Nitroglycerin is for people with angina, angina is almost a squeezing like chest pain that occurs when a part of your heart doesn't receive enough blood flow. Nitroglycerin is a Vasodilator it works by soothing and relaxing blood vessels so it's easier for blood to reach your heart, relieving some work your heart has to do.. furthermore relieving the chest pain..
if you do not have chest pain and take this medicine you can expect an abnormally fast heart rate in general. This can cause panic, weakness, dizziness, and flushing almost as if your heart was beating from working out, minus the working out part.
If you're overdosing on nitroglycerin and intake a dangerous amount you can expect headaches, confusion, blurry and/or double vision, vomiting, short or shallow breathing and cold or sweaty skin...
If you do not have angina or were directed by a medical professional to take nitroglycerin I suggest not taking it at all, any medicine can be dangerous without reason. If you have already taken some and are feeling anything abnormal please tell someone or seek help if needed.
Well because your heart beat is increasing very rapidly your hearts output will speed up or increase. This happens because the heart is beating faster forcing it to pump blood threw you at a more efficient or higher rate. This increased flow of blood is very important for your lungs because with an increased heart rate comes increased breaths meaning your lungs are relying on that blood flow to be able to release oxygen into your fast flowing blood stream. Which that oxygenated blood will then fuel the rest of your body. Sorry if this is kinda a mess but pretty much the main idea is your body needs an more blood flow per minute because it allows the rest of your body to function as fast and efficiently as your heart.
