If you take an extra dose, you might get some of the common side effects. If this happens or you're concerned, contact your doctor. Like all medicines, cetirizine can cause side effects, although not everyone gets them.
The most common side effect of cetirizine is feeling sleepy and tired. This happens in more than 1 in 10 people. Talk to your doctor or pharmacist if this side effect bothers you or does not go away.
Other common side effects of cetirizine happen in more than 1 in people. Talk to your doctor or pharmacist if these side effects bother you or do not go away:. Children are more likely to get diarrhoea, sneezing or a blocked and runny nose than adults. Call your doctor straight away if you have bruising or bleeding that's more than normal.
In rare cases, it's possible to have a serious allergic reaction anaphylaxis to cetirizine. These are not all the side effects of cetirizine. For a full list, see the leaflet inside your medicines packet. Cetirizine can be used in pregnancy. There is no good evidence that it causes harm to the baby. However, other antihistamines such as loratadine may be recommended as there is more information about its use in pregnancy.
If your doctor or health visitor says your baby is healthy, you can take cetirizine while breastfeeding. There is some information available which shows that only very small amounts get into breast milk.
Cetirizine has been used for many years while breastfeeding without side effects in babies. If your baby is not feeding as well as usual, seems unusually sleepy, or if you have any other concerns about your baby, talk to your doctor, pharmacist, health visitor or midwife.
Some medicines can increase the chances of you having side effects with cetirizine. Check with your pharmacist or doctor if you're taking any medicine that makes you drowsy, gives you a dry mouth, or makes it difficult for you to pee. Taking cetirizine might make these side effects worse. There might be a problem taking some herbal remedies and supplements alongside cetirizine, especially ones that cause sleepiness, a dry mouth, or make it difficult to pee.
Tell your doctor or pharmacist if you're taking any other medicines, including herbal medicines, vitamins or supplements. Cetirizine is a type of medicine called an antihistamine. When you come into contact with something you're allergic to, such as pollen, animal hair or fur, your body produces a chemical called histamine.
Usually histamine is a useful substance, but in an allergic reaction it causes unpleasant symptoms including itchy, watery eyes, a running or blocked nose, sneezing and skin rashes. For example, if you have a reaction to an insect bite, you may only need to take cetirizine for a day or two. You may need to take cetirizine for longer if you're taking it to prevent symptoms — for example, to stop hay fever when the pollen count is high.
Talk to your doctor or pharmacist if you're unsure how long you need to take cetirizine for. However it's best to take cetirizine only for as long as you need to. If you take it regularly over a long period there's a very small chance of severe itching if you stop treatment suddenly. If you've been taking cetirizine every day for a long time, talk to your doctor before stopping it. It's best not to drink alcohol while you're taking cetirizine as it can make you feel sleepy.
Cetirizine is classed as a non-drowsy antihistamine, but it's still possible to feel sleepy after taking it. If this happens to you, do not drive a car, ride a bike, use tools or machinery until you do not feel tired anymore.
It's an offence to drive a car if your ability to drive safely is affected. It's your responsibility to decide if it's safe to drive. If you're in any doubt, do not drive. Talk to your doctor or pharmacist if you're unsure whether it's safe for you to drive while taking cetirizine. UK has more information on the law on drugs and driving.
That's because it's less likely to make you feel sleepy than sedating antihistamines, such as Piriton chlorphenamine. Most people already have Adobe Reader installed, so this makes the transition seamless. You can get Adobe Reader for free here.
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Claritin is broken down in the liver by enzymes that other drugs can inhibit. This may lead to Claritin building up in the body, which increases the risk of side effects.
Everyone reacts to medications differently, but Claritin and Zyrtec may have the following side effects:. Some people experience a severe allergic response called anaphylaxis after taking antihistamines.
A person should seek emergency medical attention if any of the following symptoms are present:. Some antihistamines are safe for children, but it is a good idea to talk with a doctor or check the label carefully before giving antihistamines to a child. In , a review found that some antihistamines may be problematic during pregnancy. However, the authors noted that there was no evidence linking cetirizine or loratidine to birth defects.
A study published in noted that 10—15 percent of women use antihistamines during pregnancy. Most appear to be safe, but some may have adverse effects. The Centers for Disease Control and Prevention CDC urge people to ask a doctor before using an antihistamine or any other drug during pregnancy. Claritin and Zyrtec are popular over-the-counter antihistamines. Doctors consider them safe and effective treatments for minor allergies.
Both are second-generation antihistamines. These cause less drowsiness than first-generation antihistamines. No research has concluded that Zyrtec or Claritin is more effective, but some people report better responses with one or the other.
The slight differences between the two may make one drug more appropriate for some people. People can purchase Zyrtec, Claritin, and other popular brands without a prescription from supermarkets, pharmacies, and online stores.
Various treatments and strategies can help keep allergies at bay, including allergy shots. Theophylline Theo is a drug that some people with asthma and other lung problems take. In some instances when the two drugs were taken, it took longer for cetirizine to leave the body. However, the interaction may be dose-related.
It has only been reported with daily theophylline doses of mg or more. Cetirizine-D and brand-name versions, such as Zyrtec-D, are combination drugs. These drugs contain both cetirizine and the decongestant pseudoephedrine. Pseudoephedrine is a stimulant and can make certain health conditions worse. Your doctor may tell you that cetirizine-D is not for you if you have any of these conditions:. Cetirizine is an OTC drug that can relieve mild to moderate allergy symptoms.
Like any drug, especially OTC medication, you should understand all of the considerations before you start taking it. Talk to your doctor about any questions you have about your symptoms and any other conditions you may have. Your doctor may recommend a different antihistamine or a combination drug of cetirizine and another product that may require a prescription.
Learn more about the ways you can treat a stuffy nose, or nasal congestion, at home, including tips on decongestants, humidifiers, and steam remedies. Allegra Allergy and Claritin are over-the-counter allergy medications.
While they both treat allergy symptoms, they're not identical medications. Allergic rhinitis, or hay fever, is your body's response to specific allergens. It causes uncomfortable symptoms like sneezing and itchy eyes. Zyrtec and Claritin are similar over-the-counter allergy medicines. Your choice may come down to a subtle difference.
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