Stevens-Jonhson syndrome after acetaminophen ingestion, confirmed by challenge test in an eleven-year-old patient

A review of published cases of Stevens-Johnson syndrome and toxic epidermal necrolysis associated with the use of acetaminophen

PURPOSE

Acetaminophen (paracetamol) is a widely used analgesic and antipyretic. In several studies, its use was associated with the occurrence of Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN). This narrative review aimed to explore and summarise available cases of SJS/TEN suspected to be associated with acetaminophen reported in the literature.

MATERIALS AND METHODS

Electronic searches were conducted in PubMed/MEDLINE, Web of Science, Scopus and Serbian Citation Index (SCIndeks). Case reports or case series which reported detailed clinical description of the patients diagnosed with SJS, TEN or SJS/TEN overlap which was caused or suspected to be most likely caused by acetaminophen with available full text were included in the review.

RESULTS

Twenty-nine publications describing a total of 36 patients which satisfied inclusion criteria were included in the review. The age of the patients ranged from 3 to 77 years (median: 32.5 years). There were 15 female (41.7%) and 15 male (41.7%) patients, while for 6 patients (16.7%) gender was not reported. TEN, SJS and SJS/TEN overlap were diagnosed in 24 (66.7%), 10 (27.8%) and 2 (5.6%) patients, respectively. Reported time from the first dose of acetaminophen to the onset of the first symptoms of SJS/TEN ranged from promptly to 21 days, with a median of 3 days. Use of some form of supportive and symptomatic care was reported in 28 patients (77.8%). Systemic corticosteroids were reported to be administered in 25 patients (69.4%) and intravenous immunoglobulin in 16 patients (44.4%). All patients survived. Long-term consequences (sequelae) were reported in 5 patients (13.9%).

CONCLUSIONS

Clinicians should be aware that SJS/TEN may be an adverse effect of acetaminophen and keep in mind that its prompt recognition and withdrawal of the culprit drug along with supportive care is of utmost importance.

Paracetamol - An old drug with new mechanisms of action

Paracetamol (acetaminophen) is the most commonly used over-the-counter (OTC) drug in the world. Despite its popularity and use for many years, the safety of its application and its mechanism of action are still unclear. Currently, it is believed that paracetamol is a multidirectional drug and at least several metabolic pathways are involved in its analgesic and antipyretic action. The mechanism of paracetamol action consists in inhibition of cyclooxygenases (COX-1, COX-2, and COX-3) and involvement in the endocannabinoid system and serotonergic pathways. Additionally, paracetamol influences transient receptor potential (TRP) channels and voltage-gated Kv7 potassium channels and inhibits T-type Cav3.2 calcium channels. It also exerts an impact on L-arginine in the nitric oxide (NO) synthesis pathway. However, not all of these effects have been clearly confirmed. Therefore, the aim of our paper was to summarize the current state of knowledge of the mechanism of paracetamol action with special attention to its safety concerns.

Is acetaminophen associated with a risk of Stevens-Johnson syndrome and toxic epidermal necrolysis? Analysis of the French Pharmacovigilance Database

AIM

Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are rare but severe mostly drug-induced cutaneous reactions. Acetaminophen is an over-the-counter drug used worldwide to treat pain and reduce fever. In 2013, the US Food and Drug Administration informed the public that acetaminophen was associated with a rare risk of SJS/TEN. The aim of the present retrospective study was to analyse reports of acetaminophen as a possible suspect in the development of SJS/TEN from the French Pharmacovigilance Database (FPDB).

METHODS

Cases of TEN/SJS with acetaminophen as a suspect drug registered in the FPDB, collected from January 2002 to December 2013, were analysed by an expert group. The algorithm of drug causality for epidermal necrolysis (ALDEN) was used as a reference tool for SJS/TEN to assess the causality of each suspect drug.

RESULTS

After exclusion of 16 nonvalidated cases, 112 cases (47 TEN, 51 SJS, 14 SJS/TEN overlaps) involving 574 suspected drugs (5⋅1/case) were analysed. In 80 cases, the acetaminophen ALDEN score was inferior or equal to that of other drugs, associated with a higher suspicion for causality. In 32 cases, acetaminophen had the highest score but matched with a 'very unlikely' or 'unlikely' causality in 12 cases. For the 20 remaining cases with a 'possible' or ' probable' causality, a protopathic or a confounding bias was likely in 14 cases.

CONCLUSIONS

After analysis of the French pharmacovigilance data using the ALDEN algorithm, we found no obvious SJS/TEN risk related to the use of acetaminophen in this large national series.

Rapid onset of Stevens-Johnson syndrome and toxic epidermal necrolysis after ingestion of acetaminophen

Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are rare, but life-threatening, severe cutaneous adverse reactions most frequently caused by exposure to drugs. Several reports have associated the use of acetaminophen with the risk of SJS or TEN. A typical interval from the beginning of drug therapy to the onset of an adverse reaction is 1-3 weeks. A 43-year-old woman and a 60-year-old man developed skin lesions within 3 days after administration of acetaminophen for a 3-day period. Rapid identification of the symptoms of SJS and TEN caused by ingestion of acetaminophen enabled prompt withdrawal of the culprit drug. After administration of intravenous immunoglobulin G, both patients recovered fully and were discharged. These two cases of rapidly developed SJS/TEN after ingestion of acetaminophen highlight the possibility that these complications can develop within only a few days following ingestion of over-the-counter medications such as acetaminophen.