What is the primary indication for Frank's antihistamine prescription?

The primary indication for Frank's antihistamine prescription is severe seasonal allergies. Antihistamines are specifically designed to alleviate symptoms associated with allergic reactions, which often peak during certain seasons when pollen and other allergens are prevalent. These medications work by blocking the action of histamine, a chemical released during allergic reactions that can lead to symptoms such as sneezing, itching, runny nose, and watery eyes. Therefore, in the context of severe seasonal allergies, an antihistamine provides essential relief to individuals affected by these symptoms, making it the most appropriate choice for this indication.