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Tricyclics

Tricyclics are a class of antidepressant medications that increase the availability of serotonin and norepinephrine in the brain. In Abnormal Psychology, they come up as an early drug treatment for depression, anxiety, and some chronic pain conditions.

Last updated July 2026

What is Tricyclics?

Tricyclics are a class of antidepressant medications used in Abnormal Psychology to treat depression and, in some cases, anxiety disorders, insomnia, and chronic pain. They are called tricyclics because their chemical structure has three connected rings, which is where the name comes from.

Their main action is to increase the availability of certain neurotransmitters, especially serotonin and norepinephrine. These chemicals are linked to mood, energy, alertness, and emotional regulation. Tricyclics do this by blocking reuptake, which means the brain keeps more of the neurotransmitter active in the synapse instead of pulling it back into the sending neuron right away.

That mechanism matters because it fits the biological perspective in abnormal psychology: if symptoms of depression are partly tied to neurotransmitter imbalance, then changing the way those neurotransmitters work can reduce symptoms. Tricyclics were some of the first medications built around that idea, and they helped shape how later antidepressants were developed. You will often see them discussed as part of the history of psychopharmacology, not just as a current treatment.

Common examples include amitriptyline, nortriptyline, and imipramine. Different tricyclics can be chosen for slightly different reasons, but they also share a big downside, which is side effects. Because they affect more than just serotonin and norepinephrine, they can cause dry mouth, constipation, blurred vision, and drowsiness. Those side effects are tied to their broader action in the nervous system, which is one reason they are not always the first medication a clinician reaches for.

Another big concept attached to tricyclics is safety. They can be dangerous in overdose, so prescribers think carefully about who receives them and how much is dispensed at one time. In a mental health context, that detail matters because treatment choices are not just about symptom reduction, they also have to account for risk, tolerance, and the person's overall situation.

So when you see tricyclics in Abnormal Psychology, think of them as an older but still relevant antidepressant class that shows how brain chemistry, treatment history, and medication side effects all connect.

Why Tricyclics matters in Abnormal Psychology

Tricyclics matter because they show how abnormal psychology connects symptom patterns to biological treatment. If a case describes a person with depression who is not responding well to a newer medication, a tricyclic may come up as an older option that targets serotonin and norepinephrine in a different way.

This term also helps you separate drug classes. A lot of mental health questions ask you to identify whether a medication is an antidepressant, an anxiolytic, or a mood stabilizer, and tricyclics belong in the antidepressant group. They are especially useful for understanding how antidepressants are not all the same, even when they are all used for mood symptoms.

Tricyclics also show the tradeoff between effectiveness and side effects. In abnormal psychology, that tradeoff comes up often because treatment is rarely a simple yes or no choice. A medication can help symptoms but still be less preferred if it causes heavy drowsiness or is risky in overdose.

Finally, tricyclics connect the course to the history of psychiatric treatment. They are part of the move from older biological explanations of mental illness to more refined medication approaches. If you understand tricyclics, you can better explain why clinicians moved toward more selective antidepressants later on and why medication choice depends on the person's diagnosis, symptoms, and safety needs.

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How Tricyclics connects across the course

Neurotransmitters

Tricyclics work by changing neurotransmitter activity, especially serotonin and norepinephrine. If you do not know what neurotransmitters are, tricyclics can feel like random chemistry. In abnormal psychology, neurotransmitters are the bridge between brain biology and mood symptoms, so this term helps you see why a medication can affect emotion and energy.

Antidepressants

Tricyclics are one type of antidepressant, but they are not the whole category. This connection matters when you are sorting medications by purpose and mechanism. Some antidepressants are more selective and tend to have fewer side effects, while tricyclics are older and broader in action.

Selective Serotonin Reuptake Inhibitors (SSRIs)

SSRIs are often compared with tricyclics because both are used to treat depression, but SSRIs act more selectively on serotonin. That difference helps explain why SSRIs are usually preferred first in many cases. Tricyclics are a useful comparison point when you are asked why one antidepressant might be chosen over another.

Anxiolytics

Some tricyclics can be used for anxiety symptoms, which makes them easy to confuse with anxiolytics. The difference is that tricyclics are still antidepressants first, while anxiolytics are mainly designed to reduce anxiety. This distinction shows up in diagnosis and treatment matching.

Is Tricyclics on the Abnormal Psychology exam?

A quiz item may ask you to identify tricyclics from a medication list, match them to their neurotransmitter effects, or explain why they can treat depression but also cause dry mouth and drowsiness. In a case study, you might need to decide whether a patient description fits an older antidepressant class or a more selective one like an SSRI.

You can also see tricyclics in short-answer prompts about biological treatments. The task is usually to trace the path from symptoms to brain chemistry to medication choice. If the question mentions overdose risk, side effects, or use for chronic pain, those are clues that the answer should include tricyclics rather than a more general antidepressant label.

Tricyclics vs Selective Serotonin Reuptake Inhibitors (SSRIs)

Both tricyclics and SSRIs treat depression, so they are easy to mix up. Tricyclics affect both serotonin and norepinephrine and tend to have more side effects, while SSRIs are more selective for serotonin and are often better tolerated. If a question emphasizes an older medication with dry mouth, blurred vision, or overdose danger, tricyclics are usually the better match.

Key things to remember about Tricyclics

  • Tricyclics are an older class of antidepressants used in Abnormal Psychology to treat depression and sometimes anxiety or chronic pain.

  • They work by increasing the availability of serotonin and norepinephrine, which links them to the biological perspective on mental disorders.

  • Their three-ring chemical structure gives them the name tricyclics, but the test-worthy part is their mechanism and side effects.

  • Dry mouth, constipation, blurred vision, and drowsiness are common because these drugs affect more than one system in the brain and body.

  • They can be dangerous in overdose, so safety and prescribing caution are part of the concept, not just the medicine.

Frequently asked questions about Tricyclics

What is tricyclics in Abnormal Psychology?

Tricyclics are a class of antidepressant medications used to treat depression and sometimes anxiety or chronic pain. In Abnormal Psychology, they are studied as an older biological treatment that works by increasing serotonin and norepinephrine activity in the brain.

How do tricyclics work?

Tricyclics block the reuptake of neurotransmitters, especially serotonin and norepinephrine, so more of those chemicals stay active in the synapse. That can improve mood and reduce some symptoms of depression. The downside is that they also affect other body systems, which leads to more side effects.

Are tricyclics the same as SSRIs?

No. Both are antidepressants, but tricyclics are older and less selective. SSRIs mainly target serotonin reuptake, while tricyclics affect both serotonin and norepinephrine and often cause more side effects.

Why are tricyclics not usually the first antidepressant prescribed?

They can be effective, but they often cause more side effects than newer antidepressants and can be dangerous in overdose. That makes them less convenient for many patients, even though they still have a place in treatment for some symptoms or when other medications do not work well.

Tricyclics in Abnormal Psychology | Fiveable