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CASE REPORT article

Front. Pharmacol., 10 February 2026

Sec. Cardiovascular and Smooth Muscle Pharmacology

Volume 16 - 2025 | https://doi.org/10.3389/fphar.2025.1695177

Clopidogrel-induced drug-induced hypersensitivity syndrome following percutaneous coronary intervention: a case report of therapeutic dilemma and management strategy

Sikun Wang
&#x;Sikun Wang1*Jiang Zhou&#x;Jiang Zhou2Yuanhua Sun&#x;Yuanhua Sun3
  • 1Department of Gastroenterology, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei, China
  • 2Department of Emergency Medicine, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei, China
  • 3Department of Spinal Surgery, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei, China

Background: Drug-induced hypersensitivity syndrome (DIHS), also known as drug reaction with eosinophilia and systemic symptoms (DRESS), is a rare but potentially life-threatening adverse drug reaction. Clopidogrel induced DHS following percutaneous coronary intervention (PCI) presents a unique therapeutic challenge due to the critical need for dual antiplatelet therapy to prevent stent thrombosis.

Case summary: A 70-year-old male underwent emergency PCI with multiple stent implantation for unstable angina with three-vessel coronary disease. Standard dual antiplatelet therapy (aspirin 100 mg daily and clopidogrel 75 mg daily) was initiated post-procedure. One hour after PCI, the patient developed anaphylactic shock initially attributed to contrast agent allergy. Two weeks post-discharge, he presented with recurrent skin rash, hypotension, gastrointestinal bleeding, fever, and eosinophilia, consistent with DIHS. Multidisciplinary consultation confirmed clopidogrel-induced DIHS using established diagnostic criteria. Despite the high risk of stent thrombosis, dual antiplatelet therapy was discontinued due to life-threatening complications. The patient was successfully managed with indobufen and low dose corticosteroids, resulting in complete symptom resolution.

Conclusion: This case highlights the diagnostic complexity of clopidogrel-induced DIHS and presents the detailed account of successful management of it. Early recognition using standardized diagnostic criteria and multidisciplinary management are crucial for patient outcomes.

Introduction

Drug-induced hypersensitivity syndrome (DIHS), also referred to as drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome, represents a severe, potentially fatal adverse drug reaction characterized by the classic triad of fever, skin eruption, and internal organ involvement (Cacoub et al., 2011; Cho et al., 2017). The syndrome typically manifests 2–6 weeks after drug initiation, with a reported mortality rate of 5%–10% (Hama et al., 2022; Wei et al., 2024). Pathophysiology involves complex T-cell-mediated delayed hypersensitivity reactions, which are usually triggered by the formation of new antigen complexes between reactive drug metabolites and organism protein. Activated T lymphocytes produce large amounts of pro-inflammatory cytokines, causes systemic inflammation and organ failure associated with DRESS (Pichler, 2019; Miyagawa and Asada, 2021; Calle et al., 2023). Clopidogrel, a thienopyridine P2Y12 receptor antagonist, is an essential component of dual antiplatelet therapy (DAPT) following PCI. It is usually well tolerated and rarely causes severe allergic reactions, including DIHS. The active metabolites of clopidogrel, especially two-ox-clopidogrel, trigger T-cell immune responses through interactions with cellular proteins (Dansette et al., 2013; Kazui et al., 2010).

The clinical challenge in post-PCI settings is profound: discontinuation of DAPT within the first 3 months significantly increases the risk of stent thrombosis, a potentially fatal complication occurring in 0.5%–2% of patients (Iakovou et al., 2005; Levine et al., 2016). However, the continued use of pathogenic drugs in established DIHS can lead to progressive multiple organ failure and death. This case report aims to conduct a comprehensive analysis of clopidogrel-induced DIHS using the established diagnostic framework and propose a personalized treatment approach that balances the risks of thrombosis and allergy.

