# Diphenhydramine as an Adjunctive Sedative in Patients on Chronic Opioids

> **NCT01967433** · PHASE4 · COMPLETED · sponsor: **University of Oklahoma** · enrollment: 120 (actual)

## Conditions studied

- Colonoscopy
- Adjunct Anesthesia Medication

## Interventions

- **DRUG:** Diphenhydramine
- **DRUG:** Placebo

## Key facts

- **NCT ID:** NCT01967433
- **Lead sponsor:** University of Oklahoma
- **Sponsor class:** OTHER
- **Phase:** PHASE4
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2013-12
- **Primary completion:** 2018-03
- **Final completion:** 2018-07
- **Target enrollment:** 120 (ACTUAL)
- **Last updated:** 2020-03-11


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT01967433

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT01967433, "Diphenhydramine as an Adjunctive Sedative in Patients on Chronic Opioids". Retrieved via AI Analytics 2026-05-27 from https://api.ai-analytics.org/clinical/NCT01967433. Licensed CC0.

---

*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*