Study Evaluating the Safety and Efficacy of Neffy or Intramuscular Adrenalin in Patients With Allergic Reactions After Oral Food Challenge or Allergen Immunotherapy

Inclusion Criteria: * Is a patient 4 years old or greater, inclusive, who are scheduled to undergo OFC, AIT, or other relevant allergy challenge. * Has body weight 15 kg or greater at the time of allergy challenge. * Is willing and able to provide written informed consent prior to participating in the study. In the case of minors (\<18 years old), assent can be obtained from his/her legal representative, and as much possible from the patient himself/herself. * Patient experiences an allergic reaction that, in the opinion of the Investigator, requires treatment with epinephrine via neffy or IM Adrenalin. Exclusion Criteria: \- Has any clinically significant medical condition that precludes treatment with epinephrine as assessed by the Investigator.