Case summary

A 70-year-old male with a medical history of hypertension (controlled with enalapril 20 mg daily) and type 2 diabetes mellitus (managed with metformin 1,000 mg daily) presented to the emergency department with unstable angina. His HbA1c was 6.8%, and blood pressure was well-controlled at 135/80 mmHg. The patient had no known drug allergies or previous adverse drug reactions. Emergent cardiac catheterization revealed severe three-vessel coronary artery disease with critical stenoses: 95% stenosis of the left anterior descending artery (LAD), 90% stenosis of the left circumflex artery (LCX), and 85% stenosis of the right coronary artery (RCA), the SYNTAX I score tends to reach the boundary between low and medium-risk stratification. The patient was immediately given loading doses including 300 mg of aspirin and 600 mg of clopidogrel. Subsequently, he successfully underwent PCI with implantation of three second-generation drug-eluting stents (Firebird2 3.5*2.3 mm) with final TIMI three flow and no periprocedural complications. Standard post-PCI medications were initiated: Aspirin 100 mg daily, Clopidogrel 75 mg daily, Rosuvastatin 20 mg daily, Metoprolol 50 mg twice daily, Enalapril 20 mg daily (continued). Approximately 1 hour post-procedure, the patient developed acute onset generalized urticaria, severe hypotension (blood pressure 75/45 mmHg), and bronchospasm consistent with anaphylactic shock. The reaction was initially attributed to iodinated contrast agent hypersensitivity given the temporal relationship. Emergency treatment included intravenous epinephrine 0.5 mg, methylprednisolone 125 mg IV, diphenhydramine 50 mg IV and aggressive fluid resuscitation. The patient responded rapidly to treatment with complete resolution of symptoms within 2 h. He was monitored in the cardiac care unit for 48 h and discharged home on standard post-PCI medications.

The patient presented to the emergency department with progressive fusion rashes involving the trunk and extremities on the day 14 post-PCI (Figure 1). The rash was nonpruritic and associated with low-grade fever (temperature 38.2 °C), and development of additional symptoms on the day 16 post-PCI including persistent fever (up to 39.1 °C), hypotension episodes (systolic BP 85–95 mmHg), persistent hematemesis and melena, facial edema, generalized malaise and confusion, Comprehensive laboratory investigations were performed (Table 1), Chest X-ray confirmed bilateral lower lobe infiltrates, abdominal CT confirmed mild hepatomegaly, and echocardiography confirmed normal left ventricular function, no pericardial effusion. Gastroscopy revealed gastric and duodenal ulcers accompanied by active bleeding. We attributed the bleeding mainly to aspirin-related gastrointestinal injury and early DAPT amplified it. Subsequent endoscopic treatment successfully stopped the bleeding. (Figure 2). The DIHS/DRESS diagnostic criteria usually adopted RegiSCAR criteria and our patient achieved a definite DRESS diagnosis (score 9), The probable causality score. Supports clopidogrel as the likely pathogenic factors. So we organized a multidisciplinary team including cardiology, hematology, dermatology, gastroenterology, and clinical pharmacology was assembled. The team faced a critical therapeutic dilemma including risk of continuing clopidogrel and discontinuing clopidogrel.

Table 1
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Table 1. Laboratory findings during DIHS episode.

Figure 1
Panel a shows a person's back with widespread red rash and irritation. Panel b displays the person's legs, also exhibiting a similar red rash and inflammation. Both images indicate significant skin irritation.

Figure 1. (a,b) The patient presented with diffuse, concomitant, non-pruritic erythema, involving the trunk and limbs, without extensive epidermal necrosis and peeling or multiple mucosal erosions.

Figure 2
Endoscopic images showing different views of the esophagus. Panel a: inflamed esophageal tissue. Panel b: two stents are visible inside the esophagus. Panel c: inflamed and ulcerated tissue. Panel d: closer view of stents within the esophagus, showing tissue interaction.

Figure 2. (a,b) The first gastroscopy of the patient revealed a thrombus head in the upper descending part of the duodenum, accompanied by active bleeding. Three titanium clips were used for clamping and hemostasis. (c,d) The patient’s second gastroscopy revealed a local thrombus head in the upper descending part of the duodenum, accompanied by active bleeding. Five titanium clips were used again for clamping and hemostasis.

