Final answer:
Lithium and valproic acid are appropriate agents for a 23-year-old client in the manic phase of bipolar disorder to help stabilize mood swings.
Step-by-step explanation:
For a 23-year-old client in the manic phase of bipolar disorder, appropriate agents would be lithium (Lithobid) and valproic acid (Depakote). These medications are commonly used as mood stabilizers to help manage the symptoms of bipolar disorder. Lithium works by regulating neurotransmitters in the brain, while valproic acid helps to stabilize mood swings. It is important for the client to work closely with their healthcare provider to determine the appropriate dosage and to monitor any potential side effects.