Lesson
Diagnose the Episode, Not One Symptom
MDD is a syndromic and functional diagnosis. It requires a complete episode history, exclusions, and a search for bipolar, medical, substance, medication, and contextual explanations.
- DSM-5-TR
- Anhedonia
- Impairment
- Bipolar screen
- Differential
diagnosis differential
Connect diagnosis, safety, treatment fit, and measured recovery.
Build the episode
Confirm at least five symptoms in the same two-week period, including depressed mood or diminished interest or pleasure. Establish change from baseline, distress or impairment, and the absence of a better explanation.
Test the differential
Ask about past mania or hypomania, psychosis, anxiety, trauma, grief, sleep, substances, medications, pain, pregnancy, thyroid disease, neurologic disease, and other relevant medical conditions.
Describe severity precisely
Symptoms, function, psychosis, catatonia, nutrition, self-care, suicide risk, recurrence, and chronicity matter more than a single adjective or score.
Avoid chemical-imbalance shorthand
Monoamine, glutamate, stress, inflammatory, circadian, network, genetic, and environmental models inform treatment, but no routine test proves a simple neurotransmitter deficiency.
Quick check
Lesson
Make Safety a Clinical Pathway
Suicide screening is an opening, not a disposition. Current thoughts, intent, plan, access, behavior, intoxication, agitation, supports, and ability to collaborate determine the next action.
- Ideation
- Intent
- Plan
- Means
- Protective factors
suicide safety
Connect diagnosis, safety, treatment fit, and measured recovery.
Ask directly
Use clear language about passive death wishes, active thoughts, intent, plan, preparation, past attempts, interrupted attempts, self-injury, and access to lethal means.
Recognize immediacy
A specific plan, intent, available means, severe agitation, intoxication, psychosis, recent attempt, or inability to maintain safety can require emergency intervention and continuous supervision.
Build a collaborative safety plan
Identify warning signs, internal coping, people and places for distraction, support contacts, professional resources, lethal-means reduction, and the next scheduled contact.
Escalate treatment without false reassurance
Antidepressants do not provide immediate protection. Urgent psychotherapy, crisis care, hospitalization, ECT, or other rapid interventions may be necessary.
Quick check
Lesson
Measure What Recovery Changes
A validated symptom scale becomes useful only when paired with function, safety, adherence, adverse effects, goals, and a planned response to the result.
- PHQ-9
- Function
- Psychotherapy
- Shared choice
- Follow-up
measurement psychotherapy
Connect diagnosis, safety, treatment fit, and measured recovery.
Create a baseline
Record symptoms, function, sleep, appetite, cognition, pain, substance use, adherence barriers, adverse-effect priorities, and patient-defined recovery goals.
Select psychotherapy
CBT, behavioral activation, interpersonal therapy, problem-solving therapy, and other evidence-based approaches can be first-line or combined with medication.
Match intensity to need
Mild illness may begin with psychotherapy or medication. More severe, recurrent, psychotic, catatonic, or dangerous illness needs more intensive and often combined care.
Close the loop
Set the next review date, target change, adherence check, safety check, and explicit action if the target is not met.
Quick check
Lesson
Use SSRI Differences Deliberately
SSRIs share serotonin-transporter inhibition, but half-life, interactions, QT effect, activation, sedation, withdrawal, dosage forms, and patient experience differ.
- SERT
- Sexual effects
- Hyponatremia
- Bleeding
- QT
ssri selection
Connect diagnosis, safety, treatment fit, and measured recovery.
Explain the mechanism and timeline
SERT inhibition increases synaptic serotonin quickly, while clinical response emerges through downstream adaptation over weeks. Early adverse effects can precede benefit.
Anticipate class effects
Discuss nausea, diarrhea, headache, sleep change, activation, sweating, sexual dysfunction, bruising or bleeding, hyponatremia, and discontinuation symptoms.
Use individual differences
Fluoxetine has a long half-life and important CYP2D6 inhibition. Paroxetine has anticholinergic, weight, sexual, withdrawal, and pregnancy-selection concerns. Citalopram requires QT-aware dosing.
Monitor the transition
Review adherence, activation, suicidality, serotonin toxicity, sodium risk, bleeding exposures, and early symptom trajectory after initiation or dose change.
Quick check
Lesson
Add Norepinephrine With a Monitoring Plan
SNRIs can be useful when depression coexists with selected pain syndromes, but blood pressure, pulse, activation, nausea, and withdrawal shape fit.
