If your blood pressure has dropped and you’re feeling dizzy or faint, the fastest way to raise it is to lie down with your legs elevated, drink about two cups (480 mL) of water quickly, and eat something salty. Low blood pressure is generally defined as a reading below 90/60 mmHg, and even a drop of 20 mmHg from your normal level can cause noticeable symptoms. Most of the strategies below work within minutes, not hours.
Drink Water Quickly
Drinking about 16 ounces (480 mL) of water is one of the simplest and most effective ways to raise blood pressure in the short term. A study published in Circulation found that the blood pressure response begins within 5 minutes of drinking, peaks around 30 to 35 minutes later, and stays elevated for over an hour. The effect works partly by increasing blood volume and partly by triggering a nervous system reflex that tightens blood vessels.
Plain tap water works fine. You don’t need a special electrolyte drink for this purpose, though adding a pinch of salt can help if you’re also low on sodium.
Use Physical Counterpressure Maneuvers
If you feel a dizzy spell coming on while standing, certain muscle-tensing techniques can raise your blood pressure within seconds by squeezing blood from your limbs back toward your heart. These are well-studied in people prone to fainting.
- Leg crossing with tensing: Cross your legs at the ankles while standing and squeeze your thigh, buttock, and abdominal muscles simultaneously. Hold for as long as needed.
- Hand gripping: Squeeze a rubber ball or any firm object as hard as you can with your dominant hand. This creates a full-body tension that raises pressure.
- Arm tensing: Grip one hand with the other in front of your body and pull your arms apart while keeping them locked together, tensing both arms at once.
These maneuvers have been shown to abort fainting episodes in clinical trials. They’re most useful as an immediate response when you feel lightheaded, not as a long-term solution.
Eat Something Salty
Sodium pulls water into your bloodstream, which increases blood volume and raises pressure. If your blood pressure is acutely low, eating salty food can help. Practical options include a handful of salted nuts, a cup of broth or bouillon, olives, pickles, or a few crackers with cheese. The effect develops over roughly 30 to 60 minutes as your body absorbs the sodium.
For people who deal with chronically low blood pressure, a doctor may recommend a generally higher sodium diet, which is the opposite of the advice given to people with high blood pressure. This only applies if your readings consistently run low.
Change Your Body Position
Gravity plays a major role in blood pressure drops, especially when you stand up too quickly. If you’re feeling faint, the fastest thing you can do is get low.
Lie flat and elevate your legs above heart level. This sends pooled blood from your lower body back to your core, raising pressure almost immediately. If you can’t lie down, sit and put your head between your knees. When you’re ready to stand again, do it slowly: sit up first, pause for 10 to 15 seconds, then rise to your feet. This gives your body time to adjust.
Wear Compression Garments
If low blood pressure is a recurring problem, compression stockings or an abdominal binder can prevent blood from pooling in your legs and abdomen when you stand. The mechanism is straightforward: external pressure on the veins in your lower body pushes blood back into central circulation, improving the volume of blood your heart pumps with each beat. Research in the Journal of the American Heart Association found that abdominal compression in particular improves systolic blood pressure by increasing both the blood returning to the heart and the resistance in blood vessels.
Waist-high compression stockings tend to work better than knee-high ones for this purpose, since a large share of blood pools in the abdominal area, not just the calves.
Caffeine as a Short-Term Boost
Caffeine constricts blood vessels and can raise blood pressure temporarily. A cup of coffee or strong tea before getting up and moving around can help, particularly in the morning when blood pressure tends to be lowest. The Cleveland Clinic specifically recommends a caffeinated drink before breakfast or lunch for people whose blood pressure drops after meals, a condition called postprandial hypotension.
The effect is temporary and diminishes if you drink caffeine regularly, so this works best as an occasional strategy rather than a daily fix.
Preventing Drops After Meals
Blood pressure commonly falls after eating because your body diverts blood to the digestive system. Large, carbohydrate-heavy meals cause the biggest drops. To prevent this:
- Eat six smaller meals instead of three large ones
- Keep meals low in refined carbohydrates
- Drink 12 to 16 ounces of water about 15 minutes before eating
These strategies reduce the demand your digestive system places on your circulation and keep your blood pressure more stable throughout the day.
What Prescription Medications Do
If lifestyle measures aren’t enough, doctors can prescribe medications that raise blood pressure. It’s worth knowing, though, that these are not fast-acting in the way water or body positioning are. One commonly prescribed option works by helping your kidneys retain sodium, but its full blood pressure effect takes one to two weeks to develop because the sodium retention builds gradually. Another option works faster by directly tightening blood vessels, but still takes time to titrate to the right dose. For acute episodes, the physical strategies above will always be faster than a pill.
When Low Blood Pressure Is Dangerous
Most episodes of low blood pressure are uncomfortable but not harmful. However, extreme drops can lead to shock, which is a medical emergency. Warning signs include confusion, cold and clammy skin, rapid shallow breathing, a weak and fast pulse, and bluish discoloration of the skin. If someone shows these signs, call emergency services immediately. Laying them flat with legs raised is the right first aid while waiting for help.
Recurrent episodes of dizziness or fainting, even without shock, deserve medical evaluation. Low blood pressure can be caused by dehydration, blood loss, heart problems, infections, or medication side effects, and the right long-term treatment depends on identifying the underlying cause.