What Is Loratadine Syrup?

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  • Written By: H. Lo
  • Edited By: Lauren Fritsky
  • Last Modified Date: 23 November 2019
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Loratadine syrup is a liquid antihistamine used to treat seasonal allergy symptoms such as runny nose, sneezing and watery eyes, in addition to itchiness associated with hives, and itchiness in the nose or throat. As an antihistamine, loratadine syrup blocks histamine, which is a substance that causes allergy symptoms to occur. The medication does have its limits though, and while it treats symptoms arising from hives, it does not prevent them from occurring. In addition, loratadine syrup does not treat serious allergy reactions, such as anaphylaxis. If anaphylaxis occurs, a doctor will prescribe epinephrine and it is important to remember that a person with anaphylaxis should not substitute an epinephrine injection with loratadine syrup.

Dosage varies depending on a person’s age and specific condition, as well as how well he responds to the medication once taken. To ensure the best possible treatment, it is important that a person follow the instructions given to him, meaning he should not take more medication than instructed and he should pay attention to any missed doses. If he misses a dose, he can take one to make up for it, unless it is too close to the time for the next scheduled dose. To ensure that he takes the proper dosage, he needs to use a special measuring spoon and not a regular household spoon, as they can be inaccurate.


Usually, loratadine syrup does not cause side effects. At the same time, it is rare, but possible, to have an allergic reaction to the medication. An allergic reaction might cause a variety of symptoms, including breathing difficulty, rash and severe dizziness. In addition, itching or swelling of the face, tongue and throat can indicate an allergic reaction as well. If a serious allergic reaction occurs, it is important to seek immediate medical attention.

After three days, loratadine syrup should improve allergy symptoms but if it does not appear to do so, or if hives do not go away after six weeks, it is time to speak with a doctor. A worsening condition also requires medical attention. Children younger than two years of age should not take loratadine syrup, as the effectiveness and safety of the medication for those in this age group is not yet known. In addition, women who are pregnant or breast-feeding should discuss loratadine syrup with their doctor before using the medication. Breast-feeding women should be aware that taking the medication will cause breast milk to contain the medication.


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