Belladonna: The Deadly Nightshade Behind Renaissance Eyes

The plant is called Atropa belladonna, and the second half of that name is the giveaway. Belladonna is Italian for beautiful woman. Carl Linnaeus chose it in the eighteenth century as a nod to a cosmetic habit that was already centuries old by then: women squeezing juice from the berries of deadly nightshade into their eyes to make their pupils swell.

It worked. That is the uncomfortable part. The look it produced was real, the chemistry behind it is sound, and a version of the same compound sits in ophthalmologists’ offices today. The cost was the catch.

A look built on dilation

Wide, dark, doe-like eyes were a prized ideal in Renaissance Venice and across sixteenth-century Italy. A large pupil reads, even now, as openness and attraction; the eye does it involuntarily when we look at something we want. Venetian women found a shortcut. According to the Royal College of Physicians of Edinburgh’s botanical history of the plant, they used drops prepared from the berry’s juice to force that dilation on command.

The effect was striking up close. Pupils blown wide leave only a thin ring of iris, which gives the eye a liquid, slightly otherworldly darkness. Paired with the pale complexions fashionable at the time, it created exactly the soft, yielding gaze that portraits of the era keep returning to. If you want to see the modern descendant of that ideal, the doe eye tutorial builds the same wide, rounded openness with shadow and liner rather than poison.

What atropine actually does

The active compound is atropine, with a smaller contribution from a related molecule called hyoscyamine. Atropine is an anticholinergic, which means it blocks the action of acetylcholine, one of the body’s signaling chemicals. ScienceDirect’s pharmacology overview describes it as a muscarinic antagonist, and that mechanism is the whole story of the cosmetic effect.

Here is the chain. The iris has a small circular muscle, the sphincter pupillae, that contracts the pupil in response to acetylcholine. Block that signal and the muscle cannot contract, so the pupil stays open. Atropine does this efficiently, which is why a single application could keep the eyes dilated for hours.

The same block hits a second muscle, the ciliary muscle, which is what lets the eye change focus for near objects. Paralyze it and you get cycloplegia: the wearer could open her eyes wide and look lovely, but she could not read, sew, or see anything close to her face with any clarity. Blurred distance vision and a painful sensitivity to light came with the territory, because a pupil that cannot constrict cannot protect the retina from bright sun.

The price of the look

Used over months and years, the damage compounded. Chronic dilation and the strain of constant blur degraded vision, and accounts collected by the Museo Galileo in Florence note that prolonged use could lead to blindness. The eye is not built to sit wide open indefinitely.

Then there was the rest of the plant. Belladonna is one of the most toxic species in the eastern hemisphere, as Healthline’s history of its dark past lays out, and the danger was never confined to the eyes. Atropine absorbed in any quantity raises the heart rate, dries the mouth and skin, brings on confusion and hallucination, and in larger doses stops the heart. The old toxicology mnemonic for anticholinergic poisoning still circulates in medical schools: blind as a bat, mad as a hatter, red as a beet, hot as a hare, dry as a bone. Every line of it traces back to the same blocked signal that widened those pupils.

Renaissance women were not ignorant of the risk. Nightshade had a parallel reputation as a poisoner’s tool and a fixture of witchcraft lore, the kind of plant you handled carefully or not at all. The cosmetic use sat alongside that knowledge, which tells you something about how far the beauty standard could push.

A poison that became a medicine

The strangest turn in the story is that atropine never went away; it changed jobs. The exact property that made belladonna dangerous to vain Venetians made it useful to doctors. Ophthalmologists still use atropine drops to dilate the pupil for eye exams and to rest the ciliary muscle during certain treatments. Diluted low-dose atropine is now prescribed to slow the progression of nearsightedness in children, one of the more interesting developments in eye care over the past decade.

The compound shows up well beyond the eye, too. Atropine is on the World Health Organization’s list of essential medicines, used to speed a dangerously slow heartbeat and as an antidote to nerve agent and organophosphate pesticide poisoning. The molecule that blinded women chasing a wider gaze is, in the right dose, a drug that saves lives.

The company it kept

Belladonna was not a lone act of beauty risk-taking. It belongs to a long run of cosmetics that traded health for an ideal, and its own century offers the clearest companion. While Italian women were dripping nightshade into their eyes, women across Renaissance and Elizabethan Europe were painting their faces with Venetian ceruse, a white lead compound that produced the prized pale complexion and slowly poisoned the skin beneath it. The Elizabethan tutorial recreates that ghostly pallor with pigments that will not corrode your face, and the same instinct, glamour first and consequences later, ran straight through the Victorian look, when arsenic complexion wafers were sold as a path to clear skin.

What ties them together is not stupidity. It is the predictable result of a beauty standard strong enough to override caution. People knew nightshade was dangerous, knew lead was, knew arsenic was, and used them anyway because the look mattered more in the moment than the slow bill coming due.

The dilated pupil never lost its pull, for what it is worth. We just stopped using poison to get it. Low light, a good camera, a little liner under the lower lash line, and the same wide-eyed softness arrives without the cycloplegia. The Venetians would probably have considered that a fair trade.