Electrolyte management on GLP-1 — September 2026

wei_SG said:

I spent a month blaming the drug for headaches and light-headedness that turned out to be salt and water, which is embarrassing and apparently common.

Electrolyte monitoring on hydration — especially important during early titration when GI effects are most pronounced:

• Sodium: 140 mEq/L (normal, but was low at week 2 from vomiting)
• Potassium: 4.0 mEq/L (supplement if below 3.5)
• Magnesium: 2.0 mg/dL (supplementing with glycinate)
• Phosphorus: 3.6 mg/dL (normal)

Low electrolytes cause muscle cramps, heart palpitations, and fatigue — symptoms often blamed on the medication itself. Check your levels before assuming it's a drug side effect.

pete_manc_UK said:

Electrolyte monitoring on hydration — especially important during early titration when GI effects are most pronounced: Sodium: 140 mEq/L (normal, but…

Muscle cramps on hydration — anyone else? I was getting severe leg cramps at night, especially calves. Bloodwork showed my potassium was low.

GLP-1 agonists can cause electrolyte shifts due to reduced food intake and GI effects. Get your electrolytes checked and supplement accordingly. I take magnesium glycinate 400mg + potassium gluconate 99mg daily and cramps are gone.

wei_SG said:

I spent a month blaming the drug for headaches and light-headedness that turned out to be salt and water, which is embarrassing and apparently common.

This is my experience too, for whatever a second data point is worth.

From the other side of the consultation, briefly.

Helpful anti-nausea foods for hydration users:

• Ginger (tea, chews, supplements — all work)
• Peppermint (tea or oil capsules)
• Plain crackers or rice cakes
• Bananas (easy to digest, replenish potassium)
• Clear broth (hydration + sodium)
• Small amounts of protein (chicken breast, plain Greek yogurt)

Avoid: greasy foods, spicy foods, large meals, lying down after eating. Keep meals small and frequent — I do 5-6 mini meals/day.