn't necessarily rule that drug out.
That's one reason patients shouldn't assume that a familiar medication couldn't have played a role. For example, the FDA has specifically warned that serious skin reactions associated with acetaminophen can occur even in someone who has taken the medication previously without a problem.
From our perspective, the key is to consider the complete medication history rather than assume what someone has tolerated in the past.
Does developing SJS after taking a medication automatically mean there is a lawsuit?
Brandon Smith: A medication causing a serious adverse reaction doesn't automatically mean a drug manufacturer, physician, pharmacy, or anyone else was legally responsible.
Figuring out your legal options is about more than establishing that a medication was involved. We may need to determine what was known about the drug's SJS risk, what warnings were provided, whether those warnings were adequate, how the medication was prescribed, and what happened once symptoms appeared.
Each case must be evaluated based on its own facts.
When can a drug warning become important in an SJS case?
Brandon Smith: Drug manufacturers have obligations involving the warnings that accompany their products. In an SJS case, we may look closely at what the label said about serious skin reactions when the patient took the medication.
We also consider what risk information was available to the manufacturer and whether the warnings appropriately communicated that risk to healthcare providers.
But an SJS warning doesn't automatically resolve the issue either. The specific language, the information available at the relevant time, and the circumstances surrounding the patient's prescription can all matter.
Could an SJS case involve medical malpractice instead of a drug manufacturer?
Brandon Smith: Potentially. SJS cases don't all involve the same type of legal claim.
Questions may arise about whether a healthcare provider appropriately considered a patient's medical or medication history, responded to known risk factors, or recognized signs of a serious drug reaction once symptoms developed.
SJS can be difficult to diagnose early because initial symptoms may resemble other illnesses. A delayed diagnosis by itself doesn't necessarily establish malpractice. The question is whether the care provided under the particular circumstances met the applicable medical standard of care and whether a failure to do so caused additional harm.
That generally requires careful review of the records and, when appropriate, consultation with qualified medical experts.
Why does early SJS recognition matter so much?
Brandon Smith: SJS and TEN can progress rapidly, so recognizing a potentially serious drug reaction and identifying the suspected medication can be critical.
From a legal perspective, we often look closely at the patient's early encounters with the healthcare system. What symptoms did the patient report? What did the provider observe? What medications were documented? What instructions did the patient receive?
That doesn't mean every missed early diagnosis is negligence. SJS is rare and can be difficult to distinguish from more common conditions during its earliest stages. But when someone has suffered severe complications, it's reasonable to examine whether warning signs should have prompted additional evaluation or treatment.
For more on the medical challenges involved, Legal Examiner recently examined why Stevens-Johnson syndrome can be difficult to diagnose in emergency departments.
What records should someone preserve after an SJS or TEN diagnosis?
Brandon Smith: Medical and pharmacy records are obviously important, but I also encourage families not to discard things simply because they don't initially seem significant.
Medication bottles and packaging may be useful. So can discharge instructions, pharmacy paperwork, patient portal messages, photographs of how symptoms progressed, and a list of the physicians, hospitals, urgent care centers, and pharmacies involved.
It can also help to write down a timeline while events are still relatively fresh. When did the fever begin? When did the rash appear? When was the medication started? When did the patient first seek care? When was SJS suspected?
Someone recovering from a serious illness shouldn't have to conduct their own legal investigation. But preserving what is readily available can make it easier to reconstruct the events later.
What makes SJS cases particularly complicated?
Brandon Smith: One challenge is that the medicine and the law overlap so much. Before you can evaluate potential legal responsibility, you have to understand what likely caused the reaction. That may require reviewing medications, timing, symptoms, pathology, treatment, medical literature, drug labeling, and other evidence.
Then there are separate legal questions. Was there an inadequate warning? Was the medication prescribed appropriately? Was there an unreasonable delay in recognizing the condition? Did that delay worsen the patient's injuries?
You can't really evaluate the legal side without first understanding the medical story.
What if someone was taking several medications when SJS developed?
Brandon Smith: That's not unusual, and it can make determining the likely trigger more difficult. We don't want to simply identify the newest medication and assume it was responsible. Each drug needs to be considered in the context of when it was taken, what is known about its association with SJS/TEN, and the patient's clinical course.
This is one reason a detailed medication timeline can become such an important part of the investigation.
When should someone with SJS consider talking to an attorney?
Brandon Smith: You don't need to know whether you have a case before speaking with an attorney. Determining whether there is a viable claim is part of what the attorney should help you figure out.
If SJS or TEN resulted in a lengthy hospitalization, permanent vision problems, scarring, organ damage, other lasting complications, or death, and there are questions about a medication or the medical care the patient received, it may be worth having the circumstances reviewed.
Deadlines can also affect legal claims, and those deadlines vary depending on the type of case and where it arose. Waiting until every medical question has been answered isn't always the best approach.
For families, the first goal is obviously getting through the medical crisis. The legal investigation can come afterward, but it shouldn't necessarily be put off indefinitely.
Getting Answers After Stevens-Johnson Syndrome
An SJS or TEN diagnosis doesn't by itself establish that someone did something wrong. These reactions can occur even when a medication is appropriately prescribed and accompanied by adequate warnings.
Patients and families who are left wondering why the reaction happened don't have to answer those questions on their own. An SJS attorney can review medication history, medical records, drug labeling, and other evidence to determine whether there are grounds for a product liability or SJS medical malpractice claim.
For people dealing with the long-term consequences of Stevens-Johnson syndrome or toxic epidermal necrolysis, understanding what happened can be an important part of deciding what comes next.
