Which over-the-counter medication is frequently used for self-medication of allergies?

Diphenhydramine, commonly known by the brand name Benadryl, is an antihistamine that is widely recognized for its effectiveness in treating allergic reactions. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms such as itching, sneezing, runny nose, and hives.

In addition to its use for allergies, diphenhydramine is also often used as a mild sleep aid due to its sedative properties, which makes it a popular choice for individuals seeking relief from both allergy symptoms and occasional insomnia. While this sedative effect can be advantageous for some, it can also be a disadvantage, especially for individuals who need to remain alert throughout the day.

The other options listed, such as loratadine, fexofenadine, and cetirizine, are also antihistamines used to treat allergy symptoms but are generally preferred for daytime use due to their non-sedating properties. They may not produce the same level of drowsiness as diphenhydramine, making them a better fit for individuals who need to stay alert while managing their allergies. Therefore, while diphenhydramine is effective for allergy relief and often used for self-medication, it