Fluids and Salt for POTS: What the Trials Show

Extra fluid and salt form the first line of POTS treatment in nearly every guideline. The proof behind them is thinner than the habit suggests.

What the trials show

• Garland 2021 compared 6 days of very high sodium (300 mEq per day) with very low sodium (10 mEq) on a tightly controlled diet. It tested extreme diets and did not measure symptoms.
• Medow 2019 measured a short-term, physiologic effect one hour after a single dose.
• Snapper and Cheshire 2022 concluded that oral salt and water are the mainstay of treatment, while the published evidence of benefit is relatively weak and no randomized trial of oral or IV hydration for POTS existed at the time.

A Calgary trial of salt in POTS (NCT05924646) is recruiting and may give clearer answers.

Who should check first

Ask your doctor before raising sodium if you have high blood pressure, kidney disease, heart failure, or are pregnant. Salt tablets can irritate the stomach, and some people do better getting extra sodium from food and electrolyte drinks.

A practical way to try it

1. Drink water steadily through the day, and front-load before getting up (a common suggestion is about 500 mL).
2. Add salty foods and broth before adding tablets.
3. Use electrolyte mixes if plain water leaves you bloated or still dizzy.
4. Run a stand test under similar conditions over 2 to 4 weeks and bring the log to your next visit.

Gear

Oral rehydration mixes and a validated blood pressure cuff are on the resources page, with affiliate links we disclose there. Check with your doctor before adding sodium.