{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T17:07:26Z","timestamp":1789664846439,"version":"4.0.1"},"reference-count":53,"publisher":"Oxford University Press (OUP)","issue":"10","license":[{"start":{"date-parts":[[2025,5,6]],"date-time":"2025-05-06T00:00:00Z","timestamp":1746489600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100016220","name":"CTSA","doi-asserted-by":"publisher","award":["UL1 TR002243"],"award-info":[{"award-number":["UL1 TR002243"]}],"id":[{"id":"10.13039\/100016220","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006108","name":"National Center for Advancing Translational Sciences","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006108","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,10,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>Trigeminal neuralgia and painful trigeminal neuropathy are severely painful conditions which are often difficult to treat with medications. A Phenome-Wide Association Study (PheWAS) analysis identified an association between single-nucleotide variants in the alpha-2 adrenergic receptor (ADRA2) subtype B, a G protein-coupled receptor expressed on peripheral and central presynaptic terminals, and an increased risk for trigeminal nerve disorders. We hypothesized that adding the ADRA2 agonist guanfacine to routine care trigeminal nerve injections would provide enhanced pain relief in trigeminal neuralgia than routine care alone.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>PheWAS analysis identified the drug target\/indication pair. The trial was a single-center, prospective, randomized, controlled, double-blinded, 2-way crossover trial for patients with pain attributed to the trigeminal nerve. Injections of lidocaine alone or lidocaine + 250\u2009\u00b5g guanfacine were delivered to the V2 and V3 branches of the trigeminal nerve by experienced clinicians. Patients reported pain using a Numeric Rating Scale (NRS) and quality of life measures (using the PROMIS Global Physical Health, Mental Health, and Pain Interference surveys).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>NRS pain scores over the first 8\u2009h post-injection were significantly lower in the interventional group (guanfacine + lidocaine) compared to active control (P\u2009&amp;lt;\u2009.001), but not from day 1 through day 14. There was no significant difference between treatment groups in time to recovery of baseline pain intensity (primary outcome), PROMIS outcomes, or adverse events (AEs). No serious AEs were reported.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>The addition of 250\u2009\u00b5g guanfacine to lidocaine for a nerve block procedure enhanced analgesia compared to lidocaine alone within the first 8\u2009h post-injection.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Clinical Trial Number<\/jats:title>\n                  <jats:p>NCT03865940, https:\/\/clinicaltrials.gov\/study\/NCT03865940<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/pm\/pnaf054","type":"journal-article","created":{"date-parts":[[2025,5,6]],"date-time":"2025-05-06T08:08:55Z","timestamp":1746518935000},"page":"643-654","source":"Crossref","is-referenced-by-count":1,"title":["Enhanced pain relief with guanfacine as an adjuvant for trigeminal nerve blocks: insights from a PheWAS-guided randomized controlled study"],"prefix":"10.1093","volume":"26","author":[{"given":"Shelby E","family":"Meier","sequence":"first","affiliation":[{"name":"Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, Nashville, TN 37203-8820,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael B","family":"Orr","sequence":"additional","affiliation":[{"name":"Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, Nashville, TN 37203-8820,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew S","family":"Shotwell","sequence":"additional","affiliation":[{"name":"Department of Biostatistics, Vanderbilt University Medical Center , Nashville, TN 37203-1741,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca N","family":"Jerome","sequence":"additional","affiliation":[{"name":"Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, Nashville, TN 37203-8820,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jana K","family":"Shirey-Rice","sequence":"additional","affiliation":[{"name":"Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, Nashville, TN 37203-8820,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jill M","family":"Pulley","sequence":"additional","affiliation":[{"name":"Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, Nashville, TN 37203-8820,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David A","family":"Edwards","sequence":"additional","affiliation":[{"name":"Division of Pain Medicine, Department of Anesthesiology, Vanderbilt University Medical Center , Nashville, TN 37204,","place":["United 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