Dust mite drops are a specific immunotherapeutic class of medication that results in the production of specific blocking antibodies and immune tolerance in patients who are allergic to dust mites, which results in a decrease in allergic reactions to dust mites. Dust mite drops need to be kept shaded, airtight, and in a cool place (no more than 20°C). High outdoor temperatures in summer can affect the medicinal properties of dust mite drops and therefore they should not be used.