Medical College of Wisconsin
CTSIResearch InformaticsREDCap

Ryan J. Feldman PharmD

Adjunct Associate Professor

Institution: Medical College of Wisconsin
Department: School of Pharmacy Operations


I am willing to collaborate on research projects.

View Curriculum Vitae

Publications (64)

  • Changes in Exposures of US Children Ages 12 and Under to Cannabis from 2000 to 2024. (Bertino RE, Feldman R, Leikin JB) J Addict Med 2026 Jun 26 PMID: 42359703 SCOPUS ID: 2-s2.0-105048695389 06/27/2026    
  • Role of the Emergency Medicine Pharmacist in the Management of Boarding Patients: An Opinion of the Emergency Medicine Practice and Research Network of the American College of Clinical Pharmacy Endorsed by the SAEM Academy of Emergency Medicine Pharmacists and the Society of Emergency Medicine Pharmacists. (Gilbert BW, Zimmerman DE, Robertson A, Jones GD, Gendron BJ, Corio JL, Harlan SS, Engstrom K, Maisenbach A, Rambaran KA, Mercer KJ, Feldman R, Geier C, Truoccolo DS, Weant KA, Blue H) J Am Coll Clin Pharm 2026 Jun;9(6):e70227 PMID: 42161376 SCOPUS ID: 2-s2.0-105039509031 05/21/2026    
  • A 25-year analysis of Armillaria (honey mushroom) poisoning in Wisconsin. (Feldman R, Audette M, Leacock PR, Theobald J) Am J Emerg Med 2026 Aug;106:62-68 PMID: 42066652 SCOPUS ID: 2-s2.0-105037189798 05/02/2026    
  • Optimization of benzodiazepine use for status epilepticus in the emergency department. (O'Keefe M, Feih J, Feldman R, Stanton M, Dang CH) Am J Emerg Med 2026 Jul;105:115-119 PMID: 42013624 SCOPUS ID: 2-s2.0-105036019127 04/22/2026    
  • Association between state-level kratom regulations and poison center-reported severe medical outcomes and healthcare use: A United States national analysis. (Comstock G, Gulotta AP, Rein LE, Feldman R) Addiction 2026 Sep;121(9):2457-2467 PMID: 42015466 PMCID: PMC13486930 SCOPUS ID: 2-s2.0-105036436298 04/22/2026       1 Citation
  • Lidocaine for diphenhydramine-induced ventricular tachycardia: A case report. (Carroll S, McGee M, Audette M, Tuttle M, Corcoran J, Stanton M, Feldman R) Am J Emerg Med 2026 Apr;102:131-134 PMID: 41610479 SCOPUS ID: 2-s2.0-105028454988 01/30/2026    
  • Pharmacologic and toxicologic confounders in brain death determination: a multidisciplinary guide. (Farrokh S, Cook A, Feldman R, George P, Sarwal A, Mirski M, Shah V) Crit Care 2026 Jan 20;30(1):77 PMID: 41559743 PMCID: PMC12895928 SCOPUS ID: 2-s2.0-105029854224 01/21/2026    
  • Evaluating the Role of Erythrocyte-Related Markers in Predicting Adenosine Response in Supraventricular Tachycardia. (Carroll S, Soter K, McGee M, Rein LE, McGurk K, Feldman R) Ann Pharmacother 2026 Sep;60(9):872-877 PMID: 41547655 SCOPUS ID: 2-s2.0-105027592751 01/18/2026       1 Citation
  • 2024 Annual report of the National Poison Data System® (NPDS) from America's Poison Centers®: 42nd annual report. (Beuhler MC, Feldman R, Gummin DD, Mowry JB, Rivers LJ, Brown K, Pham NPT, Johnson-O'Leary K, Spyker DA, Bronstein AC) Clin Toxicol (Phila) 2025 Dec;63(12):1029-1280 PMID: 41432769 SCOPUS ID: 2-s2.0-105025600140 12/23/2025       28 Citations
