Educational information, not medical advice — ask your doctor or midwife.
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Mercurius dulcis is a homeopathic remedy made from calomel. Calomel is a white salt of mercury. Its Latin name is Hydrargyri chloridum mite.
The salt is watered down again and again. Each step is shaken hard. At 30C, none of the starting salt is left, and the pills are then mostly sugar.
People take it for ear, mouth and throat complaints. Trials in people do not show it beats a dummy pill. Long use in a tradition is not proof that a remedy works, and we say that once here.
There is no known way for this remedy to act on the body. That is the plain answer.
Homeopaths follow a rule they call 'like cures like'. Calomel in real doses causes sore gums, drooling and loose stools. So they give it, watered down, to people with those same signs.
They also say that shaking leaves an imprint in the water. No test has shown such an imprint. At 30C there is no mercury left to act at all.
So any change you feel is most likely placebo. Placebo means you feel better because you took something, not because of the drug itself.
You will most often see small sugar pills, called pillules. Tablets and liquid drops are also sold.
Common strengths are 6C, 12C and 30C. These hold no mercury.
Some makers sell low strengths such as 1X, 3X or 6X. These may hold real mercury. Always read the strength on the label before you buy.
Calomel was a mainstream drug in the 1700s and 1800s. Doctors gave it to empty the bowels, and for fevers and syphilis. It poisoned many people.
Teething powders for babies once held calomel. They caused 'pink disease', a mercury poisoning with a red rash and pain. Babies died, and the powders were banned.
Homeopaths kept calomel as a watered-down remedy from the 1800s on. It is a known name in their books, but a minor one next to Mercurius solubilis.
Some reactions to Mercurius dulcis need urgent care. Call your local emergency number or go to an emergency department straight away — do not wait to see whether it passes.
See a doctor straight away if you get a metal taste, sore or bleeding gums, heavy drooling, or a red painful rash on the hands and feet. These can be signs of mercury poisoning.
Get urgent care for numbness, shaking hands, confusion, or passing much less urine than normal. Take the bottle with you so the doctor can see the strength.
Also see a doctor if an ear, throat or eye problem is worse after two days, or comes with a high fever, bad pain or trouble swallowing. A child with diarrhoea who is sleepy, dry-mouthed or not passing urine needs care the same day.
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 Mercurius dulcis 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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