What is Sertraline?
Sertraline is a selective serotonin reuptake inhibitor (SSRI) antidepressant medication that works by blocking the reuptake of serotonin into presynaptic nerve terminals in the brain. 1
Mechanism of Action
Sertraline's therapeutic effect comes from its potent and selective inhibition of serotonin (5-HT) reuptake in the central nervous system. The drug has minimal effects on norepinephrine or dopamine reuptake and shows negligible binding to other receptor systems including adrenergic, cholinergic, histaminergic, or dopaminergic receptors 1. This selectivity distinguishes it from older antidepressants and contributes to its more favorable side effect profile.
Clinical Indications
Sertraline is FDA-approved and guideline-recommended as a first-line treatment for major depressive disorder (MDD), with the American College of Physicians recommending selection among second-generation antidepressants based on adverse effect profiles, cost, and patient preferences 2. Beyond depression, sertraline has demonstrated efficacy in:
- Obsessive-compulsive disorder
- Panic disorder
- Post-traumatic stress disorder
- Social phobia
- Premenstrual dysphoric disorder 3
The evidence shows mixed results for dysthymia treatment 2.
Pharmacokinetics
- Absorption: Slowly absorbed orally with peak plasma concentrations occurring 4.5-8.4 hours after dosing
- Half-life: Approximately 26 hours, allowing once-daily dosing
- Steady-state: Achieved after approximately one week of daily dosing
- Metabolism: Undergoes extensive first-pass metabolism via N-demethylation to form N-desmethylsertraline, a weakly active metabolite 1, 4
The drug exhibits linear dose-proportional pharmacokinetics across the 50-200 mg dose range 1.
Common Adverse Effects
The most frequently reported side effects include 2:
- Gastrointestinal: Nausea (most common reason for discontinuation), diarrhea (higher rate than other SSRIs), vomiting
- Central nervous system: Dizziness, headache, insomnia, somnolence
- Sexual dysfunction: Ejaculatory delay in males (though lower rates than paroxetine)
- Other: Constipation
Important safety consideration: As an SSRI, sertraline carries an increased risk for nonfatal suicide attempts compared to placebo (odds ratio 1.57-2.25), though no increased risk for completed suicide 2.
Drug Interactions
Sertraline has minimal inhibitory effects on major cytochrome P450 enzymes, resulting in fewer clinically significant drug-drug interactions compared to some other antidepressants 4. However, it is highly protein-bound and may alter blood levels of other highly protein-bound medications 3.
Dosing Considerations
The dose-response relationship shows that therapeutic response increases with dosage, while adverse effects slightly decrease between 50-150 mg but increase above 150 mg 5. Standard therapeutic dosing ranges from 50-200 mg daily 1.