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Tricyclic Antidepressants – Mechanism, Uses & Side Effects
Learn about tricyclic antidepressants: how they work, their use in depression and pain, and common side effects compared to modern drugs.
Add as Preferred SourceThings worth knowing about "Tricyclic antidepressants (TCAs)"
Tricyclic antidepressants (TCAs) are among the oldest classes of antidepressants, developed in the 1950s.
TCAs work by blocking the reuptake of serotonin and norepinephrine, increasing their concentrations in the brain. TCAs also affect other neurotransmitters such as histamine and acetylcholine, which explains their broad efficacy as well as their side effect profile.
TCAs are used to treat moderate to severe depression, but also chronic pain, anxiety disorders, and sleep disturbances. Common examples include amitriptyline, imipramine, and nortriptyline. Because they act on multiple neurotransmitter systems, they can have mood-enhancing, sedative, and analgesic properties.
However, TCAs are associated with relatively frequent side effects, including dry mouth, weight gain, fatigue, cardiac arrhythmias, and blood pressure fluctuations. Today, they are generally prescribed when modern antidepressants (e.g., SSRIs, SNRIs) are ineffective. Supportive natural approaches such as exercise, diet, mindfulness, and herbal remedies may further promote mental well-being.
Key Facts about TCAs
- Oldest antidepressant class, act via serotonin and norepinephrine reuptake inhibition
- Used for depression, chronic pain, and anxiety disorders
- Higher risk of side effects, often used in treatment-resistant cases
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