Which of the following adverse reactions to penicillin correlates directly with the administered dosage___________?
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Answer: D. Encephalopathy
Explanation
Penicillin-induced encephalopathy is a dose-dependent neurotoxic adverse drug reaction. Extremely high serum levels allow the antibiotic to penetrate the blood-brain barrier. Excessive drug concentrations in the central nervous system trigger abnormal neuronal hyperexcitability. Neurotoxicity can occur when massive intravenous doses of beta-lactam antibiotics are administered. The blood-brain barrier normally restricts entry of polar molecules into central neural tissues. Renal impairment can inadvertently lead to drug accumulation and subsequent neurological toxicity.
Patients with kidney disease require careful dosage reductions to prevent drug accumulation toxicity. Seizures and confusion can manifest if antibiotic dosing exceeds safe neurological thresholds. Clinical awareness of dose-dependent adverse effects improves patient safety during high-dose therapy. Skin rash represents an immune-mediated hypersensitivity reaction independent of administered dosage. Interstitial nephritis is an allergic idiosyncratic response rather than a direct dose-dependent effect. Drug fever is an immunological hypersensitivity phenomenon not directly correlated with total dose.
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