Drug-Induced Psychiatric Symptoms

DIPS: Introduction - Mind-Altering Meds

• Drug-Induced Psychiatric Symptoms (DIPS): Psychiatric manifestations (e.g., mood, psychosis, anxiety, cognitive changes) directly caused by medication, substance use, or withdrawal.
• Critical in differential diagnosis: helps distinguish DIPS from primary psychiatric illnesses, ensuring appropriate management.
• Common Neurotransmitter Systems Implicated (📌 Sad Doctors Need A Good laugh):
  • Serotonin (5-HT)
  • Dopamine (DA)
  • Norepinephrine (NE)
  • Acetylcholine (ACh)
  • GABA ($\gamma$-Aminobutyric acid)

⭐ Elderly patients are particularly vulnerable to DIPS due to polypharmacy and altered pharmacokinetics.

DIPS: Culprit Drugs - Pharma's Dark Side

Drug-Induced Psychiatric Symptoms (DIPS) can mimic primary disorders. Always review medications.

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High-dose corticosteroids are notorious for inducing psychosis or mania (steroid-induced psychosis).

📌 Mnemonic: Remember "Can Cause Many Psychiatric Symptoms" for key culprits like Corticosteroids, CNS stimulants, Anticholinergics.

DIPS: Key Syndromes - When Meds Go Rogue

• Drug-induced Psychosis
  • Key Features: Hallucinations, delusions, disorganized thought/speech.
  • Common Triggers: Stimulants (e.g., amphetamines), corticosteroids, L-DOPA, cannabis.
• Drug-induced Depression
  • Key Features: Persistent low mood, anhedonia, fatigue, sleep changes.
  • Common Triggers: Beta-blockers (e.g., propranolol), interferons, isotretinoin, varenicline.
• Drug-induced Mania/Hypomania
  • Key Features: Elevated/irritable mood, increased energy, racing thoughts, decreased sleep.
  • Common Triggers: Antidepressants (in bipolar disorder), corticosteroids, L-DOPA.
• Drug-induced Anxiety
  • Key Features: Excessive worry, restlessness, panic attacks, palpitations.
  • Common Triggers: Stimulants (e.g., caffeine, methylphenidate), theophylline, BZD withdrawal.
• Drug-induced Delirium
  • Key Features: Acute onset confusion, fluctuating consciousness, inattention, perceptual disturbances.
  • Common Triggers: Anticholinergics (e.g., TCAs), opioids, sedative-hypnotics (benzodiazepines), polypharmacy.

⭐ Anticholinergic drugs are a leading cause of drug-induced delirium, especially in the elderly.

DIPS: Clinical Steps - Spot & Stop

Diagnostic Approach:

• Temporal Association: Symptom onset linked to drug initiation or dose change.
• Dechallenge: Symptoms improve after stopping or reducing the suspected drug.
• Rechallenge: (Ethical concerns; rarely performed) Symptoms reappear if drug is reintroduced.
• Exclusion: Rule out other potential medical or psychiatric causes.
• Mention: Naranjo Algorithm for causality.

Management Strategy:

• Primary Action: Discontinue or reduce the dose of the offending drug if clinically possible.
• Symptomatic Treatment (Short-term):
  • Psychosis: Antipsychotics.
  • Anxiety: Anxiolytics.
• Supportive Care: Non-pharmacological interventions and support.

⭐ The first and most crucial step in managing DIPS is identification and withdrawal of the suspected offending agent.

High‑Yield Points - ⚡ Biggest Takeaways

• Corticosteroids are well-known for inducing psychosis, mania, or depression.
• Levodopa frequently causes visual hallucinations and psychosis in Parkinson's patients.
• Beta-blockers (e.g., propranolol) can precipitate depression, fatigue, and vivid nightmares.
• Interferon therapy carries a high risk of severe depression and suicidal ideation.
• Anticholinergics often trigger acute delirium and confusion, particularly in the elderly.
• Isoniazid can induce psychosis, especially with underlying vitamin B6 deficiency.