- SERT
- NET
- Pain
- Blood pressure
- Withdrawal
snri selection
Connect diagnosis, safety, treatment fit, and measured recovery.
Connect dose and pharmacology
Serotonin effects often dominate at lower doses for some agents, with more norepinephrine contribution as exposure rises. This pattern is not identical across the class.
Use pain indications precisely
Duloxetine can serve selected neuropathic pain, fibromyalgia, and musculoskeletal indications. Venlafaxine and desvenlafaxine should not inherit every duloxetine indication.
Respect organ function
Renal and hepatic function can change dosing or suitability. Duloxetine deserves special caution with substantial liver disease or heavy alcohol exposure.
Plan discontinuation
Shorter half-life agents can cause rapid withdrawal. Use a patient-specific taper and distinguish withdrawal from relapse.
Quick check
Lesson
Select by the Patient's Burden
Bupropion, mirtazapine, vortioxetine, vilazodone, and trazodone offer different tradeoffs in sleep, appetite, weight, sexual function, activation, interactions, and dosage instructions.
- Bupropion
- Mirtazapine
- Vortioxetine
- Vilazodone
- Trazodone
other antidepressants
Connect diagnosis, safety, treatment fit, and measured recovery.
Use bupropion safely
Its norepinephrine and dopamine reuptake effects can support energy and reduce sexual burden, but seizure disorders, eating disorders, and abrupt sedative or alcohol withdrawal are major contraindication contexts.
Use mirtazapine intentionally
Sedation, appetite stimulation, and weight gain may help or harm depending on insomnia, frailty, nausea, appetite, obesity, and patient goals.
Respect administration details
Vilazodone is taken with food. Vortioxetine has CYP2D6 considerations. Every agent still needs serotonergic and interaction review.
Treat trazodone as a real drug
Sedation, orthostasis, falls, and priapism require counseling. Low-dose insomnia use is not equivalent to a full antidepressant trial.
Quick check
Lesson
Reserve High-Burden Tools for the Right Case
TCAs and MAOIs can be effective but require more expertise because receptor promiscuity, overdose toxicity, conduction effects, interactions, and dietary restrictions narrow their margin.
- Anticholinergic
- Sodium channels
- Tyramine
- Washout
- Overdose
tca maoi
Connect diagnosis, safety, treatment fit, and measured recovery.
Map TCA effects
Monoamine reuptake inhibition accompanies muscarinic, histamine, alpha-1, and cardiac sodium-channel effects. Dry mouth, constipation, urinary retention, sedation, orthostasis, and conduction toxicity follow from that map.
Protect against overdose harm
Assess suicide risk, cardiac disease, falls, cognition, glaucoma, urinary retention, and anticholinergic burden before prescribing. Limit quantities when appropriate.
Control MAOI interactions
Irreversible nonselective MAO inhibition creates risk with serotonergic drugs, sympathomimetics, and high-tyramine foods. Patients need a written interaction plan.
Calculate washout
Most serotonergic drugs require adequate washout before an MAOI. Fluoxetine requires a longer interval because fluoxetine and norfluoxetine persist.
Quick check
Lesson
Separate Toxicity, Withdrawal, and Relapse
Serotonin toxicity and antidepressant discontinuation are mechanistically different emergencies and syndromes, while relapse follows a different timing and symptom pattern.
- Clonus
- Hyperreflexia
- FINISH
- Timing
- Taper
toxicity discontinuation
Connect diagnosis, safety, treatment fit, and measured recovery.
Recognize serotonin toxicity
Recent serotonergic exposure plus clonus, hyperreflexia, tremor, agitation, diaphoresis, diarrhea, autonomic instability, or hyperthermia should trigger urgent evaluation.
Treat severe toxicity
Stop serotonergic agents, provide supportive care, use benzodiazepines for agitation when appropriate, and aggressively manage severe hyperthermia and complications.
Recognize discontinuation
Flu-like symptoms, insomnia, nausea, imbalance, sensory symptoms, and hyperarousal can begin soon after reduction of a shorter half-life agent.
Design the taper
Reduce gradually, slow further if symptoms emerge, and individualize to dose, duration, half-life, prior withdrawal, relapse risk, and patient preference.
Quick check
Lesson
Treat the Illness and the Reproductive Context
Perinatal decisions compare the harms of untreated or relapsing illness with treatment evidence, pregnancy timing, lactation, maternal function, infant care, and patient values.
