Antihistamine Dosage

Antihistamine has been used by people of all ages with differing rates of success. Some people report taking antihistamines daily and they help alleviate the symptoms of allergies, while others take them only occasionally during periods of nasal allergy or cold symptoms. However they are used, it is good to understand the standard dosage of antihistamines.

Antihistamine and Drowsiness

Some antihistamines cause drowsiness and should only be taken by those who will not be operating machinery or driving a vehicle. Drowsiness can cause an accident and injuries to oneself and others. While this is true with some over the counter medications that contain antihistamine, there are others that can be used that do not cause this reaction. Locating an antihistamine that is both beneficial for relief of allergy symptoms and do not cause drowsiness just takes a bit of investigation on the part of the user.

Standard Antihistamine Dosage

The standard dose of any antihistamine will always depend on the age and size of the person who is going to be taking this medication. For instance, Cetirizine (Zyrtec) recommends that children 6 years and older take 5-10 mg once daily, but that will depend on the severity of the symptoms. The elderly, however, are told to take this antihistamine with a dosage level of 5 mg daily which can be increased to 10 mg daily if needed.

Desloratadine (Clarinex), a well known antihistamine used for seasonal and perennial allergic rhinitis, recommends a dosage in 6-11 months olds of 1 mg daily, and that increases to 1.25 mg once daily for 12 months to 5 years. 6-11 years standard dosage of this antihistamine increases to 2.5 mg once daily, and for 12 years and older, the dose increases to 5 mg.

Cautions When Taking an Antihistamine

Many antihistamines carry cautions for people suffering from certain conditions such as renal/hepatic impairment. Since antihistamines are used to prevent the constant flow of mucous fluids, and therefore affect other bodily fluids, use in these patients can cause complications.

Variations in Antihistamine Dosage

As has been established thus far, there is no one size fits all standard dosage for an antihistamine. The dosage will always depend on the product, as well as the age and size of the individual who is going to be ingesting the antihistamine. Since some antihistamines can be taken by both adults as well as children; it just makes good sense to consult with a physician prior to taking any antihistamine. This is especially true if there are other health related conditions.

For the person who is taking other medications on a regular basis, consulting with a physician is necessary to find out if there are any possible side effects related to combining those medications with an antihistamine. For instance, some medications like those taken for hypertension may cause the antihistamine to have a paradoxical effect. That means that rather than becoming drowsy, the individual may not be able to sleep at all.

Understand Your Antihistamine and the Possible Reactions

Understanding the interactions of other medications with antihistamines and their proper doses helps to prevent undue problems that could occur.