Vortioxetine (Trintellix)

Vortioxetine, best known by the brand name Trintellix, is an antidepressant used in Canada for the treatment of major depressive disorder in adults. Unlike a conventional SSRI that primarily inhibits the serotonin transporter, vortioxetine combines serotonin reuptake inhibition with direct activity at several serotonin receptors.

Its principal pharmacological actions include:

• SERT — Serotonin Transporter inhibition
• 5-HT1A receptor agonism
• 5-HT1B receptor partial agonism
• 5-HT3 receptor antagonism
• 5-HT7 receptor antagonism
• 5-HT1D receptor antagonism This broader receptor profile is why vortioxetine is sometimes described as a multimodal serotonergic antidepressant rather than simply an SSRI. The precise contribution of each serotonin receptor action to its antidepressant effect has not been established.

A simplified pathway is:

1. Vortioxetine
2. Blocks SERT

• Serotonin reuptake decreases
• Directly modulates several serotonin receptors

1. Serotonin signaling changes across multiple neural pathways
2. Mood and emotional-regulation networks gradually adapt
3. Depressive symptoms may improve

What Is Vortioxetine Used For?

In Canada, vortioxetine is approved for: Major Depressive Disorder in Adults

Major depressive disorder can involve:

• Persistent low mood
• Loss of interest or pleasure
• Low motivation
• Reduced energy
• Poor concentration
• Sleep disturbance
• Appetite changes
• Repetitive negative thinking
• Feelings of hopelessness or guilt
• Difficulty functioning at work or home Health Canada continues to list Trintellix as marketed, with a current product monograph dated July 10, 2026. Trintellix is available as 5 mg, 10 mg, 15 mg and 20 mg tablets. Generic APO-Vortioxetine is also marketed in Canada in the same strengths.

Is Vortioxetine Used for Anxiety?

Vortioxetine may improve anxiety symptoms that occur as part of depression, and its serotonin-receptor pharmacology has obvious relevance to anxiety pathways.

However:

Vortioxetine is not approved in Canada as a general treatment for anxiety disorders.

Its Canadian indication is: Major Depressive Disorder in adults.

Is Vortioxetine Approved for Children?

No.

Vortioxetine is:

Not indicated in Canada for patients under 18 years of age.

Antidepressant treatment also requires monitoring for new or worsening behavioural changes, agitation, impulsivity or suicidal thinking, particularly early in treatment or following dose changes.

How Does Vortioxetine Work?

Vortioxetine has a more complex serotonergic mechanism than a conventional SSRI.

Its primary transporter action is:

SERT Inhibition- SERT normally transports serotonin back into the presynaptic neuron after release.

Therefore:

1. Vortioxetine
2. SERT inhibited
3. Serotonin reuptake decreases
4. More serotonin remains available between neurons

But vortioxetine also directly interacts with several serotonin receptors.

Its established pharmacology includes:

Target	Vortioxetine action
SERT	Inhibition
5-HT1A	Agonism
5-HT1B	Partial agonism
5-HT3	Antagonism
5-HT7	Antagonism
5-HT1D	Antagonism

Vortioxetine has high affinity for SERT and minimal meaningful affinity for norepinephrine or dopamine transporters.

Is Vortioxetine an SSRI?

Vortioxetine does inhibit serotonin reuptake, so it shares an important mechanism with SSRIs.

However, describing it simply as an SSRI misses much of its pharmacology.

Conventional SSRI

1. SERT inhibition
2. Serotonin signaling increases

Vortioxetine

• SERT inhibition
• 5-HT1A agonism
• 5-HT1B partial agonism
• 5-HT3, 5-HT7 and 5-HT1D antagonism Broader serotonergic modulation A useful description is therefore: Multimodal Serotonergic Antidepressant or: Serotonin Modulator

Does Vortioxetine Increase Serotonin?

Yes, indirectly.

Vortioxetine does not primarily make neurons produce more serotonin.

Instead:

1. Serotonin is released
2. SERT normally removes serotonin
3. Vortioxetine blocks SERT
4. Serotonin remains available longer
5. Serotonin receptor signaling increases or changes

At the same time, vortioxetine directly modifies several serotonin receptors, which makes its overall serotonergic effect more complex than increasing serotonin concentration alone.

