Educational information, not medical advice — ask your doctor or midwife.
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Prunus spinosa is a single homeopathic remedy made from the blackthorn shrub, also called sloe. Homeopaths have used it mainly for sharp, shooting pain in the eye and for bladder trouble.
The remedy is serially diluted. That means the plant is diluted step by step, with hard shaking at each step. At the common 30C strength, none of the plant is left in the pellet or drop.
Trials have not shown that homeopathic remedies work better than a placebo (a dummy pill). Its standing comes from homeopathic custom, and long use is not proof that something works.
There is no accepted way for this remedy to act on the body, because at normal strengths no plant material is left.
Homeopathy rests on two old ideas. The first is "like cures like", so a plant that could cause a symptom is used to treat it. The second is that shaking during each dilution step leaves some effect behind in the water.
That second idea has no support in chemistry or physics. When people feel better after taking it, the likely reasons are placebo effect, normal healing over time, or other care they are getting.
Most products are sugar pellets that melt under the tongue, sold as 6C, 12C or 30C. Liquid drops in a water and alcohol base are also common.
Some pellets are made with lactose (milk sugar). Check the label if milk sugar upsets you.
Low strengths such as 1X, 2X or a mother tincture still contain real plant material. These are far less common and call for more care.
Blackthorn grows in hedgerows across Europe and western Asia. Folk use of the flowers as a mild laxative and of the sloe fruit in jams and gin goes back centuries.
Homeopaths added Prunus spinosa in the 1800s. Old remedy handbooks list it for stabbing eye pain and for a full, aching bladder.
It has always been a small remedy. It is used far less often than staples such as Arnica or Belladonna.
Get emergency help now if you have sudden eye pain with sight loss, a red painful eye with vomiting, or you cannot pass urine at all.
See a doctor within a day or two if you have burning when you pass urine, blood in your urine, fever with back pain, a new or severe headache, or pain that keeps getting worse.
Also see a doctor if a symptom has not settled after about a week, or if you get a rash, swelling of the face or lips, or trouble breathing after taking any remedy.
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 Prunus spinosa 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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