We originally ran this post for a free sample of Prilosec OTC earlier in May. We just want to remind you that this free sample offer is still available for a limited time. What does heartburn feel like? If you know that answer then you need to try Prilosec OTC. With just one Prilosec OTC pill a day, you can block frequent heartburn before it begins for a full 24 hours with zero heartburn. So you can get through the day – and rest at night – without the worry of heartburn flare-ups on your mind. Free Prilosec OTC sample offer expires July 1, 2015.