Do you sometimes have a cough that just doesn't go away, have difficulty breathing, or feel like your chest is constricting? You may also wonder if this is due to
asthma or something else. Sometimes
, even a doctor can have a hard time telling you right away. In such cases, there is a special test that is done to find out exactly how sensitive your lungs are to asthma. Today, we are going to talk about the drug "Methacholine" used in that test.
Simply put, what is methacholine?
The first thing to remember is
that methacholine is not a cure for asthma. It is a drug that is used only in a diagnostic test to determine whether you have asthma. This test is called the "Methacholine Challenge Test." Think about it, some of us are a little sensitive, aren't we? We get allergies quickly to even the smallest things. Similarly, the airways in the lungs of a person with asthma are a little more sensitive than those of a normal person. So in this test, you inhale a very small amount of methacholine and see how your lungs react to it. If you have asthma, your airways will start to narrow a little. That change can be measured with special equipment, allowing the doctor to come to a clear conclusion about your condition.
Things you need to tell the doctor before this test
This is very important. Before giving methacholine, it is essential that your doctor knows your complete medical history. This is because some medical conditions can make it dangerous to use this medicine. See the table below. If you have any of these conditions,
be sure to tell your doctor.
| Your medical condition or condition | Why is it important to inform the doctor? |
|---|
| High blood pressure | This medicine may cause changes in blood pressure. |
| A history of heart disease or heart attack | Because it can affect heart function. |
| A history of stroke | Because blood vessels can be affected. |
| Aneurysm (bulging of a blood vessel) | Because this is a very dangerous situation. |
| Seizures | Because there is a risk of seizures due to the effects of the medicine. |
| Thyroid disease | Because hormone levels can be affected. |
| If you are pregnant or trying to get pregnant | To avoid taking unnecessary risks during pregnancy. |
| If the baby is breastfed | Be aware of the possibility of the medicine passing to the baby through breast milk. |
| Allergy to any other medicine or food | To find out if there is a possibility of an allergy to this medicine. |
How is this medicine administered to the body?
This test is only done
under medical supervision in a hospital or clinic . You will not be given this medicine to take home. This medicine comes in a liquid form. It is given to you using a special device called
a nebulizer . You may have seen young children inhaling the vapor when they have a cold. This is the same. This machine turns the liquid medicine into a very fine vapor (aerosol). Then you have to breathe in that vapor through your mouth, or through your mouth and nose. Usually, children over 5 years old can also have this test if necessary, but there are times when special care is taken.
Since this is given in a hospital, the chance of an ' overdose ', that is, taking too much of the medicine, is very low. However, if you think that this has happened, you should inform the medical staff immediately. In an emergency, you should go directly to the Emergency Treatment Unit (ETU) .
Other medications that may interact with this medicine
If you are taking medication for other conditions, it is very important to tell your doctor about all of your medications. Some medications can affect the results of the methacholine test. This means that you may have asthma that you don't have, or that you may have more of it than you actually do.
| Drug type / category | Things to consider |
|---|
| Inhalers used for asthma (e.g. Salbutamol, Salmeterol, Fluticasone, Ipratropium, Tiotropium) | These can affect the accuracy of the test because they widen the airways. Your doctor will advise you whether you should stop taking these before the test. |
| Beta-blockers (e.g. Metoprolol, Propranolol) | These medications, often given for high blood pressure and heart disease, can alter the response of the lungs. |
| Steroid medications (e.g. Prednisone, Cortisone) | These can reduce the sensitivity of the lungs, which can affect the results of the test. |
| Theophylline | This medication, which is used to treat asthma, can also affect the test. |
Be sure to tell your doctor about all medications, vitamins, herbal remedies, and supplements you are taking.
Side effects that may occur due to this medicine
Like any medicine, methacholine can cause side effects in some people. However, there is nothing to worry about as this test is performed under the full supervision of doctors and nurses. If any discomfort occurs, they are ready to treat it immediately.
Side effects that should be reported to your doctor immediately: Side effects that are usually not serious, but should be reported to your doctor if they persist.
| Side effect | Description |
|---|
| Allergic reactions | Skin rash, itching, swelling of the face, lips, tongue or throat. |
| Severe difficulty breathing | Chest tightness, wheezing. |
| Headache | Slight headache. |
| Dizziness | Feeling a little dizzy. |
| Sore throat | A slight itching or soreness in the throat. |
| Itching | Slight skin itching. |
This list may not include all possible side effects. If you experience any other discomfort, please inform the medical staff immediately.
Take-Home Message
- Methacholine is not a treatment for asthma. It is only a drug used in a test to diagnose asthma.
- This test is always done in a hospital or clinic, under medical supervision. This medicine is not allowed to be taken home.
- Before the test, be sure to tell your doctor about all your medical conditions and all medications you are taking (including traditional medicines).
- If you experience severe difficulty breathing or allergic symptoms during the test, notify the medical staff immediately.
- If you have any questions about this test, don't hesitate to ask your doctor.
Methacholine, Methacholine, Asthma, Difficulty breathing, Lungs, Respiratory diseases, Medical tests
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