Visit Walgreens today for a great deal on children’s Benadryl! Today is the last day to use the Walgreens 20% off coupon! This coupon is valid only on regularly priced items. This month, buy two children’s Benadryl products and receive 3,000 Balance Rewards Points. Stack the 20% off coupon with a new printable coupon. The 20% Walgreens coupon will apply to the regular price before the manufacturer coupon applies.