Correct Answer: A

Rationale: Acetaminophen is known to lose its effectiveness in controlling pain beyond a dosage of 1,000 mg. It is important to adhere to recommended dosages to ensure optimal pain relief and avoid potential adverse effects associated with higher doses.

Correct Answer: D

Rationale: Propranolol exerts its pharmacological action by blocking stimulation of both beta1 and beta2 receptors. By doing so, it leads to decreased heart rate and blood pressure. Therefore, both options A and C are correct as propranolol affects both types of beta receptors.

Correct Answer: A

Rationale: Lidocaine is administered to prevent dysrhythmias by delaying conduction in the heart and reducing the automaticity of heart tissue. This action helps stabilize the heart's electrical activity and prevent life-threatening arrhythmias post-cardiac arrest.

Correct Answer: C

Rationale: Ataxia is a sign of CNS toxicity, which can be a severe adverse effect of Metronidazole.

Correct Answer: A

Rationale: A common side effect of Albuterol is paradoxical bronchospasm, a condition where the airways become more constricted instead of relaxing, which can be a serious adverse reaction to the medication.