Treating sexually transmitted diseases in the 1800s was painful, often toxic, and guided more by guesswork than science. Mercury was the cornerstone treatment for syphilis, botanical resins were used for gonorrhea, and silver nitrate was injected directly into the urethra for various infections. For most of the century, doctors didn’t even agree on whether syphilis and gonorrhea were the same disease, and the actual organisms causing these infections wouldn’t be identified until the century’s final decades.
Mercury: The Backbone of Syphilis Treatment
If you contracted syphilis in the 1800s, your treatment almost certainly involved mercury in some form. The most common method was a blue-gray ointment made from metallic mercury mixed with animal grease, rubbed into the skin once or more times daily for months at a stretch. Sanatoriums offered month-long inpatient stays dedicated entirely to mercury treatment, where patients submitted to this routine under medical supervision.
The logic behind mercury treatment came from an older medical framework. Doctors believed that toxic substances could flush disease from the body. Mercury absorption through the skin and inhalation of its fumes caused massive salivation and heavy sweating, which practitioners interpreted as the body expelling whatever evil agent caused the illness. The treatment was considered “working” when these side effects appeared. Patients also took mercury in pill form, and later in the century, doctors began experimenting with injecting organic mercury compounds under the skin.
The side effects were brutal. Chronic mercury exposure caused loosening and loss of teeth, ulceration of the gums and cheeks, kidney damage, tremors, and neurological deterioration. Many patients suffered as much from the cure as from the disease itself, giving rise to a famous saying of the era: “A night with Venus, a lifetime with Mercury.”
Gonorrhea and Botanical Remedies
Gonorrhea was treated differently from syphilis, at least by doctors who recognized them as separate conditions. The primary remedies were plant-based, with copaiba oleoresins (thick, aromatic resins from South American trees) among the most widely used. These resins were swallowed or prepared as balsams, and they actually showed some effectiveness against the gonococcal bacteria, though no one at the time understood why. Sarsaparilla root was another popular remedy, promoted heavily in patent medicines and prescribed by physicians who followed different theoretical schools of thought.
For urethral symptoms like burning and discharge, a more direct approach was common: a rubber syringe filled with diluted silver nitrate or mercury solution was inserted into the urethra and the liquid instilled directly at the site of infection. These syringes, manufactured by companies like the Hanover Rubber Company, were standard medical equipment by the 1850s. The procedure was exactly as unpleasant as it sounds, and while silver nitrate did have genuine antiseptic properties, the treatment could cause scarring and strictures that created new problems.
What Doctors Thought Caused STDs
For much of the 1800s, the actual cause of venereal diseases remained a mystery. Before germ theory took hold in the latter part of the century, explanations ranged from corrupted air and planetary influences to divine punishment for sinful behavior. Followers of the ancient physician Galen argued that syphilis arose from corrupted air or even an imbalance of bodily fluids, similar to how they explained lovesickness. Religious authorities maintained that the loathsome symptoms were signs that the sick person housed a debauched and sinful soul.
This moral framing had real consequences for patients. The shame attached to venereal disease meant many people avoided seeking treatment, turned to quack remedies sold discreetly through the mail, or waited until their symptoms became impossible to hide. Some doctors even blamed transmission on morally innocuous activities like drinking from a shared cup or kissing friends in church, which muddied any practical understanding of prevention.
A Major Breakthrough: Separating Syphilis From Gonorrhea
One of the century’s most important advances came from the French physician Philippe Ricord. In his 1838 treatise on venereal diseases, Ricord established that syphilis and gonorrhea were two entirely different conditions with their own causes and characteristics. Before this, many doctors treated them as variations of the same illness, which meant patients often received the wrong treatment entirely.
Ricord’s key insight was that syphilis could be transmitted through inoculation and produced a characteristic ulcer (the chancre), while gonorrhea could not be spread the same way and presented differently. Using a mirror to examine patients, he even identified the syphilitic ulcer on the cervix, something previous physicians had missed. He also classified syphilis into three stages: primary, secondary, and tertiary. That staging system is still used today. His work was a turning point, pushing venereal disease treatment from guesswork toward something more systematic.
Specialized Hospitals and Institutional Care
The 1800s saw the growth of dedicated institutions for venereal disease patients. London’s Lock Hospital, established in the previous century, continued operating as one of the most prominent. These institutions served a dual purpose: isolating patients who were considered both medically contagious and morally dangerous, while also providing a controlled setting for trying new treatments.
The Lock Hospital even collaborated with the Foundling Hospital to treat children born with congenital syphilis, a tragically common condition. By 1761, fourteen children had already been transferred between the two institutions under a formal program. Doctors used these institutional settings to test whether any new therapeutic approaches might improve survival rates for infected infants, a population for whom mercury treatment was especially dangerous. The institutional environment gave physicians access to large numbers of patients and the ability to observe treatment outcomes over time, planting early seeds of what would eventually become clinical research.
Patent Medicines and Quack Cures
Alongside legitimate medical practice, a thriving market in patent medicines promised discreet cures for venereal disease. Sarsaparilla tonics were among the most popular, advertised in newspapers and sold by traveling salesmen. These products appealed to people who couldn’t afford a doctor, didn’t want to face the stigma of visiting one, or had already tried mercury and couldn’t tolerate the side effects.
The claims were extravagant and the ingredients often useless, though some patent medicines did contain mercury or other active substances in unpredictable amounts. Without any regulation of drug purity or advertising, patients had no way to know what they were actually taking. Some products contained alcohol or opiates, which at least dulled the pain of symptoms even if they did nothing for the underlying infection.
The Century’s Final Breakthrough
The most significant shift came at the very end of the 1800s and into the early 1900s, when germ theory finally took hold and scientists identified the specific organisms behind STDs. This set the stage for Paul Ehrlich’s development of Salvarsan, introduced as compound 606 (the sixth compound in the sixth series of experiments). It was the first scientifically developed, genuinely effective cure for syphilis. Ehrlich had already received the Nobel Prize in 1908 for related immunological work, and Salvarsan’s success validated a completely new approach to treating infectious disease: finding chemical compounds that could target specific microorganisms.
Salvarsan was far from perfect. It was a toxic arsenic-based compound, difficult to handle, and notorious for damaging veins during injection. But it rapidly replaced mercury, because for the first time in four centuries, doctors had a treatment that actually worked against the syphilis organism rather than simply poisoning the patient and hoping for the best.