Stomach aches can be treated by over the counter medications like Pepto Bismol, Alka-seltz, Tums, and other type OTC's. Convenience stores are the number 1 place people stop to get medicine when they need quick relief. Having a good variety of over the counter medicines on hand is a good idea for stores. Customer often come by to get one items and buy others. If a customer knows your store supply what they need you will be the first to come to mind. OTC Medicines are cheap to purchase wholesale but could put you in the mind of your customers when they need quick relief and do not want to go to large stores. Especially when they have a stomach aches.