On the 18th day after PCI, due to the dual risks of life-threatening DIHS/DRESS and persistent upper gastrointestinal bleeding. We believe that in the process of extensive corticosteroid treatment, priority should be given to controlling allergic reactions and preventing rebleeding. After reaching a multidisciplinary consensus, clopidogrel and aspirin was discontinued. As an individualized, risk-mitigating alternative, indobufen 100 mg twice daily was initiated, prednisolone 1 mg/kg/day (70 mg daily) for DIHS management, proton pump inhibitors protect the gastrointestinal tract (omeprazole 40 mg twice daily) and supportive care including fluid management and monitoring. The patient rapidly improvement in skin rash within 48 h, the fever relieved on the 21st day, the eosinophil count normalized on the 23rd day, gastrointestinal bleeding stopped, and liver function improved, Troponin T monitoring has always been below 0.02 μg/L. During the subsequent 24-month long-term follow-up, the patient continued indobufen treatment and tolerated it well. DIHS achieved complete remission without sequelae, coronary angiography indicated that the stent was unobstructed without stenosis and other cardiovascular events occurred, no gastrointestinal bleeding occurred, eosinophil counts, liver and renal function normalized and physical functional status returned to the baseline level (Table 2).

Table 2
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Table 2. Long-term follow-up data.

Discussion

Clopidogrel-induced DIHS is a complex immune phenomenon involving multiple pathways. This drug is widely metabolized in the liver through cytochrome P450 enzymes, especially CYP2C19, CYP3A4 and CYP1A2 enzymes involved in metabolite production (Kazui et al., 2010; Zhang et al., 2012). Among them, the CYP2C19 gene polymorphism may affect the risk of DIHS occurrence. Patients with CYP2C19*2 and *3 alleles (poor metabolism) may have altered metabolite profiles, which may regulate immunogenicity and clinical phenotypes (Mega et al., 2009). Although genotyping was not performed in this case, we acknowledge its prospective value for risk stratification and post-event evaluation in clopidogrel hypersensitivity, and we encourage future studies to integrate pharmacogenomics into prediction and prevention frameworks for DIHS/DRESS. The diagnosis of clopidogrel-induced DIHS presents several challenges including delayed Onset, initial misattribution, DIHS. Symptoms can overlap with other postoperative complications, including infection, contrast-induced nephropathy or surgery-related bleeding. So the application of standardized diagnostic criteria is crucial. The DIHS/DRESS diagnostic criteria usually adopted RegiSCAR criteria (Table 3) and our patient achieved a definite DRESS diagnosis (score 9), This scoring system has 94% specificity and 85% sensitivity for DRESS diagnosis (Kardaun et al., 2013; Sasidharanpillai et al., 2022). The Naranjo scores of the three suspected drugs were all within the “possible” range (Naranjo et al., 1981) (Table 4). Therefore, recognizing the limitations of Naranjo in terms of delayed potentially fatal reactions, we added the ADDRESS (Table 5) algorithm to further compare the three suspected drugs (clopidogrel, aspirin, and iodine contrast agent) (Stewart and Ramírez, 2024). Clopidogrel aligned most closely with a 2–6-week latency, eosinophilia, multi-organ involvement typical of DIHS/DRESS, and improvement after withdrawal. Aspirin remains a possible factor, but its consistency with the systemic manifestation dominated by eosinophils and the temporal relationship is relatively weak. The contrast agent well explains the immediate allergic reaction after PCI, rather than the delayed DIHS/DRESS occurrence trajectory. While residual uncertainty remains, the aggregate clinical and temporal evidence favored clopidogrel as the primary trigger.

Table 3
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Table 3. DIHS/DRESS diagnostic criteria (RegiSCAR diagnostic).

Table 4
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Table 4. Naranjo causality assessment.

Table 5
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Table 5. ADDRESS-informed multi-suspect causality scoring.

