Final answer:
The successful teaching of lithium carbonate (Lithane) can be determined by the client statement acknowledging the need to contact their doctor if they experience diarrhea or ringing in their ears.
Step-by-step explanation:
The nurse would consider the teaching on lithium carbonate (Lithane) successful based on the client statement: B. I'll call my doctor immediately if I experience any diarrhea or ringing in my ears.
This statement indicates that the client understands the potential side effects of the medication and knows to seek medical attention if they occur. It shows that the client has been properly educated about the medication's adverse effects.
Additionally, it is important to note that it is not recommended to double the dose if a dose is missed, as mentioned in option C. The client should follow the prescribed dosage instructions exactly as directed.