Drinking alcohol while taking antiangina drugs may cause the same problems. Anyone who takes this medicine should limit the amount of alcohol consumed. Because these drugs may cause dizziness, be careful when driving, using machines, or doing anything else that could be dangerous. If the person is taking the form of nitroglycerin that is placed under the tongue and symptoms are not relieved within three doses taken about 5 minutes apart, the person should go to the hospital emergency room as soon as possible. A heart attack may be in progress.
Some people develop tolerance to antiangina drugs over time.
That is, the drug no longer produces the desired effects. Anyone who seems to be developing a tolerance to this medicine should check with his or her physician. Anyone who has had unusual reactions to antiangina drugs in the past should let his or her physician know before taking the drugs again. The physician should also be told about any allergies to foods, dyes, preservatives, or other substances. Women who are pregnant or breastfeeding or who may become pregnant should check with their physicians before using antiangina drugs.