Magnesium citrate is usually taken once as needed for constipation , not repeatedly throughout the day, and you should not use it for more than 1 week unless a clinician tells you to do so. It can also be taken in divided doses for magnesium deficiency, but that is a different use than its laxative form and should follow a doctor’s guidance.

How often to take it

For constipation, the common guidance is a single daily dose in a 24-hour period, with the exact amount depending on the product label and age. MedlinePlus says not to take it more often than prescribed and not to use it for longer than 1 week unless your doctor says otherwise.

For magnesium supplementation, some sources describe daily use in divided doses, but that is for magnesium deficiency or general supplementation rather than short-term constipation relief. A health professional should guide long- term use, especially if you have kidney disease, heart problems, or take other medicines that affect magnesium levels.

Practical cautions

Magnesium citrate can cause diarrhea, cramping, nausea, and dehydration if used too often or in too high a dose. It can also be risky if you have kidney problems, because your body may not clear magnesium normally.

Simple rule

  • For constipation: usually one dose , then wait and see.
  • Do not keep taking it day after day for constipation unless a clinician says it is okay.
  • If constipation keeps coming back, the better move is to ask about a safer long-term plan.

When to get medical advice

Get medical help if you have severe belly pain, vomiting, no bowel movement after using it, signs of dehydration, or symptoms of high magnesium such as weakness, dizziness, or an irregular heartbeat.

TL;DR: Magnesium citrate is generally not something you take many times a day for constipation ; it is usually used as a single dose , and you should avoid using it longer than 1 week unless your doctor says otherwise.