Educational information, not medical advice — ask your doctor or midwife.
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Mygale lasiodora is a homeopathic remedy. It is made from the black Cuban spider, a kind of tarantula. Its Latin name is Avicularia avicularia.
It is a single drug in homeopathy, so it is given on its own and not as part of a mixed formula. Homeopaths have used it most often for chorea (jerky movements a person cannot control). They have also used it for twitching, nerve pain and some skin problems.
The remedy is made by diluting the spider material again and again, with hard shaking at each step. At 30C, a common strength, no spider material is left at all. Trials have not shown that it works better than a placebo (a dummy pill), and long use in a tradition is not proof that something works.
There is no known way for this remedy to act on the body at normal strengths. At 30C the liquid or pill holds no spider material, so there is nothing left to have a drug effect.
Homeopaths work from an old idea called "like cures like". They say a substance that could cause twitching and restlessness in a healthy person can settle the same signs in a sick person. This idea has not been shown to be true in tests.
Most of what people notice is likely to be a placebo effect, the natural ups and downs of an illness, or care and attention from the person treating them.
You will usually see it as small sugar pills or tiny round pellets that melt under the tongue. Liquid drops are also sold, and these are normally preserved in alcohol.
Common strengths are 6C, 30C and 200C. The number tells you how many times the material was diluted and shaken.
Most pills are made with lactose (milk sugar) and sucrose (cane sugar).
The remedy came into homeopathic use in the 1800s, when homeopaths were testing many animal and insect sources. Spider remedies were linked in that tradition with restlessness and jerky movement.
It has always been a minor remedy. It is far less used than the better known spider remedy Tarentula hispanica, and it has no place in any tradition outside homeopathy.
See a doctor straight away if you or your child have jerky movements you cannot control, a fit, sudden weakness on one side, slurred speech, a stiff neck with fever, or a fast or uneven heartbeat.
Book an appointment soon if twitching lasts more than a few days, if nerve pain keeps you awake, if a skin sore will not heal, or if your symptoms come back after you stop the remedy.
Call for emergency help if breathing becomes hard, the face or throat swells, or a rash spreads fast after taking anything.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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