Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Penicillin Allergy: early-phase trial registry
2 of 4 indexed Penicillin Allergy trials are currently recruiting, with more weight in Phase 1-2.
Corpus placement: #4,115 of 28,707 conditions by registered trial count.
4 US clinical trials · 2 currently recruiting · #4,115 of 28,707 conditions by registered trial count
Penicillin Allergy: 4 US clinical trials tracked, 2 recruiting.
Penicillin Allergy is the subject of 4 registered US clinical trials on ClinicalTrials.gov, 2 of them currently open to new participants. 1 are in Phase 3-4 (later-stage) and 2 in Phase 1-2 (earlier-stage). The most active sponsor is James Tarbox, MD, running 1 of these trials.
Enrollment posture brief
Registry condition penicillin-allergy
OPEN 2 | RECR 50% | LATE 1 | EARLY 2 | RANK #4115 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Abdominal Aortic Aneurysms (50% recruiting · 6 trials)
Penicillin Allergy lists 2 open slots (50% of 4 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Penicillin Allergy on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Penicillin Allergy is recruiting above its size-band peers.
2 of 4 indexed trials (50%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
Open and recent trials
4 total, page 1 of 1
Penicillin Allergy Delabeling After a One-Dose Versus Two-Dose Graded Direct Oral Challenge
James Tarbox, MD
NCT06303128
Geisinger Antibiotic Allergy Pilot Program: Assess and Address
Geisinger Clinic
NCT05464615
Drug Challenges Without Prior Skin Testing
Montefiore Medical Center
NCT03158831
Feasibility Assessment of Risk Stratification and Oral Challenge in Hospitalized Children at Low Risk for Antibiotic Allergy
Vanderbilt University Medical Center
NCT04441021
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 2 |
| Phase 3 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Penicillin Allergy records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Penicillin Allergy trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Penicillin Allergy page
4 registered trials, 2 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 2 Penicillin Allergy trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- James Tarbox, MD sponsors the most Penicillin Allergy trials on record, review their full trial history before evaluating a specific study. See James Tarbox, MD's trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Penicillin Allergy condition card totals 4 registered trials; most-linked intervention Placebo-Controlled Graded Drug Challenge; top US site state Texas. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.