Psychotherapeutic Drugs for Anxiety and Mania

Clinical Alert: Benzodiazepine Safety When administering benzodiazepines, always monitor for adverse effects such as confusion, ataxia (loss of coordination), headache, and slurred speech. Furthermore, be vigilant regarding drug interactions; alcohol and oral contraceptives can significantly impact the effects of these medications.

Miscellaneous Anxiolytics: Buspirone Hydrochloride

Unlike benzodiazepines, buspirone hydrochloride has an unknown mechanism of action. It is administered on a scheduled basis rather than "as needed". While it lacks the immediate sedative effects of benzodiazepines, it may cause side effects such as dizziness, headache, nausea, blurred vision, or even "paradoxical anxiety".

Mood Stabilizers: Lithium

Affective disorders, or mood disorders, involve changes in mood ranging from mania (abnormally pronounced emotions) to depression. For the treatment of mania, the drug of choice is Lithium.

Lithium is thought to work by potentiating serotonergic neurotransmission. However, lithium is a high-alert medication because it has a very narrow therapeutic range. This means the difference between a dose that treats the patient and a dose that is toxic is very small.

Managing the Therapeutic Range

To ensure patient safety, clinicians must monitor lithium serum levels closely. The levels are categorized as follows:

• Acute Mania: $1.0$ to $1.5 \text{ mmol/L}$.
• Maintenance: $0.6$ to $1.2 \text{ mmol/L}$.
• Toxicity: Levels exceeding $1.5$ to $2.0 \text{ mmol/L}$ begin to produce toxicity.
• Severe Toxicity: Levels exceeding $2.0 \text{ mmol/L}$ can lead to life-threatening reactions.

Nursing Tip: Sodium and Lithium Maintaining a normal sodium level (between $135$ and $145 \text{ mmol/L}$) is critical for patients on lithium therapy, as sodium levels directly influence the maintenance of therapeutic lithium levels.

Adverse Effects and Toxicity

Lithium carries a significant risk profile. The most serious adverse effect is cardiac dysrhythmia. Other common side effects include:

• Drowsiness and slurred speech.
• Ataxia and choreoathetotic movements (involuntary wavelike movements).
• Hypotension and seizures.
• Long-term use may lead to hypothyroidism.

If a patient presents with gastrointestinal discomfort, tremors, confusion, or somnolence, clinicians must immediately assess for lithium toxicity.

Summary of Drug Interactions

Understanding how these drugs interact with other substances is vital for preventing adverse events.