Educational information, not medical advice — ask your doctor or midwife.
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Arsenicum sulphuratum rubrum is a homeopathic remedy. It is made from realgar, a red rock that holds arsenic and sulphur. Its Latin name is Arsenici disulphidum, and it is also called red arsenic sulphide.
It is a single drug. That means it is made from one starting material, not a blend of several. Homeopaths reach for it for itchy skin, hay fever, headaches and low mood.
The rock is ground, mixed with liquid, then watered down again and again with shaking at each step. At 30C, not one atom of the rock is left in the product. Long use in a tradition is not proof that a thing works, and trials do not show this remedy beating a dummy pill.
The honest answer: no one has shown that it works, and there is no known way it could work.
Homeopathy rests on two ideas. The first is "like cures like". A thing that causes certain signs in a well person is said to treat those same signs in a sick person.
The second idea is that watering a substance down makes it act more strongly. That idea does not match what chemists know about matter.
By 30C, a pellet is sugar and water with no source rock in it. So there is no way for it to act on your body. Trials of homeopathy as a whole have not beaten dummy pills.
Sugar pellets are the most common form. You let them melt under the tongue. Liquid drops in water and alcohol are also sold, and so are small tablets.
Strengths are marked with a number and a letter, such as 6C, 30C or 200C. The higher the number, the more times it was watered down. 30C is the usual shop strength.
You may also see 3X or 6X. These are watered down far fewer times. Do not buy these, and never buy raw realgar powder.
Realgar is an old and well known mineral. People used it as a red paint and as a poison for rats and insects.
Healers in China used it in tiny amounts, and it appears in old Indian texts as well. Those uses belong to the raw rock, not to the watered-down remedy.
Homeopaths took it up in the 1800s. They gave it to healthy people, wrote down what those people felt, and built the remedy picture from those notes. It stayed a minor remedy, used far less than its better known cousin Arsenicum album.
See a doctor if your symptoms get worse, or if nothing has changed after about a week.
Go to an emergency department straight away if you have vomiting, bad belly pain, watery stools, or numb and tingling hands after taking a low potency or raw realgar. These can be signs of arsenic poisoning. Take the packet with you.
Get urgent help for trouble breathing, swelling of the face or throat, chest pain, or a rash that spreads fast.
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 Arsenicum sulphuratum rubrum 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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