We also conducted a comprehensive literature review of previously reported cases of clopidogrel-induced DIHS/DRESS. The consensus across reports indicates that immediate discontinuation of the offending agent is the primary therapeutic step, followed by systemic corticosteroids and supportive care for severe systemic involvement. To maintain essential antiplatelet protection, alternative agents with distinct mechanisms should be selected and closely monitored. In China, prasugrel is not yet available. Previous case reports have described immune cross-reactivity between clopidogrel and prasugrel after drug substitution (Siu et al., 2016). Ticagrelor, a reversible and chemically distinct P2Y12 inhibitor, is a guideline-recommended first-line alternative. Several reports have documented successful use of ticagrelor in patients with clopidogrel hypersensitivity without recurrent allergic reactions (Manchette and Drucker, 2014; Harris and Coons, 2014). However, isolated cases of cross-reactive hypersensitivity after switching to ticagrelor have been reported (Chin et al., 2015), possibly due to shared P2Y12 receptor inhibition during an immunologically active period. Although ticagrelor and clopidogrel have different chemical structure and a lower theoretical risk of cross-reaction, there is uncertainty of reactivation of allergic reactions when re-exposed to the P2Y12 pathway during the highly active immune period. In parallel, the patient has endoscopically confirmed upper gastrointestinal bleeding, the combination of potent P2Y12 inhibitors would significantly amplify the risk of bleeding in the situation of systemic hormone therapy. Clinical trials from china have demonstrated that indobufen can safely replace aspirin as part of DAPT after DES implantation (Shi et al., 2022), reducing bleeding risk without compromising ischemic protection. Aspirin monotherapy or dose escalation was inappropriate due to heightened gastrointestinal bleeding risk. Facing the dual threat of life-threatening DIHS/DRESS progression and active gastrointestinal bleeding, the multidisciplinary team determined that these complications outweighed the short-term risk of stent thrombosis and serial troponin measurements remained within the normal range after PCI, indicating no peri-procedural myocardial injury or acute stent thrombosis. This biochemical stability provided supportive evidence for the temporary discontinuation of DAPT during management of life-threatening DIHS/DRESS. Considering the regional availability, gastrointestinal safety, and distinct pharmacologic mechanism of indobufen (COX inhibition), after obtaining the informed consent of the patients for the treatment plan and conducting a common risk assessment, we ultimately adopted indobufen monotherapy as a transitional individualized strategy. It should be emphasized that although indobufen has been used in China as a substitute for aspirin in DAPT following PCI, randomized data supporting its immediate monotherapy use in ACS patients are limited. We therefore do not recommend indobufen monotherapy as a universal replacement for guideline-directed DAPT, but as a feasible contingency when life-threatening DIHS/DRESS and active bleeding coexist. If the ischemic risk increases during follow-up, a ticagrelor-based regimen (including short-term DAPT followed by monotherapy) remains our designated alternative strategy.

The patient felt uncomfortable due to the appearance of DRESS and persistent active bleeding, and was also worried that if the treatment plan was adjusted, it might cause thrombosis within the stent. After a comprehensive understanding of the multidisciplinary consultation opinions and individualized treatment plans, the patient agreed to adopt the indobufen treatment plan, which focuses on controlling allergic reactions and preventing bleeding. During the long-term follow-up period, the symptoms were effectively relieved and no ischemic events occurred. The patient expressed satisfaction with the treatment effect.

Conclusion

This case report presents the detailed account of successful management of clopidogrel-induced DIHS. It highlights multiple clinical values: achieving objective diagnosis and causal relationship assessment through standardization tools, and the importance of multidisciplinary collaboration in the management of complications after complex PCI. During the treatment process, it is necessary to emphasize the necessity of early identification, timely drug withdrawal, reasonable supportive treatment and individualized alternative antiplatelet regimens selection. The feasibility and safety of the alternative strategies are verified through systematic risk-benefit analysis and long-term follow-up. Clinicians should remain highly vigilant about delayed drug hypersensitivity in patients after PCI and promptly activate alternative treatment options when standard treatment contraindications occur. Future research should focus on pharmacogenomics, develop predictive models for DIHS risk, conduct comparative effectiveness studies on alternative antiplatelet strategies, and establish a complete set of practical guidelines and expert consensus for managing this rare but serious complication.

