Educational information, not medical advice — ask your doctor or midwife.
Tarentula hispanica is a homeopathic single remedy. It is made from the Spanish wolf spider, Lycosa tarantula. The whole spider is crushed, then diluted again and again, with shaking at each step.
Homeopaths have long given it to people who feel very restless. The picture is someone fidgety, hurried, or driven to move.
Here is the evidence verdict up front. There are no human trials of Tarentula hispanica for any health problem. Trials of homeopathy as a whole have not shown it works better than placebo (a dummy treatment).
Its standing rests on homeopathic tradition, not on proof of effect. Long use tells you what people have done for many years. It does not tell you that the remedy works.
The dilution matters. At 30C, the strength most often sold, almost none of the original spider is left in the pellets you take.
That is why the remedy is mostly harmless. It is also why there is no likely way for it to act like a drug.
There is no accepted way that Tarentula hispanica could work. There is also no measured effect on the body to explain.
Homeopathy rests on two ideas from the 1790s. The first is "like cures like". A substance that causes symptoms in a well person is said to treat those same symptoms in a sick one.
The second idea is about dilution. Diluting a remedy over and over, with hard shaking, is said to make it stronger, not weaker.
Neither idea fits what chemistry and biology have since shown. Past about 12C, no molecules of the source are likely to be left. Claims that water holds a "memory" of the spider have failed in testing.
People do report feeling better after a homeopathic visit. That report is real, but it has a simple cause.
The long, kind interview, the hope of help, and the way many symptoms settle on their own all play a part. These are placebo and time effects, not drug effects. That is the honest reading of the evidence as it stands.
Tarentula hispanica is sold in the usual homeopathic forms:
- Sugar pellets or pillules, most often labelled 6C, 12C, 30C or 200C - Liquid drops in a water-and-alcohol base - Tablets that melt under the tongue - Sometimes a low-potency or mother tincture, which is a practitioner product, not a shop product
The C on the label means each step diluted the mix one part in a hundred. 30C means this was done thirty times over.
The remedy came into homeopathy in the mid-1800s. A Spanish doctor, Joaquin Nunez, ran a "proving" in Spain. Healthy people took the preparation and wrote down the symptoms they noticed.
The proving painted a picture of a restless person. They cannot keep still, and they feel hurried and impatient. Music and rhythm soothe them.
That picture was tied to old folk tales of tarantism in southern Italy and Spain. People bitten by spiders were said to dance the tarantella until the effect passed.
The remedy has stayed in homeopathic materia medica ever since. It is still taught in homeopathic schools today. Outside homeopathy it has no traditional or medical use.
See a doctor promptly if you have restlessness that is new, severe, or comes with a fast heartbeat, sweating, fever or confusion. Get urgent help for jerky movements you cannot control, sudden weakness, trouble speaking, chest pain or fainting. Call emergency services right away if you have thoughts of harming yourself. And book an appointment if your symptoms have not settled within two weeks, or if you find yourself using this remedy instead of treatment your doctor has recommended.
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 Tarentula hispanica 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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