Intravenous Lidocaine Randomized Comparative Effectiveness Trial

Inclusion Criteria:Eligible patients are those who present to an ED for treatment of acute abdominal pain. Acute will be defined as pain for no more than seven days. At the time of enrollment, the ED treatment plan must include use of an intravenous opioid. Exclusion Criteria: Patients will be excluded from participation if they have cardiac conduction system impairment (QTc duration \> 0.5s, QRS duration \> 0.12s, or PR interval duration \> 0.2s), known renal (CKD \>2) or liver disease (Childs-Pugh B or greater), are hemodynamically unstable, as determined by the attending physician, are pregnant or breastfeeding, or have a known allergy to either medication. Patients will also be excluded if they have used prescription or illicit opioids within the previous week, or if they have a chronic pain disorder, defined as use of any analgesic medication on more days than not during the month preceding the acute episode of pain. Patients weighing \< 60kg or \> 120kg will be excluded. \-