Data availability statement

Because the dataset concerns a single patient and includes potentially identifiable clinical information, the raw data are not publicly available to protect privacy and comply with institutional/ethical requirements. Upon reasonable request, and subject to a Data Use Agreement and IRB approval/waiver consistent with the consent obtained, a de-identified minimal dataset (case timeline, aggregated key laboratory values, causality scores “RegiSCAR/Naranjo/RUCAM” and medication summary; redacted key imaging frames if applicable) may be shared. Data are provided for research use only with no onward sharing or re-identification. Requests should be directed to the corresponding author.

Ethics statement

The studies involving humans were approved by the Ethics commitee of shiyan Taihe hospital. The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study. Written informed consent was obtained from the individual(s) for the publication of any potentially identifiable images or data included in this article.

Author contributions

SW: Writing – original draft. JZ: Writing – review and editing, Data curation, Resources, Supervision. YS: Writing – review and editing, Supervision.

Funding

The author(s) declare that no financial support was received for the research and/or publication of this article.

Acknowledgments

We thank the multidisciplinary team members who contributed to the patient’s care and the patient for providing consent for publication of this case report.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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The author(s) declare that no Generative AI was used in the creation of this manuscript.

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References

Cacoub, P., Musette, P., Descamps, V., Meyer, O., Speirs, C., Finzi, L., et al. (2011). The DRESS syndrome: a literature review. Am. J. Med. 124 (7), 588–597. doi:10.1016/j.amjmed.2011.01.017

PubMed Abstract | CrossRef Full Text | Google Scholar

Calle, A. M., Aguirre, N., Ardila, J. C., and Cardona Villa, R. (2023). DRESS syndrome: a literature review and treatment algorithm. World Allergy Organ. J. 16 (3), 100673. doi:10.1016/j.waojou.2022.100673

PubMed Abstract | CrossRef Full Text | Google Scholar

Cheema, A. N., Mohammad, A., Hong, T., Jakubovic, H. R., Parmar, G. S., Sharieff, W., et al. (2011). Characterization of clopidogrel hypersensitivity reactions and management with oral steroids without clopidogrel discontinuation. J. Am. Coll. Cardiol. 58 (14), 1445–1454. doi:10.1016/j.jacc.2011.06.040

PubMed Abstract | CrossRef Full Text | Google Scholar

Chin, N., Rangamuwa, K., Mariasoosai, R., Carnes, J., and Thien, F. (2015). Oral antiplatelet agent hypersensitivity and cross-reactivity managed by successful desensitisation. Asia Pac. allergy 5 (1), 51–54. doi:10.5415/apallergy.2015.5.1.51

PubMed Abstract | CrossRef Full Text | Google Scholar

Cho, Y. T., Yang, C. W., and Chu, C. Y. (2017). Drug reaction with eosinophilia and systemic symptoms (DRESS): an interplay among drugs, viruses, and immune system. Int. J. Mol. Sci. 18 (6), 1243. doi:10.3390/ijms18061243

PubMed Abstract | CrossRef Full Text | Google Scholar

Dansette, P. M., Levent, D., Hessani, A., Bertho, G., and Mansuy, D. (2013). Thiolactone sulfoxides as new reactive metabolites acting as bis-electrophiles: implication in clopidogrel and prasugrel bioactivation. Chem. Res. Toxicol. 26 (5), 794–802. doi:10.1021/tx400083b

PubMed Abstract | CrossRef Full Text | Google Scholar

Hama, N., Abe, R., Gibson, A., and Phillips, E. J. (2022). Drug-Induced hypersensitivity syndrome (DIHS)/Drug reaction with eosinophilia and systemic symptoms (DRESS): clinical features and pathogenesis. J. Allergy Clin. Immunol. Pract. 10 (5), 1155–1167.e5. doi:10.1016/j.jaip.2022.02.004

