Our Vicks ZzzQuil products have been carefully crafted to give you the best sleep possible. Unlike the Diphenhydramine HCL used to decrease symptoms of allergies, the only purpose of our Diphenhydramine HCL formula is for better sleep. Just like we don’t recommend using ZzzQuil to treat symptoms of allergies, we recommend that you do not use allergy medications for anything other than treating allergies, as it increases the risk of side effects and decreases the chance of successful results.