Avoid Risks
Allegra may
Within an hour, all patients should notice a reduction in their allergy symptoms with peak effects seen in two to three hours
64% of reviewers reported a positive effect, while 19% reported a negative effect
The authors add that first-generation antihistamines, such as diphenhydramine, chlorpheniramine, or hydroxyzine, can be associated with substantial and sometimes fatal side effects
Allegra (fexofenadine) is a second-generation antihistamine, meaning it doesn't cross the blood-brain barrier as readily as first-generation Allegra (fexofenadine), Claritin (loratadine), and Zyrtec (cetirizine) are over-the-counter (OTC) antihistamines used to treat allergies
Children's Allegra Allergy 12-Hour liquid is available over the counter
But they don't treat acute asthma symptoms and should never be taken for an asthma attack
Side effects are generally mild with second-generation antihistamines and include a headache and rarely dry mouth, and nausea
Diphenhydramine is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease
Only diphenhydramine citrate and diphenhydramine hydrochloride are used commercially
Antihistamines work by blocking the effects of a chemical called histamine that is responsible for many allergic symptoms such as congestion, runny nose, sneezing, itchy throat, hives, skin rashes, itching, and itchy or watery eyes
Of the 6 studies on healthy subjects, 1 compared with the first-generation antihistamines [], 5 compared with the second-generation antihistamines [25
Sedation is a common side more
Side effects of taking first-generation antihistamines can include: Daytime drowsiness
Cetirizine has an average rating of 5
Benadryl, also known by its generic name diphenhydramine, is known as a first-generation antihistamine
All of these antihistamines are indicated for adults and children 2 years old and older, with Zyrtec and Claritin dosed once a day for people of all ages