Dapoxetin

# Dapoxetin ## Overview - **Classification**: Selective Serotonin Reuptake Inhibitor (SSRI) - **Mechanism**: Inhibits serotonin reuptake, increasing serotonin levels in the synaptic cleft, which is thought to prolong ejaculatory latency. ## Primary Indications 1. **Premature Ejaculation (PE)** - On-demand treatment for adult men with persistent or recurrent PE. ## Adult Dosing ### Standard Dosing **Premature Ejaculation** - **Dose**: Start with **30 mg** - **Frequency**: As needed, **1 to 3 hours prior to anticipated sexual activity** - **Route**: Oral - **Maximum Dose**: If 30 mg is insufficient and well-tolerated, may increase to **60 mg**. Do not exceed **60 mg** in any 24-hour period. - **Special Considerations**: Not intended for continuous daily use. Take with at least one full glass of water. ### Dose Adjustments - **Renal Impairment**: No dose adjustment needed for mild to moderate impairment. Not recommended for severe renal impairment. - **Hepatic Impairment**: - **Mild (Child-Pugh A)**: No adjustment. - **Moderate (Child-Pugh B)**: Exercise caution, consider lower starting dose. - **Severe (Child-Pugh C)**: **Contraindicated**. - **Elderly Patients**: No specific dose adjustment but use with caution due to potential increased risk of syncope. ## Pediatric Dosing Dapoxetine is **not approved** for use in pediatric populations (under 18 years of age). Its safety and efficacy have not been established. ### Neonates (0-28 days) - **Dose**: Not applicable. Use is **contraindicated**. ### Infants (1-12 months) - **Dose**: Not applicable. Use is **contraindicated**. ### Children (1-12 years) - **Dose**: Not applicable. Use is **contraindicated**. ### Adolescents (13-18 years) - **Dose**: Not applicable. Use is **contraindicated**. ## Safety Information ### Contraindications - **Absolute**: Known hypersensitivity to dapoxetine or excipients. - **Absolute**: Significant pathological cardiac conditions (e.g., heart failure, conduction abnormalities, ischemic heart disease). - **Absolute**: History of syncope or significant orthostatic hypotension. - **Absolute**: Severe hepatic impairment (Child-Pugh Class C). - **Absolute**: Concomitant use with Monoamine Oxidase Inhibitors (MAOIs) or within 14 days of discontinuing an MAOI. - **Absolute**: Concomitant use with other serotonergic drugs (SSRIs, SNRIs, TCAs, tramadol, linezolid, St. John's wort) or within 14 days of discontinuing these drugs. - **Absolute**: Concomitant use with potent CYP3A4 inhibitors (e.g., ketoconazole, ritonavir, atazanavir, telithromycin, nefazodone, nelfinavir, saquinavir). ### Common Adverse Effects - **Very Common (>10%)**: Nausea, Dizziness, Headache. - **Common (1-10%)**: Diarrhea, Insomnia, Anxiety, Agitation, Somnolence, Fatigue, Blurred vision, Tremor, Dry mouth, Vomiting, Erectile dysfunction. - **Serious but Rare**: Syncope, Orthostatic hypotension, Seizures, Serotonin Syndrome (with other serotonergic agents), Mood changes/suicidal ideation (class effect for SSRIs, less direct for PE indication). ### Key Drug Interactions - **MAOIs/SSRIs/SNRIs**: Risk of **Serotonin Syndrome**. Avoid concomitant use; allow washout periods. - **Potent CYP3A4 Inhibitors**: Significantly increases dapoxetine levels, increasing risk of adverse effects. **Contraindicated**. - **Moderate CYP3A4 Inhibitors (e.g., erythromycin, verapamil, fluconazole)**: Increased dapoxetine levels. Max dapoxetine dose **30 mg**. - **PDE5 Inhibitors (e.g., sildenafil, tadalafil)**: Increased risk of orthostatic hypotension. Use with caution. - **Alpha-blockers**: Increased risk of orthostatic hypotension. Use with caution. - **Alcohol**: Exacerbates neurocognitive effects and risk of syncope. **Avoid** concomitant use. ## Monitoring & Follow-up - **Before Treatment**: - Thorough medical history (cardiac, syncope, psychiatric conditions). - Orthostatic vital signs (blood pressure, heart rate) to assess for orthostatic hypotension. - **During Treatment**: - Monitor for signs of orthostatic hypotension or syncope, especially after initial doses or dose escalation. - Assess for psychiatric changes (anxiety, agitation, mood changes). - Monitor for signs of Serotonin Syndrome if other serotonergic drugs are used. - **Clinical Signs**: Educate patient to recognize prodromal symptoms of syncope (lightheadedness, nausea, sweating, palpitations) and to lie down immediately. ## Clinical Pearls - 💡 **On-Demand Dosing**: Dapoxetine is taken only when needed, 1-3 hours before sexual activity, not as a daily medication. - 💡 **Hydration**: Always take with at least one full glass of water to reduce the risk of syncope. - 💡 **Avoid Alcohol**: Combining dapoxetine with alcohol increases the risk of syncope and other adverse effects. - 💡 **Not FDA-Approved**: Dapoxetine is approved in many countries but **not in the United States**. - 💡 **First Dose Observation**: Consider taking the first dose under medical supervision, especially if syncope risk factors are present. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.