Educational Disclaimer: This case study is for educational and informational purposes only. It does not constitute medical advice, clinical guidance, or a substitute for professional psychiatric evaluation. All diagnostic criteria referenced are from the DSM-5-TR (APA, 2022). Clinicians should rely on their professional training, direct patient assessment, and current evidence-based guidelines when making diagnostic and treatment decisions.

Clinical Vignette

Patient: "Mr. D," 31-year-old sales representative, brought to the emergency department after his coworker found him in the office at 3 AM rearranging furniture and claiming he was 'redesigning the entire sales floor for maximum energy flow.'

Chief Concern: "Everything makes so much sense right now. I can see the patterns in everything. I just need one more night to finish my plan."

History of Present Illness: Mr. D has been using cocaine recreationally for 2 years, escalating over the past 3 months to daily use. His coworker reports that Mr. D's behavior changed dramatically over the past 5 days: pressured speech, grandiose claims about 'revolutionary' sales strategies, minimal sleep (perhaps 4 hours in 5 days), and spending $8,000 on 'business investments' from his personal savings. He was found by security at 3 AM in the office, furniture rearranged, whiteboards covered in diagrams. Urine toxicology is positive for cocaine and benzoylecgonine. His last cocaine use was approximately 14 hours ago. He has no prior psychiatric history and no family history of bipolar disorder. His mother confirms he was a 'quiet, steady kid' with no mood or behavioral issues prior to cocaine use. There have been no similar episodes prior to his cocaine use starting 2 years ago.

Substance Use: Cocaine: daily use for 3 months, escalating from recreational weekend use over 2 years. Alcohol: social use. No other substances.

Mental Status Exam: Hyperactive, restless. Speech markedly pressured. Mood 'incredible.' Affect euphoric, labile. Thought process tangential with flight of ideas. Grandiose ideation (business 'revolution'). No hallucinations. Dilated pupils. Tachycardia (HR 112). Insight absent.

Step 1: Applying DSM-5-TR Temporal Attribution

DSM-5-TR requires establishing whether the manic presentation is a direct physiological consequence of a substance or represents a primary bipolar disorder. The temporal relationship is the primary determinant.

Criterion A: A prominent and persistent disturbance in mood (elevated, expansive, or irritable) with increased energy or activity that predominates in the clinical picture.

Five-day period of euphoria, markedly increased energy, pressured speech, grandiosity, minimal sleep. Mood disturbance is the predominant clinical feature. MET.

Criterion B: Evidence from history, physical exam, or laboratory findings that symptoms developed during or soon after substance intoxication or withdrawal, AND the substance is capable of producing the symptoms.

Urine positive for cocaine. Daily cocaine use for 3 months. Cocaine is a known cause of manic-like states (dopaminergic stimulation). Symptoms developed in the context of escalating cocaine use. MET.

Criterion C: Not better explained by a bipolar disorder that is not substance-induced.

No prior manic or hypomanic episodes before cocaine use began. No family history of bipolar disorder. No childhood/adolescent mood instability. Mother confirms normal premorbid personality. All manic symptoms have occurred exclusively during the period of cocaine use. MET — evidence supports substance-induced etiology.

Step 2: Distinguishing from Primary Bipolar I

Feature Substance-Induced Mania Primary Bipolar I This Patient
Temporal relationship to substance Symptoms coincide with use/withdrawal Independent of substance use Substance-induced: all episodes during cocaine use period
Prior mood episodes None before substance use Episodes independent of substance None before cocaine use at age 29
Family history Variable Often positive for mood disorders Negative for bipolar
Resolution with sobriety Resolves within days-weeks of cessation Recurs independently Pending observation
Premorbid personality Stable May show cyclothymic traits Stable ('quiet, steady kid')
Physical signs Tachycardia, dilated pupils, other substance effects Usually absent Present: tachycardia, dilated pupils

Attribution Summary

The absence of any mood episodes before cocaine use, negative family history, stable premorbid personality, positive toxicology, and physical signs of stimulant use all support substance-induced etiology. The definitive test is clinical observation after sustained sobriety: if manic symptoms resolve completely and do not recur, the substance-induced diagnosis is confirmed.

Diagnostic Formulation

Diagnostic Conclusion

Substance/Medication-Induced Bipolar and Related Disorder, Cocaine, with Manic Features (F14.24): DSM-5-TR criteria for substance-induced bipolar met. Manic symptoms developed in temporal context of escalating cocaine use. No prior mood episodes independent of substance. Negative bipolar family history. Provisional diagnosis pending clinical course after sustained abstinence. If manic symptoms recur during verified sobriety, diagnosis would be revised to Bipolar I Disorder with comorbid Cocaine Use Disorder.

Teaching Points

  • The DSM-5-TR temporal attribution model requires the clinician to determine whether mood symptoms: (1) developed during or soon after substance use, (2) are caused by a substance capable of producing those symptoms, and (3) are not better explained by an independent mood disorder.
  • Cocaine-induced mania can be clinically indistinguishable from primary Bipolar I mania at a single cross-sectional assessment. The differential requires longitudinal information: premorbid history, family history, and clinical course during sustained sobriety.
  • The 'challenge' of stimulant-induced mania: cocaine produces its manic-like effects through dopamine reuptake inhibition, the same neurotransmitter system implicated in primary mania. This pharmacological overlap is why the clinical presentations are so similar.
  • Sustained sobriety observation is both diagnostic and therapeutic. If manic symptoms persist beyond the expected drug clearance window (cocaine: 72 hours for acute effects; chronic use may produce persistent effects for weeks), the probability of an independent bipolar disorder increases.
  • Dual diagnosis (Bipolar I + Stimulant Use Disorder) is common outside of the substance-induced designation. Some individuals with primary Bipolar Disorder use stimulants to prolong or intensify manic states. In such cases, both diagnoses are assigned independently.