Why does Viagra cause heartburn?

To keep our food from coming back from the stomach to our mouth, the

esophagus has two sphincter muscles; the one at the top is called the upper

esophageal sphincter; the one at the bottom is the lower esophageal

sphincter. Apparently the chemical in Viagra that causes the soft tissue

muscles in your penis to relax, and allow more blood flow to the area , can also cause the sphincter muscles to relax , most likely the heartburn you experince in relation to a dose of Viagra is a result of relaxation the Lower Esophagel Sphincter (LES) , resulting in acid reflux ( ie it litteraly spashes up out you stomach a tiny bit and causes a burning feeling ) . You might try various antacids, and if it is chronic , and mostly assocaited with times w hen you take the Viagra judt get your doctor to add in a percription antiacd when he does your next script ..