Medicine has come a long way, yet the era of 10 rare old treatments still haunts the annals of pharmacology. These once‑celebrated drugs could cure or alleviate serious conditions, but they often did so at a terrifying cost to the human body. Below we dive into each of these forgotten remedies, their intended uses, and the gruesome side‑effects that eventually sent them into obscurity.
10 Rare Old Medicines Overview
In 1926, researcher F. Hildebrandt observed two striking effects when testing a new compound on animals. At high doses it provoked convulsions resembling epileptic seizures, while at more moderate levels it simply boosted heart activity and respiration, particularly useful in cases of depressant poisoning such as excessive chloroform.
One might assume physicians would employ it as an antidote, but that was far from the truth. Instead, in 1934, Ladislas J. Meduna pioneered its human application to deliberately induce convulsions as a therapeutic measure for mental illness.
Meduna’s primary focus was schizophrenia, making Metrazol the first officially recognized treatment for that disorder. The drug’s use soon broadened to other psychiatric conditions, including severe depression. Typically, patients were admitted, given Metrazol, and monitored as the rapid convulsive reaction set in; most were discharged after only a few hours.
At the time, it was deemed effective for psychoses lasting less than three years. Yet the side‑effects, while initially limited, could be catastrophic: spinal fractures, tuberculosis activation, and even brain injury were reported. Fortunately, Metrazol’s popularity waned quickly, replaced by the more controlled electroconvulsive therapy, which reduced physical trauma.
Despite its grim reputation, Metrazol persists in modern laboratories, where it is used to provoke seizures or anxiety in rodents for research into similar human disorders. There is even renewed interest in its potential role for treating Down syndrome, though it would not be curative.
9 Tribromoethanol
As its name suggests, tribromoethanol shares a lineage with the ubiquitous spirit we call alcohol, yet it packs a far more potent punch and brings a wider array of possible complications. Willstatter first synthesized the compound in 1923, and by 1926 Duisberg introduced it as an anesthetic agent.
When administered rectally, the drug works with startling efficiency: half the dose is absorbed within ten minutes, and a full 95 % penetrates the system by twenty‑five minutes, ushering the patient into a deep, predictable sleep that typically endures for about two and a half hours.
The catch? Once the hypnotic state was achieved, there was essentially no known antidote to rouse the patient. This inability to reverse the sedation made tribromoethanol a poor choice for clinical practice, as physicians could not safely control the depth or duration of unconsciousness.
Side‑effects were equally alarming, ranging from damage to the circulatory system to degeneration of liver and kidney tissue, a marked 15 % slowdown in metabolism, depletion of glycogen reserves, elevated blood‑sugar levels, and in the worst cases, death.
Today the drug no longer enjoys any therapeutic role in humans; instead, it serves as a sedative for laboratory mice, where its potent, uncontrollable sleep is useful for experimental protocols.
8 Bulbocapnine
Bulbocapnine earned a notorious reputation when it surfaced in the shadowy MK‑Ultra program. Chemically akin to apomorphine, it is harvested from the plant Corydalis cava. Its pharmacology is a study in contrast: in cold‑blooded creatures it mirrors morphine’s analgesic and sedative properties.
Conversely, in warm‑blooded animals—including humans—it triggers catalepsy, a rigid, immobile state where the subject remains locked in a fixed posture, essentially frozen in place.
The degree of this muscular rigidity scales with the animal’s evolutionary development: apes, dogs, and especially humans exhibit the most pronounced cataleptic response. Higher doses also raise the odds of sudden narcoleptic episodes. In neutered animals, the drug oddly stimulates bowel movements and salivation, a side‑effect not observed elsewhere.
Low doses, roughly 0.1 mg, are tolerable without severe consequences, yet the compound offers little therapeutic benefit. It remains a tool for laboratory investigations and, historically, for clandestine interrogation. Present‑day research, however, is probing its potential against Alzheimer’s disease.
7 Picrotoxin
The name itself warns you: picrotoxin contains the word “toxin.” Extracted from the plant Anamirta cocculus, its toxic profile is well‑documented, though the onset of symptoms is often delayed.
Early signs of poisoning include vomiting, excessive salivation, rapid breathing, and a slowed heart rate accompanied by palpitations. These are quickly followed by loss of consciousness, violent seizures, and brief periods of respiratory paralysis, which may resolve spontaneously—but not always. Some patients have succumbed to asphyxia when breathing failed to restart.
Despite its dangers, picrotoxin found a niche as an antidote for barbiturate overdose, as it can stimulate patients under anesthesia. Its mechanism appears to involve competition with the neurotransmitter pathways that barbiturates target.
Curiously, comatose patients can sometimes tolerate doses many times the lethal threshold without apparent harm. Standard therapeutic dosing ranges from 1 to 3 mg administered at regular intervals, while the lethal dose can be as low as 0.357 mg per kilogram (about 28 mg for an 80‑kg adult).
There are documented cases where comatose individuals received up to 300 mg over a day or two without fatal outcomes, and even a staggering 2.134 g spread across eight days proved non‑lethal.
6 Thymol
Thymol, a fragrant constituent of the culinary herb thyme, may be familiar to many as an ingredient in the antiseptic toothpaste Euthymol. Historically, however, it was employed to battle fungal skin infections such as tinea and ringworm, as well as intestinal hookworm infestations.
When ingested for ringworm treatment, thymol can provoke classic poisoning symptoms: nausea, vomiting, and headaches. More unsettling side‑effects include deep depression, paradoxical bouts of giddiness, eventual collapse, and in extreme cases, death. Dosage is critical—1 to 2 grams taken every few hours, followed by a saline purge and thorough bowel evacuation, was considered the borderline between efficacy and safety.
