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There are many different types of blood pressure medications, and it's important that you understand what's been prescribed for you before you begin taking them.  Some have serious side effects that you need to inform your doctor about, and others will cause drug interaction or allergic reactions if you do not communicate these things to your doctor as well.  Most blood pressure medications work to slow your heartbeat, lessen the constriction of blood vessels, or cause your blood to become thinner.