  • Can Albumin Trap Salicylate? An In Vitro Exploration of Salicylate Overdose Scenarios. (Feldman R, Gummin D, Hawi M, Lyneis J, Abourashed E) J Med Toxicol 2026 Jan;22(1):29-38 PMID: 41413367 PMCID: PMC12835468 SCOPUS ID: 2-s2.0-105025361844 12/19/2025       1 Citation
  • Hyperglycemia and Severe Medical Outcomes in Calcium Channel Blocker Exposures Reported to United States Poison Centers. (Brenner MA, Zosel AE, Feldman RJ, Stanton MT) WMJ 2025;124(4):333-337 PMID: 41197050 SCOPUS ID: 2-s2.0-105021068256 11/06/2025    
  • Neuromuscular junction toxins. (Randall MC, Feldman R) Dis Mon 2025 Aug;71(8):101972 PMID: 40541463 SCOPUS ID: 2-s2.0-105008826966 06/21/2025       2 Citations
  • Outcomes of benzonatate exposures reported to a single United States poison center: a 20-year review. (Cicci CD, Theobald J, Stanton M, Feldman R) Clin Toxicol (Phila) 2025 Jul;63(7):488-494 PMID: 40511470 SCOPUS ID: 2-s2.0-105009524310 06/13/2025    
  • Toxicology updates in emergency medicine. (Feldman R, Lund J, Rivera Pescatore J, Stanton M) Am J Health Syst Pharm 2025 Dec 05;82(24):1362-1376 PMID: 40459339 SCOPUS ID: 2-s2.0-105024016373 06/03/2025       2 Citations
  • From policy to practice: Implementation of emergency medicine pharmacist medication administration. (Guidos J, Singh R, Smith A, Feldman R) Am J Health Syst Pharm 2025 Dec 16;83(1):e27-e37 PMID: 40452555 SCOPUS ID: 2-s2.0-105025002239 06/02/2025       1 Citation
  • CuratED: The emergency medicine pharmacotherapy literature of 2024. (Feldman R, Faine B, Rech MA, Zimmerman DE, Flack T, Howington GT, Laub J, Porter B, Slocum GW, Zepeski A, Santiago RD, Woolum J, Krenz J, Sarangarm P, Koehl J) Am J Emerg Med 2025 Jul;93:146-153 PMID: 40203497 SCOPUS ID: 2-s2.0-105001998218 04/10/2025       1 Citation
  • Engaging Pharmacists in Strategies for Navigating Prescription Drug Costs. (Feldman R, Hovis Z, Rech MA) JAMA 2025 Apr 08;333(14):1261 PMID: 40063043 SCOPUS ID: 2-s2.0-105001543767 03/10/2025       1 Citation
  • Ivabradine exposures reported to United States poison centers 2015-2023. (Szczesniak L, Thornton S, Feldman R, Corcoran J) Clin Toxicol (Phila) 2025 Apr;63(4):278-283 PMID: 39991866 SCOPUS ID: 2-s2.0-85218696929 02/24/2025       1 Citation
  • Utility of iron concentration two to four hours post ingestion in predicting toxicity (Fox H, Jansen A, Theobald J, Stanton M, Feldman R) American Journal of Emergency Medicine January 2025;87:70-73 SCOPUS ID: 2-s2.0-85208142108 01/01/2025       1 Citation
  • Ivabradine exposures reported to United States poison centers 2015–2023 (Szczesniak L, Thornton S, Feldman R, Corcoran J) Clinical Toxicology 2025;63(4):278-283 SCOPUS ID: 2-s2.0-85218696929 01/01/2025       1 Citation
