Merck.com Promo Code & Coupon Code April 2025

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Promo codes, known as coupon codes or discount codes, help users to save money in many ways. Promo codes usually consist of numbers and letters that an online shopper can use when checking out on an e-commerce site to get a discount on their purchase. Retailers present promo codes to encourage you to buy more on websites and stores. In the US, the most common name for this type of offer is coupon code but they can also be referred to as discount codes, promotional codes, promo codes, e-coupons or coupon codes. Different brands and retailers tend to call them different things but they all do the same thing.