- Pregnancy
- Lactation
- Relapse
- Zuranolone
- Support
perinatal postpartum
Connect diagnosis, safety, treatment fit, and measured recovery.
Do not stop automatically
A patient with severe, recurrent, psychotic, or suicidal depression may face substantial relapse risk from abrupt discontinuation. Review prior course and alternatives before changing an effective regimen.
Plan medication and psychotherapy together
Use the best-supported effective option at the lowest complexity that maintains wellness, while considering reproductive safety evidence, neonatal adaptation, and lactation.
Recognize postpartum urgency
Assess suicidality, psychosis, mania, ability to sleep, infant safety, supports, and medical causes. Postpartum psychosis is an emergency and is not simply severe MDD.
Use neuroactive steroids accurately
Oral zuranolone is a 14-day course for adults with postpartum depression and carries prominent sedation and driving-impairment counseling. Brexanolone requires a supervised continuous infusion under its program and label.
Quick check
Lesson
Prove the Trial Before Calling It Resistant
Apparent treatment resistance may reflect the wrong diagnosis, inadequate dose or duration, nonadherence, intolerance, substance use, medical illness, unresolved trauma, or inaccessible psychotherapy.
- Adequacy
- Adherence
- Pseudo-resistance
- Switch
- Augment
inadequate response
Connect diagnosis, safety, treatment fit, and measured recovery.
Audit the diagnosis
Reassess bipolarity, psychosis, substance use, ADHD, trauma, personality, grief, sleep apnea, pain, thyroid disease, anemia, and medication contributors as indicated.
Audit the trial
Document drug, formulation, dose, duration, adherence, exposure-changing interactions, response, adverse effects, reason stopped, and whether psychotherapy was available.
Choose switch or augmentation
Switch when tolerability is poor or response is minimal. Consider augmentation when a well-tolerated treatment produced meaningful partial response.
Set a stop rule
Every adjunct needs a target, baseline, follow-up interval, safety monitoring, and a plan to stop if benefit does not justify burden.
Quick check
Lesson
Escalate With Precision
Augmentation, esketamine, TMS, and ECT are distinct interventions with different indications, speed, logistics, monitoring, and evidence.
- Lithium
- Atypical antipsychotic
- Esketamine
- TMS
- ECT
advanced treatment
Connect diagnosis, safety, treatment fit, and measured recovery.
Use augmentation intentionally
Selected antipsychotics have adjunctive MDD indications, including aripiprazole, brexpiprazole, quetiapine XR, cariprazine, and, under current 2025 labeling, lumateperone. Verify current label, dose, interactions, metabolic and movement risks.
Use esketamine under the REMS
SPRAVATO is administered under supervision with post-dose monitoring. Current labeling permits monotherapy or combination with an oral antidepressant for adult TRD, while acute suicidal ideation or behavior treatment is paired with an oral antidepressant.
Place TMS appropriately
TMS is noninvasive and avoids systemic drug exposure but requires repeated visits and device-specific protocols. It is not a substitute for emergency containment of imminent risk.
Use ECT when speed and efficacy matter
Severe psychotic depression, catatonia, profound nutritional compromise, urgent suicidality, pregnancy in selected cases, and prior strong response can justify early ECT consultation.
Quick check
Lesson
Turn Response Into Durable Recovery
Initial symptom improvement is not the endpoint. Remission, function, safety, relationships, cognition, sleep, work, adherence, and the patient's own goals define recovery.
- Response
- Remission
- Continuation
- Maintenance
- Relapse prevention
recovery plan
Connect diagnosis, safety, treatment fit, and measured recovery.
Differentiate phases
Acute treatment seeks response and remission. Continuation consolidates remission. Maintenance prevents recurrence in patients with greater long-term risk.
Individualize duration
Recurrent episodes, chronic depression, severe episodes, psychosis, suicidality, residual symptoms, comorbidity, and prior relapse after stopping support longer maintenance.
Preserve what worked
Document effective dose, psychotherapy skills, sleep and activity routines, social supports, adverse effects, barriers, and the earliest personal warning signs.
Coordinate ownership
Name who monitors symptoms, safety, medications, metabolic or organ-specific risks, psychotherapy, reproductive needs, and the next escalation decision.
Quick check
Module test
Check the connections.
Each attempt draws 10 questions from the complete 100 question bank.
Each attempt draws a fresh set and rearranges the answer choices.
References
Current clinical foundation.
Lecture material was synthesized with the following contemporary guidance. Verify local policy and current guidance before applying clinical information.