For external skin conditions, a 1:10 mixture of thymol and typically alcohol is applied directly to the affected area, leveraging its antimicrobial qualities to eradicate the infection. This same property underpins its inclusion in toothpaste formulations.
While thyme offers antimicrobial benefits, it isn’t the most potent of the culinary herbs. Oregano, clove, coriander, and cinnamon outstrip thyme in microbial killing power. So if you’re craving a spice‑boosted remedy for a cold, a carrot‑and‑coriander soup beats a cinnamon latte.
5 Isonipecaine
The quest for an opioid‑like analgesic led to the creation of isonipecaine, introduced by Eisted and Schaumann in 1939. Better known today as pethidine, it remains a staple in modern maternity wards for managing labor pain.
Although praised for causing only mild respiratory depression—far less than morphine—and for suppressing the vomiting reflex, isonipecaine is infamous for inducing euphoria in up to 90 % of users, contributing to a notable addiction potential when used chronically.
Overall, its side‑effect profile surpasses that of natural opiates: it exerts minimal impact on respiration, circulation, and metabolic processes, making it appear safer at first glance.
Unfortunately, its short‑acting nature—peaking at roughly 45 minutes and lasting about two hours—limits its analgesic potency compared with a standard morphine dose. Recent findings also debunk earlier claims of reduced addiction risk, confirming that isonipecaine can be just as habit‑forming.
In overdose scenarios, the drug becomes markedly toxic: repeated high doses within a three‑ to four‑hour window can trigger disorientation, tachycardia, and severe respiratory depression.
Its role in labor remains well‑established; because it depresses respiration less than morphine or diamorphine, it poses a comparatively lower risk to both mother and newborn.
Beyond analgesia, isonipecaine relaxes smooth muscle, which can alleviate tension during contractions. However, this muscle‑relaxant effect may also prolong labor and influence the infant’s condition.
4 Intocostrin
Intocostrin entered the medical scene alongside Metrazol as a crucial adjunct in convulsive and electroconvulsive therapies. Its origins trace back to curare, a South American poison historically applied to arrow tips for hunting.
Curare’s primary action is to halt voluntary muscle movement, leading to a cascade where muscles progressively give way until the animal lies helpless, ultimately succumbing to respiratory failure—a fatal form of locked‑in syndrome. Interestingly, oral ingestion of curare is relatively harmless, allowing a victim to survive by sucking the poison out of a wound.
While curare itself offers limited therapeutic value due to the fine line between muscle relaxation and total paralysis, intocostrin proved more controllable. By delivering a dose sufficient to relax muscles without immobilizing breathing, clinicians could safely use it during convulsive treatments.
Intocostrin’s chief advantage lay in tempering the violent convulsions induced by therapies like Metrazol, thereby reducing the incidence of spinal fractures—a significant concern for patients undergoing such intense procedures.
Additionally, it serves as a spasm‑relief agent and an adjunct to anesthesia, further broadening its clinical utility.
3 Dinitrophenol
Dinitrophenol emerged as a promising, albeit controversial, therapeutic agent after its accidental discovery among World War I munitions workers who suffered lethal exposures. Researchers quickly explored its potential medical applications.
Administered at 3–5 mg per kilogram, the compound boosted metabolic rate by 20–30 %, increasing oxygen consumption and offering a tantalizing solution for obesity treatment.
However, as dosages climbed, patients began to experience profuse sweating and a dangerous rise in core temperature—up to three degrees Celsius (5.4 °F). In toxic amounts, this hyperthermia was accompanied by rapid breathing, overwhelming the body’s capacity to supply sufficient oxygen.
The resulting hypoxia, coupled with fevers soaring to 43 °C (109 °F) or higher, precipitated a cascade of severe internal and external ailments, often culminating in death.
Although briefly employed to combat obesity, dinitrophenol’s chronic toxicity and propensity for fatal syndromes led to its swift abandonment. Today it finds use as a pesticide or as a component of the explosive mixture known as shellite.
2 Ergot
Ergot is a notorious fungus that colonizes rye and other cereals, infamous for causing ergotism—historically dubbed “St. Anthony’s Fire”—a gangrenous condition that may have fueled medieval witch hunts due to its psychotic and delirious manifestations.
Despite its dark reputation, ergot has long served therapeutic purposes. It can provoke powerful uterine contractions, making it useful for inducing labor or performing abortions.
Clinical practice dictates that ergot be administered only after the second stage of labor, following placental delivery, to prevent fetal suffocation. When used appropriately, it curtails postpartum hemorrhage by constricting blood vessels.
Historically, ergot was heralded as a universal remedy for internal bleeding, given its ability to contract vascular walls. However, prolonged treatment risks gangrene, a severe complication stemming from excessive vasoconstriction.
Beyond obstetrics, ergot derivatives have found a role in managing parkinsonism, leveraging their dopaminergic activity.
1 Santonin
Santonin, a bitter compound introduced in the early 1800s, became the primary remedy for roundworms and pinworms before safer alternatives emerged. It also saw limited use against whipworm, though it proved ineffective against tapeworms.
Patients reported an odd suite of visual disturbances: initially, everything acquired a blue hue, which then shifted to a luminous yellow aura around bright objects, while blues morphed into greens and deepened into near‑black. The intensity of these color changes correlated with the ingested dose.
Additional symptoms included nausea, vomiting, confusion, and, at higher concentrations, convulsions that could lead to asphyxia. Remarkably, the drug was excreted through multiple routes: the feces (alongside the expelled worms), urine (turning neon‑yellow), and even sweat, which acquired a yellow tint.
The underlying mechanism is straightforward: santonin attacks parasites directly, killing them before it becomes lethal to the host—a grim but effective trade‑off.
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