![]() It then triggers allergy symptoms, like a runny nose or itchy eyes. Histamine is a chemical our immune system releases when we come into contact with something we’re allergic to. These include over-the-counter (OTC) allergy medicines like: If your allergies only appear sporadically - say when the pollen count is high or you have that random encounter with your friend’s cat - oral antihistamines may be your best bet. Here are the three most common kinds of allergy medicines people use. What are the best allergy medicines to take?ĭepending on how long these symptoms last, certain allergy medicines may work better than others. While allergy symptoms may vary from person to person, the most common ones include: This is caused by environmental allergens, including:Ĭertain foods that you might be allergic to can also trigger an immune response - but they rarely lead to perennial allergies. Causes of AllergiesĪllergic rhinitis, more popularly known as hay fever, refers to symptoms that affect the nose. On the flip side, fall allergy season usually lasts from August to October, with mid-September being the roughest time. you live, spring allergy season can start as early as February and last into the beginning of summer. Seasonal allergies tend to be most troublesome in the spring and fall. People with seasonal allergies usually refer to the times when they experience symptoms as “allergy season.” For others, they can be year-round - called perennial allergies. For some people, allergy symptoms only appear at certain times of the year but may last for a few months - called seasonal allergies. Journal of Pharmaceutical Sciences, 124, 160–168 .View more medications How long do allergy symptoms last?Īllergy symptoms can last anywhere from a few hours to several months depending on what’s causing them and how they’re treated. Molecular determinants responsible for sedative and non-sedative properties of histamine h1-receptor antagonists. Uesawa, Y., Hishinuma, S., & Shoji, M.Cetirizine, loratadine, or placebo in subjects with seasonal allergic rhinitis: Effects after controlled ragweed pollen challenge in an environmental exposure unit. Comparative onset of action and symptom relief with cetirizine, loratadine, or placebo in an environmental exposure unit in subjects with seasonal allergic rhinitis: Confirmation of a test system. H., Briscoe, M., Rafeiro, E., Chapman, D., & Kramer, B. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. And always check the package for dosing guidelines. For the best results, talk to your child’s doctor or a pharmacist before deciding what dose to give your child. Remember that children may be different sizes at different ages, so when in doubt, start with a smaller dose. For the best possible results, check with your doctor or pharmacist before deciding what dose to use. Older adults and adults who have chronic illness should only take 5 mg of Zyrtec per day. People with chronic medical conditions like kidney disease may need less frequent doses because the drug may take longer for them to process. Children this age using Zyrtec should be given 2.5–5 mg. The typical daily dose of Claritin for children aged 2–5 years is 5 mg. The typical daily dose of Claritin for adults and children who are 6 years and older is 10 mg per day. The dosage depends on your age and the severity of your symptoms.Ĭlaritin is active in the body for at least 24 hours. However, if you give your children a dose of either drug that’s too large, they can become groggy.Ĭlaritin and Zyrtec both come in the same forms: Children may become stimulated, restless, or sleepless. swelling in the lips, tongue, face, or throatĬhildren may have any of the side effects that adults do, but they can also have completely different reactions to antihistamines.If you have one of the following side effects after taking either medication, seek emergency medical attention: More serious side effects of these medications are rare. Mild side effects caused by both medications include: Claritin is less likely to cause sleepiness than Zyrtec when you take either at recommended doses. Take it for the first time when you will be at home for a few hours in case it makes you sleepy. Zyrtec can cause sleepiness, but only in some people. However, some side effects may still occur. Zyrtec and Claritin have very few side effects and are generally recognized as safe for most people.
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