Tricyclic Antidepressants; Uses, Side Effects, Interactions

Last updated: February 7, 2026Reviewed date: February 7, 2026Reading time: 5 min read
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Tricyclic antidepressants with anticholinergic and sedative properties. Amitriptyline appears to prevent the re-uptake of norepinephrine and serotonin at nerve terminals, thus potentiating the action of these neurotransmitters. Amitriptyline also appears to antagonize cholinergic and alpha-1 adrenergic responses to bioactive amines. or Tricyclic antidepressants are a class...

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Article Summary

Tricyclic antidepressants with anticholinergic and sedative properties. Amitriptyline appears to prevent the re-uptake of norepinephrine and serotonin at nerve terminals, thus potentiating the action of these neurotransmitters. Amitriptyline also appears to antagonize cholinergic and alpha-1 adrenergic responses to bioactive amines. or Tricyclic antidepressants are a class of medications that are used primarily as antidepressants. Tricyclic antidepressants (often abbreviated to TCAs) are a class of drugs that are traditionally used...

Key Takeaways

  • This article explains Types of Tricyclic Antidepressants in simple medical language.
  • This article explains Overall Classifications of Tricyclic Antidepressants in simple medical language.
  • This article explains Mechanism of Actions of Tricyclic Antidepressants in simple medical language.
  • This article explains Indications/Uses of Tricyclic Antidepressants in simple medical language.
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Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

  • Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
  • New weakness, severe pain, high fever, or symptoms after a serious injury.
  • Any symptom that feels urgent, unusual, or unsafe for the patient.
1

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2

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Definition

Tricyclic antidepressants with anticholinergic and sedative properties. Amitriptyline appears to prevent the re-uptake of norepinephrine and serotonin at nerve terminals, thus potentiating the action of these neurotransmitters. Amitriptyline also appears to antagonize cholinergic and alpha-1 adrenergic responses to bioactive amines.

or

Tricyclic antidepressants are a class of medications that are used primarily as antidepressants. Tricyclic antidepressants (often abbreviated to TCAs) are a class of drugs that are traditionally used to treat depression; however, they may also be used in the treatment of other mood disorders, to relieve chronic nerve-related pain, to reduce bed-wetting, to manage obsessive-compulsive behaviors, and to prevent.T hey are named after their chemical structure, which contains three rings of atoms. Although TCAs are sometimes prescribed for depressive disorders, they have been largely replaced in clinical use in most parts of the world by newer antidepressants such as selective serotonin reuptake inhibitors (SSRIs), serotonin–norepinephrine reuptake inhibitors (SNRIs) and norepinephrine reuptake inhibitors (NRIs).

Types of Tricyclic Antidepressants

Those that preferentially inhibit the reuptake of serotonin (by at least 10-fold over norepinephrine) include

  • Butriptyline (relatively weak serotonin reuptake inhibitor)
  • Clomipramine
  • Imipramine
  • Trimipramine  (relatively weak serotonin reuptake inhibitor)

Those that preferentially inhibit the reuptake of norepinephrine (by at least 10-fold over serotonin) include

  • Desipramine
  • Dibenzepin
  • Lofepramine
  • Maprotiline – can be classed with the TCAs though more frequently classed with the TeCAs
  • Nortriptyline
  • Protriptyline

Whereas either fairly balanced reuptake inhibitors of serotonin and norepinephrine or unspecified inhibitors include

  • Amitriptyline
  • Amitriptylinoxide
  • Amoxapine  – can be classed with the TeCAs but more frequently classed with the TCAs
  • Demexiptiline
  • Dimetacrine
  • Dosulepin
  • Doxepin
  • Fluacizine
  • Imipraminoxide
  • Melitracen
  • Metapramine
  • Nitroxazepine
  • Noxiptiline
  • Pipofezine
  • Propizepine
  • Quinupramine

And the following are TCAs that act via main mechanisms other than serotonin or norepinephrine reuptake inhibition

  • Amineptine – norepinephrine-dopamine reuptake inhibitor
  • Iprindole – 5-HT2 receptor antagonist
  • Opipramol  – σ receptor agonist
  • Tianeptine atypical μ-opioid receptor agonist

Overall Classifications of Tricyclic Antidepressants

Mechanism of Actions of Tricyclic Antidepressants

Tricyclic antidepressants work by inhibiting the neuronal reuptake of the neurotransmitters norepinephrine and serotonin. It binds the sodium-dependent serotonin transporter and sodium-dependent norepinephrine transporter preventing or reducing the reuptake of norepinephrine and serotonin by nerve cells. Depression has been linked to a lack of stimulation of the post-synaptic neuron by norepinephrine and serotonin. Slowing the reuptake of these neurotransmitters increases their concentration in the synaptic cleft, which is thought to contribute to relieving symptoms of depression. In addition to acutely inhibiting neurotransmitter re-uptake, imipramine causes down-regulation of cerebral cortical beta-adrenergic receptors and sensitization of post-synaptic serotonergic receptors with chronic use. This leads to enhanced serotonergic transmission.

Indications/Uses of Tricyclic Antidepressants

The TCAs are used primarily in the clinical treatment of mood disorders such as

Contra-Indications of Tricyclic Antidepressants

  • Overactive thyroid gland
  • Decreased blood Platelets
  • Decreased neutrophils a type of white blood cell
  • Schizophrenia
  • Behaving with excessive cheerfulness and activity
  • The mild degree of mania
  • Manic-depression
  • Having thoughts of suicide
  • Alcoholism
  • Serotonin syndrome – adverse drug interaction
  • Closed-angle glaucoma
  • Heart attack within the last 30 days
  • Coronary artery disease
  • Prolonged QT interval on EKG
  • Abnormal heart rhythm
  • Disease of the heart and blood vessels
  • Abnormal EKG with QT changes from birth
  • Stroke
  • Liver problems
  • Kidney disease with a reduction in kidney function
  • Enlarged prostate

Side Effects of Tricyclic Antidepressants

The most common

More common

Less common

Drug Interactions of Tricyclic Antidepressants

Tricyclic antidepressants  may interact with the following drugs, supplements & may decrease the efficacy of the drug

Referances

Tricyclic Antidepressants; Uses, Side Effects, Interactions

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Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
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OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
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Avoid these mistakes

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Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

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Doctor to discuss: Orthopedic / spine specialist, physical medicine doctor, or qualified clinician
Tests to discuss with doctor
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  • MRI discussion if severe nerve symptoms, weakness, bladder/bowel problem, or persistent symptoms
Questions to ask
  • What is the most likely cause of my symptoms?
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  • Which tests are really needed now?
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  • Is physiotherapy, posture correction, or activity modification needed?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Tricyclic Antidepressants; Uses, Side Effects, Interactions

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

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Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

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