Humans have been using drugs for at least 5,000 years based on direct archaeological evidence, and likely much longer. Stone artifacts linked to peyote use in the Americas date back over 5,000 years, mushroom stones found in Mesoamerican ritual contexts date to around 3,000 BC, and chemical traces of fermented beverages go back roughly 13,000 years. If we broaden the definition to include any deliberate use of plants for their chemical effects, the timeline stretches deep into the Paleolithic, tens of thousands of years ago.
Prehistoric Plant Use
Direct archaeological evidence for plant use during the Paleolithic (roughly 2.5 million to 12,000 years ago) is rare, but it exists and is growing. Biomolecular analysis of ancient dental calculus has revealed traces of yarrow and other volatile oil-rich plants from the daisy family on Neanderthal teeth, suggesting these plants were consumed deliberately rather than accidentally. During the later Paleolithic, there is specific evidence for the use of poisonous and psychotropic plants, which implies early humans had already built a working knowledge of how different plant compounds affected the body and mind.
This makes intuitive sense. Early humans were constantly testing their environment for food, and any plant that produced a noticeable physical effect, whether pain relief, altered perception, or nausea, would have been remembered and shared. Long before anyone understood chemistry, trial and error created a practical pharmacology passed down through generations.
Ancient Alcohol and Psychoactive Plants
The oldest possible evidence of beer comes from Raqefet Cave in Israel, a burial site used between roughly 13,700 and 11,700 years ago. That predates agriculture, meaning hunter-gatherers were fermenting grain-based drinks before they were farming. A similar early fermented beverage, made from rice, honey, and fruit, appeared at the Jiahu site in China around 7,000 BC. Alcohol is, by a wide margin, the oldest psychoactive substance with solid chemical evidence behind it.
In the Americas, archaeological evidence of peyote use dates back over 5,000 years. Mushroom stones found in ritual settings across Mesoamerica go back to around 3,000 BC. Civilizations including the Olmec, Zapotec, Maya, and Aztec all used peyote, psilocybin mushrooms (which they called teonanacatl), and morning glory seeds. These weren’t casual experiments. They were woven into religious ceremonies and healing practices, with specific rituals governing who could use them and when.
The First Written Drug Records
The earliest detailed written record of medicinal substances is the Ebers Papyrus from ancient Egypt, dating to roughly 1,550 BC. It contains information on over 850 plant medicines, including garlic, juniper, cannabis, castor bean, aloe, and mandrake. One entry describes cannabis applied topically for inflammation. This wasn’t folk wisdom scribbled in the margins; it was an organized medical text with specific preparations and instructions for use.
Similar traditions developed independently across the ancient world. Chinese herbal medicine texts date back thousands of years, and the Indian Ayurvedic tradition compiled its own extensive plant-based pharmacology. By the time these systems were being written down, the underlying knowledge was already ancient, refined over countless generations of observation.
From Plants to Pure Compounds
For most of human history, drugs meant whole plants: chewing a leaf, brewing a tea, applying a poultice. That changed in the early 1800s when a German pharmacist’s apprentice named Friedrich Sertürner isolated morphine crystals from raw opium poppy juice. He reported his discovery in 1805 after testing it on animals and, boldly, on himself. Morphine was the first alkaloid (a naturally occurring chemical compound) ever isolated from any plant, and it launched an entirely new branch of science: alkaloid chemistry.
This was a turning point. Once scientists could extract and purify the active ingredient from a plant, they could standardize doses and study exactly what the compound did in the body. Over the following decades, researchers isolated caffeine, quinine, cocaine, and dozens of other compounds from their plant sources.
The Age of Synthetic Drugs
The next leap came when chemists learned to build drug molecules from scratch rather than extracting them from nature. The modern history of synthetic drugs traces back to 1763, when an English clergyman named Reverend Stone first described the fever-reducing effects of willow bark. Over the next century, researchers extracted and then synthesized the active compound, salicylic acid. In 1897, a Bayer chemist named Felix Hoffmann synthesized a modified version that was gentler on the stomach. Bayer marketed it as aspirin, and it became the world’s first blockbuster synthetic drug.
Bayer also introduced heroin in 1898, packaging and selling it in small bottles as a pain reliever and cough suppressant. At the time, there was no regulatory framework to evaluate whether a drug was safe or addictive before it went on sale. That wouldn’t change for years.
The same era produced another milestone: surgical anesthesia. On October 16, 1846, a dentist named William T.G. Morton publicly demonstrated that inhaling ether could eliminate pain during surgery, in an operation to remove a neck tumor at Massachusetts General Hospital. Before that moment, surgery meant being held down while fully conscious.
Antibiotics and the Modern Era
Alexander Fleming discovered penicillin in 1928 when he noticed mold killing bacteria in a petri dish at St. Mary’s Hospital in London. But the discovery sat largely unused for over a decade. It wasn’t until 1939 that researchers at Oxford University began intensive work to demonstrate penicillin’s ability to kill infectious bacteria. Clinical trials followed in 1943, and when results showed it was the most effective antibacterial agent ever tested, production scaled up rapidly. Penicillin was available in quantity to treat Allied soldiers wounded on D-Day in June 1944.
Antibiotics transformed medicine more than almost any other class of drug. Infections that had been death sentences became treatable overnight, and average life expectancy in developed countries jumped dramatically in the decades that followed.
When Drug Regulation Began
For most of history, anyone could sell any substance as medicine with no oversight. In the United States, the first major change came on June 30, 1906, when President Theodore Roosevelt signed the Food and Drugs Act. The law was pushed over the finish line by public outrage over Upton Sinclair’s novel “The Jungle,” which exposed horrifying conditions in the meatpacking industry. The law required accurate labeling of food and drug products and banned adulterated or misbranded goods.
That 1906 law was just the beginning. Subsequent legislation added requirements for proving safety before a drug could be sold (1938), proving effectiveness through clinical trials (1962), and the controlled substances scheduling system that classifies drugs by their medical value and potential for abuse (1970). The entire concept of a “legal” versus “illegal” drug is remarkably recent, barely a century old in a timeline that stretches back thousands of years.
Putting the Timeline in Perspective
If you compressed the entire history of human drug use into a single 24-hour day, the prehistoric period of chewing plants and brewing fermented drinks would occupy everything from midnight until roughly 11:55 PM. The isolation of morphine would happen at about 11:57 PM. Aspirin, heroin, and surgical anesthesia would arrive in the final two minutes. Penicillin, drug regulation, and everything we think of as modern pharmacology would fit into the last 45 seconds.
Drugs, in the broadest sense, are as old as humanity itself. What’s new is our ability to understand them, purify them, synthesize them, and regulate who gets access to them.