An Efficacy and Safety of Proprietary Formulations of Oral Ketamine + Aspirin and Nurtec (Rimegepant) in Adult Patients Presenting to the ED With Acute Headache: Prospective, Randomized, Open-Label, Clinical Trial
Phase: PHASE4
Conditions: Pain
Sponsor: Antonios Likourezos

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TITLE:  
A comparison of Oral VTS-K (combination of VTS-Aspirin and oral 
ketamine) to Nurtec (Rimegepant) for managing acute headache in the ED: 
randomized, open-label, clinical trial. 
 
 
 
 
NCT#: 
 
 
 
Document Date: March 23, 2021 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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TITLE:  
A comparison of Oral VTS-K (combination of VTS-Aspirin and oral 
ketamine) to Nurtec (Rimegepant) for managing acute headache in the ED: 
randomized, open-label, clinical trial. 
 
 
 
INTRODUCTION 
 
Headaches affect over 50% of patients annually, with close to 4% of ED visits for headache. Most 
headaches managed in the ED are benign, with 90% of these headaches classified as tension, 
migraine, or cluster. At present, the satisfaction with ED treatment of headache is low, and despite 
the multitude of available medications, the evidence- based treatment options are often quite 
limited. There are over twenty different types of medications available to the ED clinicians for 
managing headache, many with different routes of administration (parenteral, intranasal, 
subcutaneous, and oral). Many of these medications are provided in so-called “headache 
cocktail”, which varies based on the physician, institution, and patient preferences. 
 
 
 
 
STUDY OBJECTIVES 
 
To compare analgesic efficacy and rates of side effects of a proprietary formulation of orally 
administered aspirin and ketamine (AOK) to a Nurtec ODT (Rimegepant) for pain management in 
adult ED patients presenting to the ED with acute headache. 
 
HYPOTHESIS  
 
We hypothesize that the administration of AOK will provide similar analgesia at 60 minutes post-
administration in comparison to Nurtec (Rimegeapant) in adult patients presenting to the ED with 
acute headache. The primary outcome of this trial is the difference in participant’s pain scores at 
60 minutes post-medication administration. 
 
STUDY DESIGN 
 
Subjects: Patients 18 years of age and older presenting to the ED with acute headache (defined as 
HA lasting no more than 1 week) and an initial pain score of 5 or more on a standard 11- point (0 
to 10) numeric rating scale and requiring oral analgesia as determined by the treating attending 
physician. Patients’ screening and enrollment will be performed by study investigators and 
research assistants. All patients will be enrolled at various times of the day when study 
investigators will be available for patient enrollment and an ED pharmacist will be available for 
medication preparation. 
 

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Eligibility Criteria: Patients 18 years of age and older presenting to the ED with acute headache 
(<7 days) and an initial pain score of 5 on a standard 11- point (0 to 10) numeric rating scale. 
Patients will have to be awake, alert, and oriented to person, place, and time, and will be able to 
demonstrate understanding of the informed consent process and content. Patients also will have to 
demonstrate ability to verbalize the nature of any adverse effects they might experience as well as 
to express their pain severity by using the NRS. 
  
Exclusion Criteria: Patients with altered mental status, allergy to aspirin, ketamine, rimegepant,  
pregnant patients, unstable vital signs (systolic blood pressure <90 or>180 mm Hg, pulse rate <50 
or >150 beats/min, and respiration rate <10 or >30 breaths/min), inability to provide consent, 
consumption of Aspirin/NSAID’s within 6 hours of arrival to the ED, or acetaminophen within 4 
hours of arrival to the ED, active PUD, history of GI Hemorrhage, history of renal and hepatic 
insufficiency, past medical history of alcohol or drug abuse, or schizophrenia, as well as clinical 
findings concerning  for acute intracranial process, acute infections process, or vascular 
catastrophe, pregnant patients and breastfeeding patients. 
 
Design: This is a prospective, randomized, open-label, equivalence trial comparing analgesic 
efficacy and safety of AOK and Nurtec (Rimegepant) in patients presenting to the ED of 
Maimonides Medical Center with acute headche. Upon meeting the eligibility criteria, patients 
will be randomized into one of the two study arms: Group I will receive AOK, and Group II will 
receive Nurtec 
 
Data Collection Procedures: Each patient will be approached by a study investigator for 
acquisition of written informed consent and Health Insurance Portability and Accountability Act 
authorization after being evaluated by the treating emergency physician and determined to meet 
study eligibility criteria. When English will not be the participant’s primary language, a language- 
appropriate consent form will be used and non-investigator, hospital-employed, trained 
interpreters or licensed telephone interpreter will assist in acquisition of informed consent.  
Baseline pain score will be determined with an 11-point numeric rating scale (0 to 10), described 
to the patient as “no pain” being 0 and “the worst pain imaginable” being 10. A study investigator 
will record the patient’s body weight and baseline vital signs. All data will be recorded on data 
collection sheets, including patients’ sex, demographics, medical history, and vital signs, and 
entered into SPSS (version 24.0; IBM Corp) by the research manager. Confirmation of written 
consent acquisition for all participants, and statistical analyses will be conducted by the statistician, 
who will work independently of any data collection. 
 
 
Data Analysis:  Data analyses will include frequency distributions and independent-sample t-test 
to assess differences in pain scores at the various intervals. Mixed-model linear regression will be 
used to compare changes in pain numeric rating scale across time points.  
For categorical outcomes (eg, complete resolution of pain), a X2 or Fisher’s exact test will be used 
to compare outcomes at 60 and 120 minutes. Based on the validation of a verbally administered 
rating scale of acute pain in the ED and the comparison of verbal and visual pain scales, we will 
use a primary outcome consisting of a minimal clinically meaningful difference of 2 points 
between two groups at the 60-minute and 120-minute pain assessment.28,29  
 

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Sample Size: Assuming the minimum statistically significant difference of 2 points on NRS, with 
Standard deviation of 3.0, alpha=0.05, and power of 80%, the sample size will require 40 patients 
per group. To account for potential loss to follow up (discharge form the ED before 120 minutes), 
we will enroll 45 patients in each group. 
 
Expected Outcomes: The primary outcome will include a comparative reduction of pain scores 
on numeric rating pain scale (NRS) at 60 minutes from the baseline. The secondary outcomes will 
include a need for rescue analgesia, rates of adverse effects, and change in pain score up to 120 
minutes.  
Adverse Events:   
With respect to unique adverse effects of ketamine, we will use Side Effect Rating Scale for 
Dissociative Anesthetics (SERSDA) and Richmond Agitation Sedation Scale (RASS) (ref) 
SERSDA Scale includes fatigue, dizziness, nausea, headache, feeling of unreality, changes in 
hearing, mood change, general discomfort, and hallucinations with severity of each graded by 
patients on a five-point scale, with “0” representing the absence of any adverse effects and “4” 
representing a severely bothersome side effect. RASS evaluates the severity of agitation and/or 
sedation in accordance with the nine-point scale with scores ranging from “−4” (deeply sedated) 
to “0” (alert and calm) to “+4” (combative).