Certain groups of people—the elderly, African Americans, and those with a family history of high blood pressure—are more likely than others to have blood pressure that's particularly salt-sensitive. But because there's no way to tell whether any one individual is at risk, everyone should consume less sodium, says Eva Obarzanek, PhD, a research nutritionist at the National Heart, Lung, and Blood Institute.
A little tomato on your menu could be the key to healthier blood pressure. In addition to boasting plenty of vitamin C and quercetin, tomatoes are a great source of lycopene, which researchers at Ben-Gurion University in Israel have linked to significant reductions in blood pressure. Just don’t try to get your fix from ketchup or bottled tomato sauce; the combination of sugar and salt in most recipes can send your blood sugar through the roof.
For example, in a hypertensive patient with asthma, it may be inadvisable to prescribe a beta blocker, as these drugs can aggravate that respiratory condition. Similarly, in patients prone to constipation (the elderly, for example) use of certain calcium channel blockers might best be avoided -- along with diuretics -- as both these classes of drugs can inhibit proper bowel function.
Clonidine (Catapres, Catpres-TTS) is an inhibitor of the nervous system in the brain. These inhibitors of the nervous system act by binding to receptors on nerves in the brain to reduce the transmission of messages from the nerves in the brain to nerves in other areas of the body. By inhibiting transmission to nerves outside of the brain that innervate muscle cells of the heart and blood vessels, heart rate and blood pressure are reduced.

Don’t get too excited. Turns out that dark chocolate (at least 50% to 70% cocoa) can give you a boost of a plant compound called flavanol. As with garlic, this antioxidant can raise your nitric oxide levels and widen blood vessels. That can make your blood pressure drop a notch. It goes without saying that a little bit of chocolate is all you need.