Allergy Relief Tablets, 300 ct QC99918 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Compare to the Active Ingredient in Benadryl Temporary relief from symptoms due to hay fever or other respiratory allergies. Relief from sneezing, itchy, watery eyes, runny nose, and itchy throat. Year-round relief for indoor and outdoor allergies.