PubMed Abstract | CrossRef Full Text | Google Scholar

Harris, J. R., and Coons, J. C. (2014). Ticagrelor use in a patient with a documented clopidogrel hypersensitivity. Ann. Pharmacother. 48 (9), 1230–1233. doi:10.1177/1060028014539143

PubMed Abstract | CrossRef Full Text | Google Scholar

Iakovou, I., Schmidt, T., Bonizzoni, E., Ge, L., Sangiorgi, G. M., Stankovic, G., et al. (2005). Incidence, predictors, and outcome of thrombosis after successful implantation of drug-eluting stents. JAMA 293 (17), 2126–2130. doi:10.1001/jama.293.17.2126

PubMed Abstract | CrossRef Full Text | Google Scholar

Kardaun, S. H., Sekula, P., Valeyrie-Allanore, L., Liss, Y., Chu, C. Y., Creamer, D., et al. (2013). Drug reaction with eosinophilia and systemic symptoms (DRESS): an original multisystem adverse drug reaction. Results from the prospective RegiSCAR study. Br. J. Dermatology 169 (5), 1071–1080. doi:10.1111/bjd.12501

PubMed Abstract | CrossRef Full Text | Google Scholar

Kazui, M., Nishiya, Y., Ishizuka, T., Hagihara, K., Farid, N. A., Okazaki, O., et al. (2010). Identification of the human cytochrome P450 enzymes involved in the two oxidative steps in the bioactivation of clopidogrel to its pharmacologically active metabolite. Drug metabolism Dispos. Biol. Fate Chem. 38 (1), 92–99. doi:10.1124/dmd.109.029132

PubMed Abstract | CrossRef Full Text | Google Scholar

Lawton, J. S., Tamis-Holland, J. E., Bangalore, S., Bates, E. R., Beckie, T. M., Bischoff, J. M., et al. (2022). 2021 ACC/AHA/SCAI Guideline for coronary artery revascularization: a report of the American college of Cardiology/American Heart association joint Committee on clinical practice Guidelines. J. Am. Coll. Cardiol. 79 (2), e21–e129. doi:10.1016/j.jacc.2021.09.006

PubMed Abstract | CrossRef Full Text | Google Scholar

Levine, G. N., Bates, E. R., Bittl, J. A., Brindis, R. G., Fihn, S. D., Fleisher, L. A., et al. (2016). ACC/AHA guideline focused update on duration of dual antiplatelet therapy in patients with coronary artery disease. Circulation, 134 (10), e123–e155. doi:10.1161/CIR.0000000000000404

PubMed Abstract | CrossRef Full Text | Google Scholar

Manchette, A. M., Drucker, A. G., and Januzzi, J. L., Jr (2014). Acute coronary syndrome antiplatelet alternatives in clopidogrel allergy. Pharmacotherapy 34 (8), e152–e156. doi:10.1002/phar.1446

PubMed Abstract | CrossRef Full Text | Google Scholar

Mega, J. L., Close, S. L., Wiviott, S. D., Shen, L., Hockett, R. D., Brandt, J. T., et al. (2009). Cytochrome p-450 polymorphisms and response to clopidogrel. N. Engl. J. Med. 360 (4), 354–362. doi:10.1056/NEJMoa0809171

PubMed Abstract | CrossRef Full Text | Google Scholar

Miyagawa, F., and Asada, H. (2021). Current perspective regarding the immunopathogenesis of drug-induced hypersensitivity Syndrome/Drug reaction with eosinophilia and systemic symptoms (DIHS/DRESS). Int. J. Mol. Sci. 22 (4), 2147. doi:10.3390/ijms22042147

PubMed Abstract | CrossRef Full Text | Google Scholar

Naranjo, C. A., Busto, U., Sellers, E. M., Sandor, P., Ruiz, I., Roberts, E. A., et al. (1981). A method for estimating the probability of adverse drug reactions. Clin. Pharmacol. Ther. 30 (2), 239–245. doi:10.1038/clpt.1981.154

