New Allergen Block Products Launched by Prestige Brands Offer Unique, Drug-Free Way to Help Block Airborne Allergens. Prestige Brands Holdings, Inc. today announced the launch of Chloraseptic™ Allergen Block and Little Allergies™ Allergen Block products. These over-the-counter (OTC) products use an innovative scientific-based approach to help prevent nasal allergy symptoms by blocking allergens in the air on contact, before they enter the nasal passages. Allergen Block products, sold under the Chloraseptic™ brand for adults and the Little Remedies™ brand for children, are topical gels which are applied outside around the nostrils to block both indoor and outdoor allergens in the air on contact, thereby helping to prevent nasal allergy symptoms.