Isosorbide mononitrate is used to prevent chest pain in patients with a heart condition known as angina. This medication is normally taken twice a day. The first dose should be taken in the morning and second dose should be taken 7 hours later. This medication works by dilating blood vessels throughout the body. This can cause dizziness and lightheadedness when standing quickly and during the first days of therapy. This medication can cause headache - which also indicates the drug is working. These headaches are relieved with aspirin or acetaminophen. For this drug to be most effective it should be taken as prescribed, separating doses by 7 hours. Missed doses should not be doubled up.

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