Does Vortioxetine Improve Cognition?

Vortioxetine has received considerable attention for possible effects on cognitive symptoms associated with depression, including:

• Concentration
• Processing speed
• Executive function
• Memory Several clinical studies have examined these outcomes.

However, Canadian evidence reviews found the results to be heterogeneous, and CADTH concluded that the available evidence did not allow firm conclusions about vortioxetine’s comparative effect on cognitive function.

For a patient-facing website, the most defensible statement is:

Vortioxetine has been studied for cognitive symptoms associated with depression, but it should not be presented as a proven cognitive-enhancing medication or as clearly superior to other antidepressants for cognition.

Does Vortioxetine Increase Dopamine?

Not significantly through direct dopamine-transporter inhibition.

Vortioxetine has very little affinity for: DAT — Dopamine Transporter compared with SERT.

However, serotonin receptors can indirectly influence dopamine pathways.

For example, modulation of:

• 5-HT1A
• 5-HT3
• 5-HT7 can alter downstream dopamine signaling in some cortical circuits.

Therefore, vortioxetine may produce indirect regional effects on dopamine, but it should not be described as a dopamine-reuptake inhibitor or a primarily dopaminergic antidepressant.

Does Vortioxetine Increase Norepinephrine?

Not significantly through direct NET inhibition.

Vortioxetine’s affinity for: NET — Norepinephrine Transporter is much lower than its affinity for SERT.

It is therefore: Not an SNRI

like:

• Venlafaxine
• Desvenlafaxine
• Duloxetine
• Levomilnacipran Indirect changes in norepinephrine signaling can occur through serotonin-receptor interactions, but vortioxetine remains primarily:

Serotonergic

How Long Does Vortioxetine Take to Work?

SERT and serotonin receptors are affected relatively quickly after the medication reaches therapeutic concentrations.

Clinical antidepressant improvement takes longer because neural systems must adapt.

The process is:

1. Vortioxetine reaches the brain
2. SERT inhibited + serotonin receptors modulated
3. Serotonin signaling changes
4. Feedback systems and receptors adapt
5. Intracellular signaling and neural networks change
6. Depressive symptoms gradually improve

Some symptoms may begin to improve within the first several weeks, while a fuller antidepressant response generally requires continued treatment.

What Are the Common Side Effects of Vortioxetine?

The most characteristic adverse effect is:

Nausea

Other common or clinically important effects include:

• Nausea
• Diarrhea
• Dry mouth
• Constipation
• Vomiting
• Dizziness
• Abnormal dreams
• Headache
• Sexual dysfunction
• Sweating
• Sleep-related changes Canadian pooled short-term trials showed that nausea was dose-related. Reported rates were approximately 20.5% at 5 mg, 22.6% at 10 mg, 31.2% at 15 mg and 27.2% at 20 mg, compared with 8.1% with placebo.

These trial percentages describe populations and do not predict what an individual patient will experience.

Why Does Vortioxetine Cause Nausea?

Serotonin has major functions in the: Gastrointestinal System

When SERT is inhibited:

1. Vortioxetine
2. Serotonin reuptake decreases in the gut
3. Serotonergic signaling increases
4. GI sensory and motility pathways are stimulated
5. Nausea

Nausea is generally most prominent early in treatment and often becomes less troublesome with continued treatment.

Does Vortioxetine Cause Sexual Dysfunction?

It can.

Possible sexual effects include:

• Reduced libido
• Delayed orgasm
• Difficulty reaching orgasm
• Erectile dysfunction
• Ejaculatory problems
• Reduced arousal Spontaneously reported rates in clinical trials were relatively low, but more systematic assessments identified more sexual dysfunction than spontaneous reporting alone. Canadian and U.S. labeling therefore recognize treatment-emergent sexual dysfunction.

Vortioxetine has also been studied in people who developed sexual dysfunction on SSRIs. Some studies favoured vortioxetine over escitalopram after switching, but Canadian health-technology reviewers concluded that the overall evidence does not establish that vortioxetine universally causes less sexual dysfunction than other antidepressants.

Therefore:

Vortioxetine may have a favourable sexual side-effect profile for some patients, but it should not be described as free of sexual dysfunction.