  • 2023 Annual Report of the National Poison Data System® (NPDS) from America's Poison Centers®: 41st Annual Report. (Gummin DD, Mowry JB, Beuhler MC, Spyker DA, Rivers LJ, Feldman R, Brown K, Pham NPT, Bronstein AC, DesLauriers C) Clin Toxicol (Phila) 2024 Dec;62(12):793-1027 PMID: 39688840 SCOPUS ID: 2-s2.0-85212221988 12/17/2024       103 Citations
  • Causes of Mortality From Acute Carbon Monoxide Exposure: A Step Towards Preventative Long-Term Care? (Feldman R, Rech MA) Crit Care Med 2024 Dec 01;52(12):1973-1976 PMID: 39637264 SCOPUS ID: 2-s2.0-85211830787 12/05/2024    
  • Cephalosporins for Outpatient Pyelonephritis in the Emergency Department: COPY-ED Study. (Koehl J, Spolsdoff D, Negaard B, Lewis A, Santiago R, Krenz J, Polotti A, Feldman R, Slocum G, Zimmerman D, Howington GT, Sarangarm P, Mattson AE, Brown C, Zepeski A, Rech MA, Faine B) Ann Emerg Med 2025 Mar;85(3):240-248 PMID: 39570254 SCOPUS ID: 2-s2.0-85209687914 11/21/2024       8 Citations
  • Utility of iron concentration two to four hours post ingestion in predicting toxicity. (Fox H, Jansen A, Theobald J, Stanton M, Feldman R) Am J Emerg Med 2025 Jan;87:70-73 PMID: 39509998 SCOPUS ID: 2-s2.0-85208142108 11/13/2024       1 Citation
  • Back Pedaling on Baclofen: Highlighting Concerns Surrounding Baclofen use in Phenibut Withdrawal (Feldman R) Journal of Clinical Pharmacology September 2024;64(9):1181-1182 SCOPUS ID: 2-s2.0-85193037053 09/01/2024    
  • Lack of toxicity after simultaneous application of 17 lidocaine 4% patches. (Sterr J, Bhagat G, Feldman R) Clin Toxicol (Phila) 2024 Sep;62(9):605-606 PMID: 39105469 SCOPUS ID: 2-s2.0-85200460565 08/06/2024    
  • EDucated: The emergency medicine pharmacotherapy literature of 2023 (Koehl J, Brown CS, Faine B, Rech MA, Zimmerman DE, Flack T, Gilbert BW, Howington GT, Laub J, Porter B, Slocum GW, Zepeski A, Feldman R, Santiago RD, Sarangarm P) American Journal of Emergency Medicine August 2024;82:166-173 SCOPUS ID: 2-s2.0-85196553078 08/01/2024       2 Citations
  • A national survey of medication utilization for cardiac resuscitation in the emergency department: A survey of emergency medicine pharmacists. (Ray L, Acquisto NM, Coralic Z, Feldman R, Mercer K, Zimmerman DE, Howington GT, Slocum GW, Faine B, Rech MA) Am J Health Syst Pharm 2024 Dec 05;81(24):1313-1321 PMID: 38990863 SCOPUS ID: 2-s2.0-85212457348 07/11/2024       2 Citations
  • EDucated: The emergency medicine pharmacotherapy literature of 2023. (Koehl J, Brown CS, Faine B, Rech MA, Zimmerman DE, Flack T, Gilbert BW, Howington GT, Laub J, Porter B, Slocum GW, Zepeski A, Feldman R, Santiago RD, Sarangarm P) Am J Emerg Med 2024 Aug;82:166-173 PMID: 38909552 SCOPUS ID: 2-s2.0-85196553078 06/24/2024       2 Citations
  • Back Pedaling on Baclofen: Highlighting Concerns Surrounding Baclofen use in Phenibut Withdrawal. (Feldman R) J Clin Pharmacol 2024 Sep;64(9):1181-1182 PMID: 38752524 SCOPUS ID: 2-s2.0-85193037053 05/16/2024    
  • Reader Response: Pediatric and Adult Brain Death/Death by Neurologic Criteria Consensus Guideline: Report of the AAN Guidelines Subcommittee, AAP, CNS, and SCCM. (Feldman R, Theobald J, Stanton M, Stolbach A, Tormoehlen L) Neurology 2024 May 14;102(9):e209363 PMID: 38648601 SCOPUS ID: 2-s2.0-85191498478 04/23/2024    
