Alternate Pre-med in Anti-Cluster of Differentiation 20 (CD20) Pilot Project

Inclusion Criteria: * Ages ≥18 years * Able to read and speak in English or Spanish * Able to and willing to give informed consent * Diagnosis of Multiple Sclerosis (MS) * Patients starting or currently receiving ocrelizumab, ublituximab, rituximab Exclusion Criteria: * Adults unable or unwilling to consent * Patients younger than 18 years of age * Pregnant women * Known hypersensitivity to cetirizine or any of its ingredients or hydroxyzine * Moderate or severe renal impairment (creatinine clearance or 11-31 mL/min or worse) * Patients with prior hypersensitivity reactions on additional preventative measures (e.g. H1 and H2/proton-pump inhibitor (PPI) the night prior to the infusion due to history of reactions)