For many of us, "allergic" has become a very common thing now, hasn't it? As soon as a little dust gets on our body, we start itching all over. For some, when they wake up in the morning, they start sneezing, their nose runs like water. Their eyes become red and teary. Cetirizine is a medicine that many of us know and use at times like this. So today, let's talk about what Cetirizine is, how to use it, and what important things we need to know about it.
Simply put, what is Cetirizine?
Cetirizine is a medicine used to prevent and treat allergy symptoms. Imagine that you are allergic to something (such as dust, pollen, or certain foods) and your body's immune system produces a chemical called histamine to fight the foreign substance.
This histamine is what actually causes all the allergic symptoms like itching, hives, runny nose, sneezing, and red eyes.
So, this medicine called Cetirizine, or what we commonly call it, is an 'antihistamine' . What this medicine does is stop the action of that histamine. It blocks it. Then those uncomfortable allergic symptoms gradually decrease. Do you understand?
Things you need to tell your doctor before taking this medicine
Before a doctor prescribes this medicine for you, it is very important to give him a complete description of your health condition. Because some medical conditions require caution when using this medicine. Be sure to mention these points in particular:
- If you have kidney disease .
- If you have liver disease .
- If you have previously been allergic to Cetirizine, Hydroxyzine, or any other medicine, food, or preservatives.
- If you are pregnant or expecting a baby.
- If you are a breastfeeding mother.
Based on this information, the doctor will decide whether this medication is right for you or whether the dosage needs to be changed.
How exactly do you use this medicine?
The method of using this medicine is very simple.
- This pill should be taken orally with a glass of water.
- You can take this before or after meals. It doesn't make much difference.
- The most important thing is to take the right dose at the right time. Don't take more than your doctor tells you to. Usually, you'll be prescribed one pill a day.
- Sometimes you may need to continue taking this medicine for a few days to get better, so don't stop taking it just because you don't feel better after one day.
If you give it to children...
If you are giving this medicine to children, you should be especially careful. Although it is prescribed for children over 6 years of age for some conditions, you should definitely talk to your doctor about it and give him the dosage he recommends.
What to do if you take too much medicine? (Overdose)
If you accidentally take too much of this medicine, go to the nearest hospital Emergency Department (ETU) immediately. Alternatively, you can call the National Poisons Information Centre at the Colombo National Hospital for advice.
This medicine has been prescribed for you only. Never share your medicine with others. Even if someone has the same symptoms as you, this medicine may not be suitable for their other medical conditions.
What if I miss a dose of medication?
If you miss a dose, take it as soon as you remember. However, if it is almost time for your next dose (for example, within a few hours), skip the missed dose and take your next dose at the scheduled time. Never take a double dose.
Other things that may interact with Cetirizine
Some medications and drinks can interact with Cetirizine and cause side effects such as increased drowsiness. So be aware of these things:
- Alcohol: Drinking alcohol while taking cetirizine can greatly increase drowsiness and dizziness.
- Some medications for anxiety or sleep.
- Some strong painkillers (e.g. Narcotic medications for pain such as Tramadol).
- Medicines for colds or other allergies.
So, when you go to see your doctor, tell him about all the medications you are currently taking (including over-the-counter medications, vitamins, and supplements). Also, don't forget to tell him if you smoke or drink alcohol.
Things to keep in mind when taking this medicine
- Drowsiness and dizziness: Some people may feel drowsy or dizzy when taking this medication. Therefore, avoid activities that require high alertness, such as driving or operating machinery, until you know how this medication affects you.
- Elderly people should be careful: Especially if you are elderly, be careful when getting up from a sitting or standing position suddenly. This will reduce the chance of dizziness and falling.
- Dry mouth: Dry mouth is also common. Chewing sugar-free gum and drinking plenty of water can help. If this problem persists or is severe, talk to your doctor.
- Symptoms: If your allergy symptoms do not subside, inform your doctor about that as well.
Possible side effects of Cetirizine
Like any medicine, Cetirizine can cause side effects. However, not everyone gets them. The table below will help you understand this more clearly.
| Cetirizine side effects | |
|---|---|
| Serious side effects that require immediate medical attention: | |
| Severe allergic reactions | Skin rash, severe itching, swelling of the face, lips, tongue or throat. (This is an emergency!) |
| Side effects that are usually not serious, but should be reported to your doctor if they persist: | |
| Drowsiness | A common condition that occurs in many people. |
| Dry mouth | Drinking water can provide relief. |
| Dizziness | Rest can bring peace. |
| Fatigue | Feeling tired in the body. |
Take-Home Message
- Cetirizine is an antihistamine that is used to control allergic symptoms (skin rashes, itching, runny nose).
- Before taking this medicine, be sure to tell your doctor about any other medical conditions you have (especially kidney and liver disease) and any other medications you are taking.
- Since taking the medicine can make you drowsy, be very careful when doing tasks that require attention, such as driving.
- Never share your prescribed medication with anyone else.
- If you accidentally take too much medicine, go to a hospital emergency room (ETU) immediately or contact the National Poisons Information Center.
- If you experience severe allergic symptoms, such as swelling of the face, lips, or throat, it is an emergency. Seek immediate medical attention.


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