  • A Narrative Review of Aconite Poisoning and Management. (Lawson C, McCabe DJ, Feldman R) J Intensive Care Med 2025 Aug;40(8):811-817 PMID: 38613376 SCOPUS ID: 2-s2.0-85190449363 04/13/2024       10 Citations
  • Trimeresurus insularis (blue Indonesian pit viper) envenomation treated with Thai green pit viper antivenom. (Feldman R, Stanton M, Corcoran J, Bialkowski K, Theobald J, Gummin D) Clin Toxicol (Phila) 2024 Mar;62(3):207-209 PMID: 38525877 SCOPUS ID: 2-s2.0-85188549470 03/25/2024       1 Citation
  • Part I: Case series: Acute management of prescription and nonprescription drug overdoses (Feldman R, Leonard J) Jaccp Journal of the American College of Clinical Pharmacy March 2024;7(3):282-304 SCOPUS ID: 2-s2.0-85188135813 03/01/2024    
  • A systematic review of phenibut withdrawal focusing on complications, therapeutic approaches, and single substance versus polysubstance withdrawal. (Feldman R, Autry B, Dukes J, Lofy T, Marchetti G, Patt A, Batterman N, Theobald J) Clin Toxicol (Phila) 2023 Nov;61(11):941-951 PMID: 38112312 SCOPUS ID: 2-s2.0-85180420727 12/19/2023       6 Citations
  • 2022 Annual Report of the National Poison Data System® (NPDS) from America's Poison Centers®: 40th Annual Report. (Gummin DD, Mowry JB, Beuhler MC, Spyker DA, Rivers LJ, Feldman R, Brown K, Pham NPT, Bronstein AC, DesLauriers C) Clin Toxicol (Phila) 2023 Oct;61(10):717-939 PMID: 38084513 SCOPUS ID: 2-s2.0-85179647599 12/12/2023       204 Citations
  • Outcomes of pediatric ingestions of alcohol-based hand sanitizers during the COVID-19 pandemic. (Corcoran J, Feldman R, Theobald J) Clin Toxicol (Phila) 2023 Aug;61(8):613-615 PMID: 37725079 SCOPUS ID: 2-s2.0-85171690214 09/19/2023       1 Citation
  • Lack of Association of Initial Vasopressor Dosing with Survival and Cardiac Re-Arrest Likelihood After Return of Spontaneous Circulation. (Sharpe AR, Richardson K, Stanton M, Dang C, Feih J, Brazauskas R, Teng BQ, Feldman R) J Emerg Med 2023 Sep;65(3):e209-e220 PMID: 37635036 SCOPUS ID: 2-s2.0-85169781378 08/28/2023       3 Citations
  • Can Metronidazole Cause a Disulfiram-Like Reaction? A Case-Control Study Propensity Matched by Age, Sex, and Ethanol Concentration. (Feldman R, Jaszczenski R) WMJ 2023 Jul;122(3):171-177 PMID: 37494646 SCOPUS ID: 2-s2.0-85165930236 07/26/2023       8 Citations
  • Incidence of rebound salicylate toxicity following cessation of urine alkalinization. (O'Keefe M, Stanton M, Feldman R, Theobald J) Clin Toxicol (Phila) 2023 Jul;61(7):536-542 PMID: 37427892 SCOPUS ID: 2-s2.0-85164747657 07/10/2023       1 Citation
  • Seizure Occurring During Baclofen Monotherapy for Phenibut Withdrawal. (Patt A, Fox H, Wells L, Theobald J, Feldman R) Clin Neuropharmacol 2023 Mar-Apr 01;46(2):79-81 PMID: 36735548 SCOPUS ID: 2-s2.0-85150170759 02/04/2023       5 Citations
