What are dopamine agonists? Let's learn about these drugs in simple terms!

Does anyone in your family have a movement disorder like Parkinson's disease? Or has your doctor ever told you or someone you know about a type of medication called dopamine agonists? The name may sound a bit complicated, but don't worry. Today we'll talk about it in a very simple way that you can understand. Read this as if you were talking to a friend.

Simply put, what are dopamine agonists?

To understand this, let's first learn a little about how our brains work. We have cells in our nervous system. These cells communicate, or talk, to each other through special chemicals. We call these neurotransmitters. These are like messengers.

Imagine that our nerve cell is a door with a turtle in it. To open that door, it needs the right key. Similarly, every cell has something called 'receptors' on its surface, just like a turtle. Neurotransmitters are like keys that fit those turtles. Just as when you put the key in, the turtle opens and the door opens, when the neurotransmitter connects to the receptor, the cell activates.

Dopamine is a very important key in our brain, a neurotransmitter. When you learn something, when you feel happy and satisfied, this dopamine is what creates those feelings. Also, dopamine is essential for our muscles to move properly.

Now let's get to our topic. What are Dopamine Agonists ? Simply put, these are drugs that act like dopamine . Strictly speaking, they are not dopamine, but our brain cells are fooled. The shape of these drug molecules is so similar to dopamine molecules that they fit exactly into the receptors on those cells we mentioned. So, when you take this drug, it goes and opens the doors that dopamine needs to open. In other words, these drugs do the same thing that dopamine does. Our cells don't know the difference between the two.

What does dopamine do to our body and the medical conditions that use this medication

Dopamine doesn't just help with muscle movement. It's also needed to control many other important processes in our bodies. For example:

• Heart function
• Kidney function
• Pancreas function
• Function of the pituitary gland
• Our endocrine system
• Digestive system
• Female and male reproductive systems

So you can probably understand how many problems can arise if dopamine levels in the body decrease. Dopamine agonists are used to treat many conditions caused by dopamine deficiency.

See the table below for what types of medical conditions these medications are mainly used for.

What are the benefits of using these medications?

Dopamine agonists are not just a type of medication that is given. There are several clear benefits to using them.

• Very effective results: Research has proven that these medications are very effective in treating many of the conditions we discussed above.
• Can be used for a variety of conditions: As you can see, these can be used for a wide range of conditions, from brain movement disorders to hormonal problems.
• Compatibility with other medications: This is very important. For example, when a dopamine agonist is given together with the Parkinson's drug 'Levodopa', it is possible to reduce the dose of the levodopa. Even with a lower dose, more results can be achieved. This also reduces the side effects of the levodopa.
• Lifesaving: In the dangerous condition called 'Neuroleptic Malignant Syndrome' that we discussed above, dopamine agonist medications can help save lives.

Risks and possible complications (side effects)

Like any medication, dopamine agonists can cause some side effects. Not everyone gets them, and they are more likely to occur as the dose increases. It is important to be aware of these.

Common side effects

These are the most common side effects:

• Constipation
• Dizziness
• Headache
• Stomach upset
• Heart rhythm irregularities (arrhythmia)
• Nausea and vomiting
• When you stand up suddenly, your eyes turn blue and you feel like you're going to faint (Orthostatic hypotension)
• Uncontrolled muscle twitching-like movements

Mental and behavioral changes that may occur with long-term use

When using this medication for a long time, some mental and behavioral changes may occur.

• Memory and thinking confusion
• Depression
• Impulse control issues
• Being unusually active or excited (Mania)
• Psychosis-like symptoms, such as seeing or hearing hallucinations
• Excessive daytime sleepiness and sudden sleep attacks

Impulse control issues

This is a side effect to be especially concerned about. Since dopamine is associated with our pleasure and satisfaction, when this system is stimulated by these medications, some people may lose self-control. That is, they may be tempted to do things they cannot control themselves.

Imagine, after someone who normally has no interest in gambling starts using this drug, they start gambling uncontrollably. They do it until they lose all their money. Another person may feel like shopping uncontrollably. Still others may experience hypersexuality.

What happens if you stop taking the medication suddenly? - Dopamine Agonist Withdrawal Syndrome (DAWS)

This is also very important. Never stop taking this medication suddenly or reduce the dosage without your doctor's advice. Doing so can cause a condition called Dopamine Agonist Withdrawal Syndrome (DAWS). This is not an addiction to the medication, but a reaction that occurs when the body has become accustomed to the medication and stops taking it suddenly.

In this situation, the following symptoms may occur:

• Anxiety and panic attacks
• Excessive sweating (diaphoresis)
• Restlessness
• Excessive fatigue
• Body pain
• Nausea
• Dizziness when standing up (Orthostatic hypotension)

There are several factors that increase the risk of developing this DAWS condition. See the table below.

Are there any cases where these medications should not be taken?

Yes, there are some cases where these medications are not appropriate to use. Your doctor will consider all of these factors before prescribing the medication. But it's good for you to be aware of this as well.

• During pregnancy and breastfeeding: These medications may inhibit lactation, so they are not recommended during these times.
• If you have high blood pressure (hypertension): Some dopamine agonists can increase blood pressure.
• Risk of developing certain fibrosis-type conditions: There is a risk of developing conditions such as pulmonary fibrosis, especially with older (ergot-based) dopamine agonists.
• Kidney or liver disease: Medications are removed from the body by the kidneys and liver. People with diseases of these organs may have this medication build up in their body, increasing the risk of side effects.
• If you are taking certain other medications: These cannot be taken if you are taking medications called 'monoamine oxidase inhibitors' (MAOIs), especially those used for mental illness.
• If you have previously had psychosis: These people are at increased risk of experiencing a recurrence of these symptoms with these medications.

What is the difference between Dopamine and Dopamine Agonists?

One might wonder, if dopamine is low, why can't dopamine itself be given directly as a drug, and why give a drug that acts like this? There are several reasons for that.

1. Blood-Brain Barrier: Our brain is very careful. It doesn't let everything in the blood get into the brain. It has a protective filter called the 'blood-brain barrier'. It's like a 'security guard' for the brain. Externally administered dopamine can't get past this security guard and into the brain. However, dopamine agonists can get past this barrier and go straight into the brain.

2. Side effects: When dopamine is given directly as an injection, it can cause many unwanted side effects because it affects the entire body. Dopamine agonists are designed to work in a more targeted manner.

3. Long-term use: In Parkinson's disease, a drug called 'Levodopa' is given. It goes into the brain and turns into dopamine. But over time, the dose of that drug needs to be increased, and then the side effects increase. So, by using dopamine agonists in the early stages of the disease, the start of levodopa can be delayed. This helps the patient stay well for a longer period of time.

If you or someone you know has been prescribed these medications, don't worry. These are valuable medications that can greatly improve your quality of life if used correctly. The most important thing is to maintain regular contact with your doctor and talk openly about any problems or side effects.