Educational information, not medical advice — ask your doctor or midwife.
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Natrum arsenicosum is a homeopathic remedy. It is made from sodium arsenate, a salt of arsenic. Homeopaths give it for hay fever, blocked sinuses and wheezy breathing.
The salt is watered down again and again, with hard shaking at each step. At the usual 30C strength, not one molecule of arsenic is left. You are taking a sugar pill, or a drop of water and alcohol.
Long use inside a tradition is not proof that something works. No trial shows this remedy beating a dummy pill. This page reports both sides: what homeopaths say, and what tests show.
Homeopaths follow the rule of "like cures like". A big dose of arsenic causes burning eyes, a streaming nose and tight breathing. So they give a tiny form of it to people with those same signs.
They also believe that shaking at each step leaves a trace of the salt in the water. Chemists have looked and found nothing. Once the arsenic is gone, there is no known way for the remedy to act on the body.
One thing is different at very low strengths, such as 1X or 3X. Real arsenic can still be there. That is a chemical dose with real risk, not a homeopathic idea.
Most people buy small sugar pills that have been soaked in the remedy. Liquid drops in water and alcohol are also sold.
Common strengths are 6C, 30C and 200C. Some shops also sell low strengths marked 1X, 3X or 6X.
Check the label before you buy. Low strengths may still hold arsenic. The higher C strengths hold none.
Sodium arsenate joined the homeopathic list in the 1800s. Its picture came from provings. In a proving, healthy people take a substance and write down every symptom they feel.
Homeopaths have used it since then for nose, sinus and chest complaints. It is a smaller remedy, not one of the famous ones. Its standing rests on old case notes rather than trials.
Some reactions to Natrum arsenicosum need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
Get emergency help straight away if you have vomiting, watery stools, bad stomach cramps, a garlic smell on the breath, or numb and tingling hands after taking a low strength product. These can be signs of arsenic poisoning.
Call for emergency help if breathing becomes hard, your lips or face swell, or your chest feels tight.
See a doctor within a few days if your nose or sinus pain lasts more than ten days, you run a fever, or your symptoms keep coming back. Also see a doctor before you use this remedy for a child, in pregnancy, or alongside prescribed drugs.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Natrum arsenicosum is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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