The nurse informs the patient to remain well hydrated while taking lithium because dehydration can lead to:

A. Atorvastatin (Lipitor) is a statin medication that works by inhibiting the enzyme HMG-CoA reductase, which plays a key role in cholesterol synthesis in the liver, thereby lowering cholesterol levels.

B. Atorvastatin's mechanism of action is well understood; it is not accurate to say its action is not understood.

C. Atorvastatin does not bind to cholesterol; instead, it inhibits its production in the liver.

D. Atorvastatin does not directly cause the body to excrete cholesterol but rather reduces its production in the liver.

A. Placing three tablets under the tongue at once is not the recommended initial dosing for nitroglycerin.

B. Nitroglycerin tablets should not be swallowed; they are meant to be taken sublingually (under the tongue) for quick absorption.

C. This is the correct instruction, reflecting the standard protocol for acute angina treatment with nitroglycerin: one tablet under the tongue every 5 minutes as needed, with no more than three tablets in 15 minutes. If pain persists, it is advised to call emergency services.

D. This instruction is inappropriate as it delays immediate treatment for chest pain, which can be critical in the event of acute angina or a heart attack.