Canadian safety information also recognizes reports of long-lasting sexual dysfunction after serotonergic antidepressant treatment.

Does Vortioxetine Cause Weight Gain?

Major weight gain was not prominent in short-term clinical trials.

Longer-term treatment can still be associated with individual weight changes.

Weight can be influenced by:

• Appetite
• Recovery from depression
• Activity
• Sleep
• Treatment duration
• Other medications
• Individual metabolic susceptibility Canadian evidence reviews found no substantial average weight increase in short-term studies and similar rates of clinically important weight gain to placebo in a longer relapse-prevention trial.

It is therefore reasonable to describe vortioxetine as having a relatively modest average weight effect, but not as completely weight-neutral for every patient.

Does Vortioxetine Cause Sleepiness or Insomnia?

Either can occur, although neither tends to dominate its adverse-effect profile as strongly as with some other antidepressants.

Clinical trials reported:

• Somnolence
• Insomnia
• Abnormal dreams
• Dizziness in subsets of patients.

The best dosing time can therefore depend on individual experience.

Can Vortioxetine Initially Increase Anxiety or Agitation?

Yes.

Early serotonergic changes can occasionally produce:

• Anxiety
• Restlessness
• Agitation
• Irritability
• Insomnia
• Behavioural changes Patients should be monitored particularly after: Starting treatment or: Changing the dose.

Health Canada labeling also emphasizes monitoring for new or worsening emotional or behavioural changes and self-harm risk.

Can Vortioxetine Trigger Mania?

Yes.

Like other antidepressants, vortioxetine can precipitate: Mania or: Hypomania in susceptible individuals.

In short-term MDD trials, mania/hypomania was uncommon, but Canadian labeling recommends caution in patients with a history of mania or hypomania and discontinuation if a patient enters a manic phase.

Symptoms may include:

• Reduced need for sleep
• Excessive energy
• Racing thoughts
• Grandiosity
• Increased activity
• Impulsive behaviour
• Unusually elevated or irritable mood

Can Vortioxetine Cause Serotonin Syndrome?

Yes.

Serotonin Syndrome

is a rare but potentially serious condition caused by excessive serotonergic activity.

Possible symptoms include:

• Agitation
• Confusion
• Sweating
• Fever
• Tremor
• Muscle twitching
• Clonus
• Hyperreflexia
• Muscle rigidity
• Diarrhea
• Rapid heart rate Risk is greater when vortioxetine is combined with other serotonergic medications.

Which medications can cause risk of serotonin syndrome?

Examples include:

• Other SSRIs
• SNRIs
• Tricyclic antidepressants
• MAO inhibitors
• Tramadol
• Fentanyl and other serotonergic opioids
• Methadone
• Buspirone
• Lithium
• Triptans
• Tryptophan
• St. John’s Wort
• Dextromethorphan These combinations are not all automatically contraindicated, but they require medication-specific clinical assessment.

Vortioxetine and MAO Inhibitors

Vortioxetine must not be combined with: Monoamine Oxidase Inhibitors — MAOIs

because of the risk of severe serotonin toxicity.

Canadian guidance requires: At least 14 days after stopping an MAOI before starting vortioxetine and, because vortioxetine has a long half-life:

At least 21 days after stopping vortioxetine before starting an MAOI.

This longer 21-day washout after vortioxetine is important and differs from some shorter-acting serotonergic antidepressants.

Can vortioxetine cause increase Bleeding Risk?

Yes.

Serotonin contributes to platelet function.

When serotonin uptake by platelets is inhibited:

1. SERT inhibition
2. Platelet serotonin decreases
3. Platelet aggregation may become less efficient
4. Bleeding risk can increase

Risk may be greater when vortioxetine is combined with:

• Aspirin
• Ibuprofen
• Naproxen
• Other NSAIDs
• Warfarin
• Anticoagulants
• Antiplatelet medications Canadian labeling also recognizes a potential increased risk of postpartum hemorrhage with serotonergic antidepressants.

Can Vortioxetine Cause Low Sodium?

Yes.

