People who have frequent attacks may require longer lasting preparations. These help prevent attacks from occurring. One problem with these preparations is that your body may develop tolerance as you use it for a while. They also are more likely to cause side effects such as headache and dizziness. It is also important to use fresh medications.
Nitrates lose their effectiveness very quickly.
Store them in a dark, tightly closed bottle. Beta-adrenergic blockers lower blood pressure and reduces the cardiac oxygen consumption. They work by inhibiting the transmission of nerve signals to the heart. This slows the heart and hence the heart consumes less oxygen. Usually beta blockers are given to reduce the heart rate and is effective in combination with nitrates or alone.