Low blood pressure is known as Hypotension. It occurs when blood pressure during and after each heartbeat is much lower than usual. This isn't good because the heart, brain, and other parts of the body do not get enough blood. Normal blood pressures fall in the range of 90/60 millimeters of mercury (mm Hg) to 130/80 mm Hg. A significant drop can be even as little as 20 mm Hg but it can cause problems for some people.
Low blood pressure is commonly caused by drugs such as alcohol, anti-anxiety medications, certain antidepressants, diuretics, heart medicines, such as those used to treat high blood pressure and coronary heart disease, medications used for surgery and painkillers.
Low blood pressure can usually be treated with success. If you have shown signs of low blood pressure, you may need treatment. Treatment depends on the cause of your low blood pressure. Severe hypotension caused by shock is a medical emergency. You may be given blood through a needle (IV), medicines to increase blood pressure and improve heart strength, and other medicines, such as antibiotics. For low blood pressure caused by medicines (orthostatic hypotension), your doctor may change the dose or change it to a totally different drug. Don't stop taking your medicine unless told by your doctor. Other treatments for orthostatic hypotension include increasing fluids to treat dehydration or wearing elastic hose to boost blood pressure in the lower part of the body.