Like other serotonergic antidepressants, vortioxetine can cause:

Hyponatremia

sometimes related to:

SIADH

Risk is particularly important in:

• Older adults

• Patients using diuretics

• People who are volume depleted Symptoms can include:

• Headache

• Weakness

• Confusion

• Memory problems

• Unsteadiness Severe hyponatremia can cause seizures or other serious neurological complications.

Does Vortioxetine Affect the Heart or QT Interval?

Vortioxetine has not demonstrated a clinically important QT-prolonging effect in a dedicated cardiac study.

Even at a 40 mg supratherapeutic dose, the upper confidence bound remained below the conventional regulatory threshold of concern.

This makes major QT effects less prominent than with some antidepressants, but cardiac risk still depends on the complete clinical situation and interacting medications.

Vortioxetine Dosage in Canada

For adults under age 65, the Canadian starting and recommended dose is: 10 mg once daily

Depending on response and tolerability:

The dose may be increased to 20 mg once daily or: Reduced to 5 mg once daily if higher doses are not tolerated.

The Canadian adult therapeutic range is therefore generally: 5–20 mg once daily and doses above 20 mg/day have not been established in controlled trials.

Patient group	Starting dose	Typical range / considerations
Adults <65	10 mg once daily	5–20 mg/day
Adults ≥65	5 mg once daily	Caution above 10 mg/day
CYP2D6 Poor Metabolizer	CPIC: 5 mg/day	Maximum recommended 10 mg/day
Strong CYP2D6 inhibitor present	Reduce existing dose by approximately 50%	Reassess when inhibitor stopped

These are prescribing-reference doses, not instructions for patients to alter their own medication.

Vortioxetine Dosage in Older Adults

For patients: 65 years or older

Canadian labeling recommends:

5 mg once daily as the starting dose.

Caution is advised at doses greater than:

10 mg/day

because controlled-trial experience at higher doses in older adults is more limited.

Older patients also have greater susceptibility to:

• Hyponatremia
• Falls
• Bone fractures
• Drug interactions
• Polypharmacy

Can Vortioxetine Be Taken with Food?

Yes.

Vortioxetine can be taken:

With or without food

because food does not meaningfully alter its overall bioavailability.

This differs from vilazodone, for which food is much more important to absorption.

How Long Does Vortioxetine Stay in the Body?

Vortioxetine has a relatively long elimination half-life of approximately: 66 hours

or close to: Three days.

This long half-life means:

• Blood concentrations change relatively gradually
• Missed doses may have less immediate impact than with very short-half-life antidepressants
• Drug interactions can persist after the medication is stopped
• A longer washout is required before beginning an MAOI

Does Vortioxetine Need to Be Tapered?

Generally:

Gradual reduction is preferred.

Despite its long half-life, abrupt discontinuation has been associated with symptoms such as:

• Headache
• Dizziness
• Mood swings
• Irritability
• Increased dreaming or nightmares
• Muscle tension
• Difficulty concentrating
• Insomnia Canadian labeling recommends gradually reducing treatment rather than stopping abruptly whenever possible.

There is no single taper appropriate for every patient.

The taper should consider:

• Current dose
• Duration of treatment
• Previous withdrawal sensitivity
• Diagnosis
• Relapse risk
• Other medications

Vortioxetine Drug Interactions

Combining vortioxetine with serotonergic drugs can increase the risk of:

• Serotonin Syndrome Important examples include:

• Other antidepressants

• Tramadol

• Fentanyl

• Methadone

• Buspirone

• Lithium

• Triptans

• St. John’s Wort

• Tryptophan supplements The total serotonergic burden matters more than the name of any one drug.

Vortioxetine and Blood Thinners

Vortioxetine can increase bleeding risk when combined with drugs affecting coagulation or platelet function, including:

• Aspirin
• NSAIDs
• Warfarin
• Anticoagulants
• Antiplatelet medications Patients receiving such combinations may require closer monitoring.

Vortioxetine and Kidney Function

Renal impairment generally has only a modest effect on vortioxetine exposure.

Canadian labeling does not routinely require a dose adjustment solely because of renal impairment, although caution is appropriate in severe renal insufficiency.

This differs from medications such as desvenlafaxine, where kidney function has a larger direct influence on drug exposure.

Vortioxetine and Liver Function

Vortioxetine undergoes extensive liver metabolism.

