What are tricyclic antidepressants? Let's learn exactly about these medications!

Have you ever been prescribed an old-fashioned medication by a doctor for depression or another condition? It might be one of the tricyclic antidepressants (TCAs). While the name may sound a bit scary, these are still very useful medications that are used for many conditions. So today, let’s talk about these TCA medications in a simple, easy-to-understand way.

Simply put, what are these tricyclic antidepressants (TCAs)?

Tricyclic antidepressants, or TCAs for short, are a class of medications that help control the symptoms of a mental illness called major depressive disorder . However, doctors these days prescribe these medications for other conditions than just depression.

These TCAs were one of the first classes of drugs discovered to treat depression. That's why we call them "first-generation" antidepressants. But now that newer, safer medications (such as SSRIs) have become available to treat depression, doctors are less likely to prescribe these TCAs as first-line drugs for depression.

These drugs are called "tricyclics" because of their chemical structure. They have three rings. That's what the name means, there's nothing to think about.

What types of drugs belong to the TCA group?

These are some of the main TCA medications used in Sri Lanka and around the world, along with their brand names. See if the medication your doctor has prescribed is one of these.

In addition, the TCA drug Clomipramine (Anafranil®) is used specifically to treat a condition called obsessive-compulsive disorder (OCD) .

What conditions are TCA medications used for?

These medications are primarily approved to treat depression. But as I said before, doctors these days don't give them first for depression. Only if other newer medications (like SSRIs) don't work, maybe a TCA might be started. Because there are times when these older medications work better than the newer medications for some people.

However, TCAs are now most popular for treating conditions other than those for which they are approved. We call this "off-label" use. That is, even though the drug has not been approved by the Food and Drug Administration for that condition, medical research has shown that the drug is useful for that condition.

Here are some "off-label" uses of TCAs:

• To prevent migraines: For those who suffer from frequent migraines, this medication helps control their occurrence.
• Insomnia: Some TCAs, when given in low doses, can help you sleep better.
• Anxiety disorders: These are also used to control various anxiety conditions.
• Chronic pain: This is one of the main uses of TCAs today. They are particularly effective for neuropathic pain . For example:
• Diabetes-related neuropathy
• Postherpetic neuralgia (pain that occurs after chickenpox)
• Fibromyalgia condition
• Bedwetting: This medication is sometimes given in low doses to control nighttime urination in children.

What is the difference between the new drugs (SSRIs) and these old drugs (TCAs)?

Both are classes of drugs that treat depression. But there are some key differences. You can easily understand this by looking at the table below.

How does this TCA medication work inside the body?

This is very simple to understand. The nerve cells in our brain use chemicals called neurotransmitters to send messages to each other. Like postmen. Two of these neurotransmitters are very important in controlling our mood. They are norepinephrine and serotonin .

In conditions like depression, the levels of these chemicals in the brain decrease. TCA medications work by increasing the levels of norepinephrine and serotonin in the brain. This allows for better communication between nerve cells, and improves mood.

Researchers have also discovered how these drugs reduce pain. They say that these drugs block pain signals from traveling through our spinal cord to the brain, reducing the amount of pain we feel.

How should I take the medicine and what are the side effects?

TCAs are usually available as tablets or capsules. It is very important to take the exact dose prescribed by your doctor.

Common side effects

Like all medications, this one has side effects. But not everyone gets them. Some people may get one or two, while others may not experience any.

If you are bothered by these side effects, talk to your doctor without stopping the medication. They may be able to be managed by changing the dosage or using another method.

Who should be especially careful about TCA medications?

Doctors are very careful when prescribing this medication to some people. If you have any of these conditions, you should definitely tell your doctor before starting the medication.

• If you have heart disease: TCA medications can worsen some heart conditions, so your doctor may order an electrocardiogram (EKG) to check your heart function before starting the medication.
• If you have epilepsy: This medicine may slightly increase your risk of seizures.
• If you are pregnant or planning to become pregnant: TCA medications are not very safe during pregnancy. Some studies have found that they can affect the fetus. So be sure to talk to your doctor about this.

A very important warning

In some cases, children under 25 years of age, young children, and young adults may experience an increase in suicidal thoughts or behavior when they start using this medicine, especially in the first few weeks.

Is it possible to overdose on TCA medication?

Yes, you can. In fact, among the types of antidepressants prescribed, TCAs are the group of drugs with the highest risk of overdose. That's why you should never take more than the dose your doctor prescribes.

An overdose can happen by mistake, ignorance, or on purpose. So always keep your medication safely out of the reach of children and pets.

Symptoms of an overdose

• Heartbeat abnormalities (changes in rhythm)
• Blood pressure drops too low
• Extreme drowsiness
• Seizures
• Tremors
• Confusion
• Coma

A TCA overdose is a medical emergency . It can be fatal if not treated promptly. If you have any suspicion that this has happened to you or someone else, go to the nearest hospital Emergency Department (ETU) immediately. If necessary, you can also call the National Poisons Information Centre at the Colombo National Hospital for advice.

When to talk to the doctor

If you are using a TCA medication, it is important to stay in regular contact with your doctor. Be sure to talk to your doctor if you have any of the following conditions:

• If the side effects bother you a lot: If you feel like "this is a little too much to bear," tell your doctor.
• If your symptoms do not improve or worsen: If there is no improvement after about 4 weeks or if the symptoms seem to be getting worse, tell your doctor.
• If you are thinking of stopping the medication: Never stop taking this medication suddenly. Doing so may cause withdrawal symptoms. If you do stop, do so as directed by your doctor, gradually reducing the dosage.

Although this medicine is old, it is very useful if used correctly . Therefore, if you have any questions, fears, or doubts about this medicine, ask your doctor about it. He is ready and willing to help you.