PubMed Abstract | CrossRef Full Text | Google Scholar

Pichler, W. J. (2019). Immune pathomechanism and classification of drug hypersensitivity. Allergy 74 (8), 1457–1471. doi:10.1111/all.13765

PubMed Abstract | CrossRef Full Text | Google Scholar

Sasidharanpillai, S., Ajithkumar, K., Jishna, P., Khader, A., Anagha, K. V., Binitha, M. P., et al. (2022). RegiSCAR DRESS (drug reaction with eosinophilia and systemic symptoms) validation scoring System and Japanese Consensus Group criteria for atypical drug-induced hypersensitivity syndrome (DiHS): a comparative analysis. Indian Dermatology Online J. 13 (1), 40–45. doi:10.4103/idoj.idoj_196_21

PubMed Abstract | CrossRef Full Text | Google Scholar

Shi, Q. P., Luo, X. Y., Zhang, B., Wang, X., Zhao, J., Xie, Q. F., et al. (2022). Effect of indobufen vs. aspirin on platelet accumulation in patients with stable coronary heart disease after percutaneous coronary intervention: an open-label crossover study. Front. Pharmacol. 13, 950719. doi:10.3389/fphar.2022.950719

PubMed Abstract | CrossRef Full Text | Google Scholar

Siu, H., Kaliyadan, A., Fischman, D. L., Nardone, E., Poll, D., and Savage, M. P. (2016). Use of prasugrel in the setting of clopidogrel hypersensitivity: case report and systematic review of the literature. Platelets 27 (8), 824–827. doi:10.1080/09537104.2016.1203402

PubMed Abstract | CrossRef Full Text | Google Scholar

Stewart, S., Ramírez, E., Jiménez-González, M., Carcas, A. J., Borobia, A. M., and Ramírez, E. (2024). ALDRESS: a retrospective pilot Study to develop a pharmacological causality Algorithm for drug reaction with eosinophilia and systemic symptoms (DRESS). J. Clin. Med. 13 (9), 2622. doi:10.3390/jcm13092622

PubMed Abstract | CrossRef Full Text | Google Scholar

Wei, B. M., Fox, L. P., Kaffenberger, B. H., Korman, A. M., Micheletti, R. G., Mostaghimi, A., et al. (2024). Drug-induced hypersensitivity syndrome/drug reaction with eosinophilia and systemic symptoms. Part I. Epidemiology, pathogenesis, clinicopathological features, and prognosis. J. Am. Acad. Dermatology 90 (5), 885–908. doi:10.1016/j.jaad.2023.02.072

PubMed Abstract | CrossRef Full Text | Google Scholar

Zhang, H., Lau, W. C., and Hollenberg, P. F. (2012). Formation of the thiol conjugates and active metabolite of clopidogrel by human liver microsomes. Mol. Pharmacol. 82 (2), 302–309. doi:10.1124/mol.112.079061

PubMed Abstract | CrossRef Full Text | Google Scholar

Keywords: clopidogrel, drug-induced hypersensitivity syndrome, DRESS syndrome, percutaneous coronary intervention, dual antiplatelet therapy, stent thrombosis, indobufen

Citation: Wang S, Zhou J and Sun Y (2026) Clopidogrel-induced drug-induced hypersensitivity syndrome following percutaneous coronary intervention: a case report of therapeutic dilemma and management strategy. Front. Pharmacol. 16:1695177. doi: 10.3389/fphar.2025.1695177

Received: 29 August 2025; Accepted: 10 October 2025;
Published: 10 February 2026.

Edited by:

Mark Olah, Ohio Northern University, United States

Reviewed by:

Rodica Radu, Grigore T. Popa University of Medicine and Pharmacy, Romania
Brittany Bates, Ohio Northern University, United States

Copyright © 2026 Wang, Zhou and Sun. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Sikun Wang, MTYyNjMzNDI1MUBxcS5jb20=

These authors have contributed equally to this work and share first authorship

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.