Prevalin allergy is a breakthrough hayfever treatment that acts 5x faster than hayfever tablets prevalin allergys unique formula gets to work in just 3 minutes making it effective right at the onset of symptoms relieves the main hayfever symptoms sneezing runny nose blocked nose itchywatery eyes prevalin allergy is effective for hayfever and for all year round allergies such as dust mite and pet allergies prevalin allergy is non drowsy and does not contain antihistamine or cor