Nitroderm TTS 10mg Transdermal Patch is a patch that you stick on your skin. It used to treat and prevent heart-related chest pain (angina). The patch contains the medicine which is released from the patch and absorbed through the skin and into the blood vessels, so blood can flow more easily to the heart. Nitroderm TTS 10mg Transdermal Patch should be taken in the dose and duration as advised by your doctor. Follow the instructions given by your doctor before using it carefully. Read the leaflet which comes with the medicine carefully to make sure you are getting it right. You can develop tolerance to this medicine over time, which means that the same dose becomes less effective. You have to stick to a really specific dosing schedule to prevent this from happening. The most common side effect of this medicine is nausea, vomiting, and headache. There are other, rarer side effects, some of them serious. Ask your doctor and read the leaflet which comes with the medicine to make sure you are keeping safe. Do not use Nitroderm TTS 10mg Transdermal Patch if you are taking medicines to treat high blood pressure in your lungs (pulmonary hypertension), or erectile dysfunction; or if you have anemia or glaucoma (increased pressure inside the eye). Always tell your doctor what other health conditions you have and what other medicines you are taking. It is best not to drink alcohol with this medicine as it increases some of the side effects. If you are affected by dizziness, avoid driving. If you are pregnant, thinking about becoming pregnant, or breastfeeding, ask your doctor before taking this medicine.