Let's take a minute to talk about your medication. 

This is nitroglycerin, and you should take it as prescribed by your doctor. 

It is a 'sublingual' tablet, so place it under your tongue until it dissolves. This may tingle or burn, which is normal. It should not be swallowed, chewed or crushed. 

Nitroglycerin tablets treat sudden chest pain. You should take it at the first sign of chest pain. You can repeat a dose every 5 minutes until you get relief. You should get help immediately if you need more than 3 tablets in 15 minutes. Also, get help right away if your chest pain feels different, or is more severe or frequent. 

This medicine will probably cause dizziness, so sit down when you take a dose and be careful when you stand. Also, it is common to get a headache. If you do, ask your doctor or pharmacist if it is best to treat the headache with aspirin or acetaminophen. If these or other side effects become reasons you want to stop taking this medicine, please talk to your doctor or pharmacist. 

To reduce side effects, you should avoid alcohol, and check with your doctor or pharmacist before taking any new medicine. Men should not take medicines for erectile dysfunction, because the combination can cause an unsafe drop in blood pressure. 

You should keep the tablets in the original container, tightly sealed, and at room temperature. 

For best results, carry it with you, and read the full 'Patient Information' leaflet.