Citalopram vs Paroxetine: side-by-side comparison
Citalopram and Paroxetine belong to the same class (Selective serotonin reuptake inhibitor (SSRI)). They share therapeutic approach but differ in mechanism nuances, half-life, side-effect profile and available formulations. This comparison summarises what is common and where they diverge.
| Property | Citalopram | Paroxetine |
|---|---|---|
| Therapeutic class | Selective serotonin reuptake inhibitor (SSRI) | Selective serotonin reuptake inhibitor (SSRI) |
| CAS | 59729-33-8 | 61869-08-7 |
| ATC | N06AB04 | N06AB05 |
| Molecular weight | 324.39 g/mol | 329.37 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Both are in the Selective serotonin reuptake inhibitor (SSRI) class, giving them a common pharmacological architecture and many shared safety and management points. Choice within the class comes down to mechanism nuances, half-life, side-effect profile and individual response.
Key differences
Differences within the Selective serotonin reuptake inhibitor (SSRI) class are what matter in practice: half-life, route of administration, equivalent doses, specific interactions, predominant side-effect profile and accumulated clinical experience. This page frames them; the prescribing information gives quantitative detail.
Mechanisms compared
Citalopram: Citalopram selectively inhibits the serotonin reuptake transporter, increasing synaptic serotonin availability with limited affinity for noradrenaline transporters or other receptors. Paroxetine: Paroxetine selectively inhibits the serotonin reuptake transporter, increasing serotonin availability at the synapse.
Indications compared
Citalopram: Citalopram is approved for major depressive disorder. Paroxetine: Paroxetine is approved for major depressive disorder, generalised anxiety disorder, social anxiety disorder, panic disorder, obsessive-compulsive disorder and post-traumatic stress disorder, with regional variation.
Safety profile
Citalopram: Common adverse effects include nausea, dry mouth, headache, sexual dysfunction, sleep disturbance and increased sweating. Paroxetine: Common adverse effects include nausea, sexual dysfunction (more pronounced than with most SSRIs), weight gain, sleep disturbance, fatigue and anticholinergic symptoms.
Frequently asked questions
Is Citalopram better than Paroxetine? ▾
Neither is universally better. Citalopram and Paroxetine share the Selective serotonin reuptake inhibitor (SSRI) class but differ in half-life, mechanism nuances and side-effect profile. The choice depends on the patient and the prescriber.
Can Citalopram and Paroxetine be combined? ▾
Combining two ingredients from the same Selective serotonin reuptake inhibitor (SSRI) class is uncommon and, in most cases, adds no benefit over one at an appropriate dose. The decision is always the prescriber's.
Do they have the same side-effect profile? ▾
Partly yes — they share many Selective serotonin reuptake inhibitor (SSRI) class effects, with nuances by mechanism and dose. The prescribing information lists differences.
Products with Citalopram
Products with Paroxetine
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.