A client diagnosed with strep throat requires antibiotics for treatment. With an allergy to penicillin, the nurse understands which medication should be avoided due to cross-sensitivity with penicillin medications?

Choice A reason: Benzodiazepines are a class of medications used primarily for anxiety, insomnia, and seizures. They are not antibiotics and do not have cross-sensitivity with penicillin, so they are irrelevant to this context. Choice B reason: Tetracyclines are a class of antibiotics used to treat various bacterial infections. They do not have cross-sensitivity with penicillin, so they are safe alternatives for patients allergic to penicillin. Choice C reason: Cephalosporins are a class of antibiotics that can have cross-sensitivity with penicillin. Approximately 5-10% of people allergic to penicillin may also react to cephalosporins due to structural similarities. Therefore, these should be used with caution or avoided in patients with penicillin allergies. Choice D reason: Sulfonamides are a different class of antibiotics and do not have cross-sensitivity with penicillin. They can be safely used in patients with penicillin allergies unless the patient has a specific allergy to sulfonamides.