Advertisement

How do antihistamines work?

Antihistamines -- available as tablets, nasal sprays, and eye drops -- help relieve allergy symptoms by blocking the effects of histamine, a substance released by your body when you're exposed to an irritant. Antihistamines help reduce itching, sneezing, runny nose, and itchy, watery eyes. For congestion relief, antihistamine nasal sprays are more effective than tablets.

Second-generation antihistamines (such as loratadine and fexofenadine) are recommended over first-generation for treating seasonal allergies. These newer drugs have fewer side effects and are low-sedating or nonsedating, so they don't cause as much drowsiness as their older counterparts.

Continue Learning about Nasal Agent

What is an antihistamine?
Jumo HealthJumo Health
Antihistamines are medicines that treat mild allergic reactions. Antihistamines come in tablets and ...
More Answers
What are the side effects of chronic nasal spray use?
Lawrence T. Chiaramonte, MDLawrence T. Chiaramonte, MD
Someone whose nose is constantly clogged because of allergic rhinitis will snort nasal sprays like N...
More Answers
What is cromolyn nasal spray?
Donna Hill Howes, RNDonna Hill Howes, RN
Cromolyn nasal spray (NasalCrom) reduces allergy symptoms by preventing cells in the air passages fr...
More Answers
What are side effects of antihistamine nasal sprays?
Donna Hill Howes, RNDonna Hill Howes, RN
Side effects may include headaches, a sensation of burning in the nose, nosebleeds, sneezing, a bitt...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.