  • 2021 Annual Report of the National Poison Data System© (NPDS) from America's Poison Centers: 39th Annual Report. (Gummin DD, Mowry JB, Beuhler MC, Spyker DA, Rivers LJ, Feldman R, Brown K, Nathaniel PTP, Bronstein AC, Weber JA) Clin Toxicol (Phila) 2022 Dec;60(12):1381-1643 PMID: 36602072 SCOPUS ID: 2-s2.0-85145526169 01/06/2023       195 Citations
  • Outcomes of pediatric ingestions of alcohol-based hand sanitizers during the COVID-19 pandemic (Corcoran J, Feldman R, Theobald J) Clinical Toxicology 2023;61(8):613-615 SCOPUS ID: 2-s2.0-85171690214 01/01/2023       1 Citation
  • Excess baggage in describing acetylcysteine regimens. (Stanton M, Feldman R, Gummin D) Clin Toxicol (Phila) 2023 Jan;61(1):88-89 PMID: 36484497 SCOPUS ID: 2-s2.0-85143643212 12/10/2022       2 Citations
  • Ventricular fibrillation in a 21-year-old after inhalation of an isobutyl nitrite "popper" product. (Gooley B, Lofy T, Gross J, Sonnenberg T, Feldman R) Am J Emerg Med 2023 Feb;64:204.e5-204.e7 PMID: 36369048 SCOPUS ID: 2-s2.0-85141488454 11/12/2022       7 Citations
  • Intracranial hemorrhage after a single dose of Yohimbine in a chronic user of clonidine. (Hodapp B, Haggerty A, Feldman R, Timpe J) Am J Emerg Med 2022 Dec;62:145.e1-145.e4 PMID: 36115742 SCOPUS ID: 2-s2.0-85137857704 09/18/2022       7 Citations
  • Hemodialysis enhances elimination of ethosuximide in massive overdose. (Wells L, Stanton M, Gummin DD, Brooks M, Feldman R) Clin Toxicol (Phila) 2022 Sep;60(9):1078-1079 PMID: 35894638 SCOPUS ID: 2-s2.0-85135010929 07/28/2022    
  • A case of early chelation therapy in a potentially lethal mercuric chloride ingestion. (Fox H, Farkas A, Rukamp N, Feldman R) Clin Toxicol (Phila) 2022 Sep;60(9):1076-1078 PMID: 35876485 SCOPUS ID: 2-s2.0-85134641355 07/26/2022    
  • Accidental Occupational Exposure to a Large Volume of Liquid Fentanyl on a Compromised Skin Barrier with No Resultant Effect. (Feldman R, Weston BW) Prehosp Disaster Med 2022 Aug;37(4):550-552 PMID: 35722948 SCOPUS ID: 2-s2.0-85134426255 06/21/2022       8 Citations
  • Impact of timing and dosing of four-factor prothrombin complex concentrate administration on outcomes in warfarin-associated intracranial hemorrhage. (Cicci CD, Weiss A, Dang C, Stanton M, Feldman R) Pharmacotherapy 2022 May;42(5):366-374 PMID: 35384000 SCOPUS ID: 2-s2.0-85128929968 04/07/2022       7 Citations
  • Combining simulated academic detailing with naloxone training to prepare student pharmacists for opioid risk mitigation strategies. (Kavanaugh R, Yerks M, Feldman R, Stanton M) Curr Pharm Teach Learn 2021 Dec;13(12):1679-1682 PMID: 34895678 SCOPUS ID: 2-s2.0-85118801435 12/14/2021       2 Citations
  • Hemolysis after subcutaneous deoxycholic acid overdose. (Sharpe A, O'Keefe M, Windsor K, Theobald J, Feldman R) Am J Emerg Med 2022 Feb;52:268.e1-268.e2 PMID: 34456101 SCOPUS ID: 2-s2.0-85113786357 08/31/2021       3 Citations
