Has your doctor prescribed you a medication for a condition like depression or chronic pain? Have you heard of the name 'tricyclic antidepressants' among those medications? Although these are a somewhat older generation of medications, they are still very useful in some cases. So today, let's talk about all about these tricyclic antidepressants, or ``TCAs'' for short.
Simply put, what are these tricyclic antidepressants (TCAs)?
Tricyclic antidepressants (TCAs) are a class of medications that help control the symptoms of major depressive disorder. Although they have the word "antidepressant" in their name, doctors also prescribe them for a variety of other conditions.
These are also called "first-generation" antidepressants because they were the first antidepressants to be discovered. They are called "tricyclic" because they have three rings in their chemical structure.
Nowadays, because newer medications for depression are safer and have fewer side effects (such as SSRIs), doctors are prescribing TCAs for depression less often. However, they may be more effective for some people who have not responded to other medications. They are also commonly used for other conditions.
What are the types of TCAs? What types of illnesses do doctors prescribe them for?
There are several main types of TCAs used in Sri Lanka and around the world. Check to see if the medication your doctor prescribed is one of these.
| Generic Name | Commonly used cases |
|---|---|
| Amitriptyline | Prevent depression, chronic pain, nerve pain, and migraines |
| Imipramine | Depression, bedwetting in young children |
| Nortriptyline | Depression, chronic pain |
| Clomipramine | It is very effective for Obsessive-Compulsive Disorder (OCD), a condition characterized by unwanted thoughts and actions. |
| Doxepin | Depression, anxiety, insomnia |
In addition to the depression and OCD mentioned above, doctors prescribe this medication for several other conditions. This is called "off-label use." This means that the drug is given for a condition other than the one for which it was approved, when research has shown that it is useful for another condition.
- Chronic pain: Especially nerve-related pain, such as diabetic neuropathy and postherpetic neuralgia.
- To prevent migraines: Control frequent migraines.
- Insomnia: Some people are given low doses to help them sleep.
- Anxiety disorders
- Fibromyalgia: Pain and fatigue throughout the body.
- Bedwetting: This condition is sometimes recommended for young children.
How does this medicine work in the body?
To put it simply, our brains contain chemicals that transmit messages between nerve cells. We call these neurotransmitters . `Norepinephrine` and `Serotonin` are two very important neurotransmitters that control our mood, happiness, and behavior.
These levels can be low in conditions like depression. TCAs work by increasing the levels of these neurotransmitters, ``Norepinephrine`` and ``Serotonin`` in the brain, improving communication between nerve cells.
When controlling pain, these medications block pain signals from the spinal cord to the brain.
But along with this process, other receptors in the body are also blocked. That's why side effects like dry mouth and difficulty urinating occur.
What are the side effects and risks of these medications?
TCAs have a slightly higher incidence of side effects than newer medications. However, not everyone gets them. If they do, they will lessen over time as the body gets used to the medication.
Common side effects
- Dry mouth
- Constipation
- Dizziness
- Drowsiness
- Blurred vision
Other side effects
- Difficulty urinating or urinary retention
- Increased heart rate (Tachycardia)
- Orthostatic hypotension (low blood pressure when standing or getting up)
- Increased appetite and weight gain
If these side effects bother you, be sure to talk to your doctor before stopping the medication. He or she may be able to adjust the dosage or suggest another solution.
Cases requiring special attention
- If you have heart disease: TCAs can affect some heart conditions, so your doctor may want to do an EKG before starting this medication.
- If you have epilepsy/fits: This medicine may slightly increase your risk of seizures.
- If you are pregnant or planning to become pregnant: TCAs are not very safe during pregnancy, so it is important to talk to your doctor about this.
Important: There has been a small increased risk of suicidal thoughts when young people under the age of 25 start using this medicine. If you or your child have these thoughts, tell your doctor immediately.
Should you be worried about overdose?
Yes, this is something we should definitely pay attention to. TCAs are a class of drugs that can cause serious toxicity if taken in overdose.
But remember, this risk does not arise as long as you take the exact dosage prescribed by your doctor. An overdose only occurs if you take too much medication by mistake, ignorance, or intentionally.
Therefore, always take your medicine exactly as your doctor tells you. Keep your pills in a safe place out of reach of children and pets.
Symptoms of overdose
- Heartbeat abnormalities
- Very low blood pressure
- Extreme drowsiness
- Seizures
- Tremors
- Dementia
- Coma state
If you or someone you know experiences any of these symptoms, do not delay. Immediately call 1990 for an ambulance, or go to the nearest hospital Emergency Department (ETU). If necessary, you can also call the National Poison Information Centre at the Colombo National Hospital for advice.
Take-Home Message
- TCAs are an older, but very useful class of medications that treat a variety of conditions, including depression, chronic pain, and migraines.
- These have slightly more side effects than newer medications, but not everyone gets them. If you have any bothersome side effects, talk to your doctor.
- Never change the dosage of medication or stop taking it suddenly without your doctor's advice.
- Always keep medicine in a safe place out of the reach of children.
- Be aware of the symptoms of an overdose. If you suspect such a thing, go to the nearest hospital Emergency Department (ETU) immediately.
- If you have any questions about your medication, its effectiveness, or side effects, don't be afraid to ask your doctor. He or she is there to help you.
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