A nurse is preparing to administer cefadroxil oral suspension to a client. The available concentration is cefadroxil 250 mg/5 mL. Which of the following actions should the nurse take first?

Choice A reason: Verifying the dose with the provider ensures accuracy but is secondary to safety checks. Cefadroxil, a cephalosporin, can cause allergic reactions, and unverified doses may lead to errors, but checking allergies first prevents life-threatening anaphylaxis, prioritizing patient safety before confirming dosage accuracy. Choice B reason: Shaking the cefadroxil suspension ensures uniform drug distribution, as particles settle in liquid formulations. This ensures accurate dosing but is not the first step, as administering to an allergic client risks severe immune responses, making allergy history verification the priority to ensure safety. Choice C reason: Measuring with a calibrated syringe ensures precise dosing of cefadroxil, critical for therapeutic efficacy. However, this follows safety checks, as administering to an allergic client risks anaphylaxis, a rapid immune response involving histamine release, making allergy history verification the critical first step before measurement. Choice D reason: Checking allergy history is the first step, as cefadroxil, a cephalosporin, may cause anaphylaxis in penicillin-allergic clients due to cross-reactivity. Allergic reactions involve immunoglobulin E-mediated histamine release, causing bronchospasm or hypotension. Verifying allergies prevents life-threatening reactions, ensuring safe administration before other steps like dosing or shaking.