Available pharmacokinetic studies have not demonstrated a need for routine dose adjustment solely on the basis of mild-to-moderate hepatic impairment, although Canadian labeling advises caution because of vortioxetine’s extensive hepatic metabolism.

Patients with clinically significant liver disease require individualized assessment.

Vortioxetine and Pregnancy

Treatment during pregnancy requires individualized benefit-risk assessment.

Canadian safety information for serotonergic antidepressants includes concerns such as:

• Neonatal adaptation symptoms with late-pregnancy exposure
• Potential persistent pulmonary hypertension of the newborn
• Increased postpartum hemorrhage risk A patient should not abruptly stop vortioxetine after learning they are pregnant without discussing treatment with the prescribing clinician, because untreated or relapsing depression can itself carry important risks.

Vortioxetine and Breastfeeding

Current Canadian safety information states that vortioxetine is:

Not recommended during breastfeeding.

Individual circumstances should be discussed with the treating clinician.

Frequently Asked Questions About Vortioxetine

Is Vortioxetine the Same as Trintellix?

Yes.

Trintellix is the best-known brand name for vortioxetine. Trintellix and generic APO-Vortioxetine are currently marketed in Canada.

Is Vortioxetine an SSRI?

It inhibits SERT like an SSRI, but it also directly modulates several serotonin receptors.

It is better described as a:

• Multimodal serotonergic antidepressant.

Does Vortioxetine Increase Serotonin?

Yes, primarily by blocking SERT and reducing serotonin reuptake.

Does Vortioxetine Increase Dopamine?

Not through clinically important direct dopamine-transporter inhibition. Any dopamine effects are mainly indirect and region-dependent.

Does Vortioxetine Increase Norepinephrine?

Not through clinically important direct NET inhibition. It is not an SNRI.

Does Vortioxetine Improve Cognition?

It has been studied for cognitive symptoms in depression, but Canadian evidence reviews conclude that the overall evidence is not sufficiently consistent to claim a clear cognitive advantage.

Does Vortioxetine Cause Sexual Dysfunction?

It can. Rates may be favourable for some patients compared with certain serotonergic antidepressants, but vortioxetine is not free of sexual adverse effects.

Does Vortioxetine Cause Weight Gain?

It generally produced modest average weight changes in trials, but individual weight gain or loss can occur.

Does Vortioxetine Need to Be Taken with Food?

No.

It may be taken:

With or without food.

Which Enzyme Metabolizes Vortioxetine?

The most pharmacogenomically important enzyme is:

CYP2D6.

Does CYP2D6 Poor Metabolizer Status Matter?

Yes.

CPIC recommends starting at approximately 50% of the usual dose, for example 5 mg/day, with a maximum of 10 mg/day, or considering an alternative antidepressant.

What About CYP2D6 Intermediate Metabolizers?

CPIC recommends the standard starting dose.

What About CYP2D6 Ultrarapid Metabolizers?

CPIC recommends considering an antidepressant that is not predominantly metabolized by CYP2D6 because vortioxetine exposure may be too low for optimal efficacy.

Do Fluoxetine, Paroxetine or Bupropion Affect Vortioxetine?

Yes.

They can strongly inhibit CYP2D6 and increase vortioxetine exposure. Canadian guidance recommends reducing the vortioxetine dose by approximately half when a strong CYP2D6 inhibitor is added.

Can SLC6A4 Predict Whether Vortioxetine Will Work?

Not reliably enough for routine prescribing.

SLC6A4 encodes vortioxetine’s SERT target, but CPIC does not currently recommend antidepressant selection based on SLC6A4 genotype.

References

• [https://health-products.canada.ca/noc-ac/nocInfo?no=37866)
• [https://health-products.canada.ca/dpd-bdpp/search-fast-recherche-rapide?lang=eng&no=0156170001&no=0156170001)
• [https://health-products.canada.ca/dpd-bdpp/search-fast-recherche-rapide?lang=eng&no=0156170004&no=0156170004)
• [https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=cb1e9df4-dd74-4073-9d78-bb55593dd000)
• [https://www.ncbi.nlm.nih.gov/books/NBK563051/)
• [https://pdf.hres.ca/dpd_pm/00078813.PDF)