## First-Line Pharmacotherapy for OCD **Key Point:** SSRIs are the first-line pharmacological treatment for OCD. Sertraline, fluoxetine, paroxetine, and fluvoxamine are all FDA-approved and evidence-based options. ### Why SSRIs? SSRIs work by increasing serotonergic neurotransmission in the orbitofrontal-anterior cingulate circuits implicated in OCD pathophysiology. They are preferred over other agents because of: - **Efficacy:** 40–60% response rate with 8–12 weeks of treatment - **Safety profile:** Minimal anticholinergic and cardiovascular effects - **Tolerability:** Lower risk of weight gain and sexual dysfunction compared to tricyclics - **Dosing:** Higher doses are often required (e.g., sertraline 50–200 mg/day; fluoxetine 40–80 mg/day) **High-Yield:** OCD typically requires **higher SSRI doses and longer duration** (12 weeks minimum) compared to depression or anxiety disorders. ### Comparison of First-Line Agents | Agent | Typical OCD Dose | Onset | Notes | |-------|------------------|-------|-------| | Sertraline | 50–200 mg/day | 8–12 weeks | Good tolerability, first choice | | Fluoxetine | 40–80 mg/day | 8–12 weeks | Longer half-life, fewer withdrawals | | Paroxetine | 40–60 mg/day | 8–12 weeks | Higher discontinuation syndrome | | Fluvoxamine | 100–300 mg/day | 8–12 weeks | Potent CYP1A2 inhibitor | **Clinical Pearl:** If inadequate response after 10–12 weeks at therapeutic dose, consider augmentation with low-dose antipsychotics (risperidone, aripiprazole) rather than switching agents. ### Non-Pharmacological Adjuncts - **Cognitive-behavioral therapy (CBT)** with exposure and response prevention (ERP) is equally or more effective than medication alone - Combined pharmacotherapy + CBT yields superior outcomes - Duration of treatment: typically 1–2 years minimum **Mnemonic:** **SSRI-OCD** = SSRIs are the Selective Serotonin Reuptake Inhibitors of choice for Obsessive-Compulsive Disorder.
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