  • Comparison of Clinical Outcomes with Initial Norepinephrine or Epinephrine for Hemodynamic Support After Return of Spontaneous Circulation. (Weiss A, Dang C, Mabrey D, Stanton M, Feih J, Rein L, Feldman R) Shock 2021 Dec 01;56(6):988-993 PMID: 34172611 SCOPUS ID: 2-s2.0-85121958294 06/27/2021       19 Citations
  • Compiling Evidence for EVALI: A Scoping Review of In Vivo Pulmonary Effects After Inhaling Vitamin E or Vitamin E Acetate. (Feldman R, Stanton M, Suelzer EM) J Med Toxicol 2021 Jul;17(3):278-288 PMID: 33528766 PMCID: PMC8206445 SCOPUS ID: 2-s2.0-85100353209 02/03/2021       11 Citations
  • Choosing a Vasopressor for a Prehospital Emergency Medical System: Consideration for Agent Selection and Review of Pharmacologic Profiles, Efficacy, and Safety in Treatment of Shock. (Feldman R, Stanton M, Chinn M, Grawey T, Weston B) WMJ 2020 Dec;119(4):240-247 PMID: 33428833 SCOPUS ID: 2-s2.0-85099890579 01/12/2021       4 Citations
  • National assessment of pharmacist awareness of loperamide abuse and ability to restrict sale if abuse is suspected. (Feldman R, Everton E) J Am Pharm Assoc (2003) 2020;60(6):868-873 PMID: 32641253 SCOPUS ID: 2-s2.0-85087483047 07/10/2020       4 Citations
  • Culprit or correlate? An application of the Bradford Hill criteria to Vitamin E acetate. (Feldman R, Meiman J, Stanton M, Gummin DD) Arch Toxicol 2020 Jun;94(6):2249-2254 PMID: 32451600 SCOPUS ID: 2-s2.0-85085053459 05/27/2020       10 Citations
  • Involvement of pharmacist-reviewed urine cultures and sexually transmitted infections in the emergency department reduces time to antimicrobial optimization. (Olson A, Feih J, Feldman R, Dang C, Stanton M) Am J Health Syst Pharm 2020 May 19;77(Supplement_2):S54-S58 PMID: 32426834 SCOPUS ID: 2-s2.0-85084786424 05/20/2020       17 Citations
  • Chapter: Smoke Inhalations and Toxic Exposures. In: PSAP 2020 Book 1 Critical and Urgent Care. (Oltrogge Pape K, Feldman R.) 01/01/2020    
  • Feldman, R. Chapter 7. The use of drugs under pressure. in: Kindwall, E; Whelan, H. Hyperbaric Medicine Practice 4th ed. Flagstaff, AZ: Best Publishing Company; 2017, p. 131-159. 08/06/2019    
  • Feldman R, Daniels A. Elizabethkingia endovascular infection. Society of Infectious Disease Pharmacist newsletter. 08/06/2019    
  • Medical outcomes of bromethalin rodenticide exposures reported to US poison centers after federal restriction of anticoagulants. (Feldman R, Stanton M, Borys D, Kostic M, Gummin D) Clin Toxicol (Phila) 2019 Nov;57(11):1109-1114 PMID: 30892957 SCOPUS ID: 2-s2.0-85063130949 03/21/2019       8 Citations
  • Severe lead toxicity attributed to bullet fragments retained in soft tissue. (Weiss D, Lee D, Feldman R, Smith KE) BMJ Case Rep 2017 Mar 08;2017 PMID: 28275014 PMCID: PMC5353372 SCOPUS ID: 2-s2.0-85015243781 03/10/2017       15 Citations
  • Treatment of Paecilomyces variotii pneumonia with posaconazole: case report and literature review. (Feldman R, Cockerham L, Buchan BW, Lu Z, Huang AM) Mycoses 2016 Dec;59(12):746-750 PMID: 27401982 SCOPUS ID: 2-s2.0-84978191719 07/13/2016       29 Citations
    • Last update: 08/06/2026