Quick answer

Ask your pharmacist or doctor before combining. The lithium label says toxic blood levels begin at 1.5 mEq/L, close to the treatment range, and that salt and fluid balance can change them. It tells patients not to change the salt in their diet and to get extra salt and fluid for heavy sweating only under medical supervision.¹

Key facts

The lithium label lists dehydration, kidney problems, fever, and changes in sodium and potassium among the things that raise the risk of lithium toxicity.¹
The label says lithium can cause low blood sodium by decreasing how much sodium the kidneys take back.¹
The patient guide says changing the amount of salt in your diet could change the amount of lithium in your blood.¹
MedlinePlus tells people taking lithium to follow a diet with the right amounts of fluid and salt, and to tell their doctor about severe diarrhea, excessive sweating or fever.²
MedlinePlus lists sodium, potassium, chloride, magnesium, calcium, phosphate and bicarbonate as the main electrolytes.³

Ask your pharmacist or doctor first

Lithium levels depend on salt and fluid balance. The lithium label tells patients not to change the amount of salt in their diet, and says that if heavy sweating occurs, extra salt and fluid should be given only under medical supervision.¹

On the medicine's label

What does the lithium label say about salt and fluids?

The label's warning on low blood sodium says lithium can make the body lose sodium by cutting how much the kidneys take back. It says patients should keep a normal diet that includes salt, with an adequate fluid intake, at least while the dose is being settled. It adds that reduced tolerance to lithium has followed long spells of sweating or diarrhea, and that in those cases extra fluid and salt should be given under careful medical supervision, with lithium reduced or paused until the problem is resolved.¹

The patient guide says the same thing in plainer words: do not change the amount of salt in your diet, because that could change the amount of lithium in your blood.¹

Why do salt and water change lithium levels?

The label's list of things that raise the risk of lithium toxicity includes volume depletion or dehydration, a recent fever, impaired kidney function, and changes in electrolyte levels, especially sodium and potassium. It also says lithium can reduce the kidneys' ability to concentrate urine, with heavy urination and thirst, and that people with this need careful management to avoid dehydration, which leads to lithium being retained.¹

Put together, the label describes lithium levels as sensitive to shifts in sodium and water in either direction. The patient guide says drinking too much liquid can be as unsafe as not drinking enough. An electrolyte drink or powder changes how much sodium you take in, which is why the advice not to change your salt intake matters here.¹

What if you sweat a lot or have diarrhea on lithium?

People reach for electrolyte products after hard exercise, in heat or during a stomach bug, and those are the situations the label singles out. Its patient guide says to avoid becoming overheated or dehydrated during exercise and in hot weather, and to follow your healthcare provider's instructions about the type and amount of liquid to drink. If you have been sweating more than usual or have had diarrhea, it says you may need extra salt and more fluids and should talk to your provider.¹

MedlinePlus likewise lists severe diarrhea, excessive sweating and fever as reasons to tell your doctor while you take lithium.²

Which minerals in an electrolyte mix does the label mention?

Typical sports drinks hold about 230 to 690 mg of sodium per liter. One review advises against drinks above about 1,000 mg per liter because they become unpleasant to drink.⁴

The risk list in the lithium label names sodium and potassium. Magnesium and the other minerals that appear in drink mixes are not named there, and the sources checked do not address them. That is not a finding either way, so ask your pharmacist to read the whole Supplement Facts or Nutrition Facts panel with you, not just the sodium line.^1,3

What to ask your pharmacist about electrolytes and lithium

Does my electrolyte drink or powder add to the salt I take in, and does that matter with my lithium?
What is my plan for days of heavy sweating, fever or diarrhea, and who do I call?
Should my lithium blood level be checked after I start a new drink or salt product?
Are the amount and type of fluid I drink on a hot day right for me?

Take the label of anything you drink or stir into water. The lithium label names both sodium and potassium among the electrolyte changes that affect lithium risk, and both are printed on the panel.¹

Questions people ask

Can you take electrolytes with lithium?

Ask your pharmacist first. The lithium label asks patients not to change the amount of salt in their diet, and an electrolyte product can change it.¹

Can you drink electrolytes on lithium after a workout?

The patient guide says to avoid becoming overheated or dehydrated, to follow your provider's instructions about liquids, and to get extra salt and fluid for heavy sweating only under medical supervision. Ask your pharmacist what that means for you.¹

How does lithium affect electrolytes?

The label says lithium can lower blood sodium by reducing how much the kidneys take back, and can cause heavy urination and thirst. Changes in sodium and potassium also raise the risk of lithium toxicity.¹

What links electrolytes and lithium toxicity?

The label lists dehydration, kidney problems, fever, and changes in sodium and potassium among the things that raise the risk. The patient guide lists vomiting, diarrhea, drowsiness, weak muscles, blurred vision, clumsiness and ringing in the ears as symptoms of toxicity and says to call your healthcare provider right away if they appear.¹

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Sources

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.