Zantac Maximum Strenth is a fast working tablet that helps not only prevent but relieves heartburn. Symptoms of heartburn can be shoulder pain, shortness of breath, chest pain, sweating, etc. You should always see a doctor if these symptoms continue for long periods of time. When I went out to eat at a spicy Mexican food restaurant I knew it was going to end badly so I took a Zantac with me just in case. Now directions on taking the medicine depend on if you are taking for heart burn or to prevent heart burn. If you already have heartburn you will want to swallow one tablet with a eight ounce glass of water. If you are trying to prevent getting heart you will want to take one tablet with a glass of water thirty to sixty minuets before eating or drinking food that may cause you to have the heartburn. I had already had the heartburn so I took the tablet hoping it would work fast. Much to my surprise the achiness in my chest started to ease just after twenty minuets. After taking this tablet I was able to enjoy all different types of food and didn't have to worry about the after effects.