Cannabis Indica in Victorian Medicine

Before Victoria: cannabis enters European medicine

Hemp had been grown in Britain for fibre since the Tudor period, and its seeds appear in early modern herbals as a mild remedy for coughs and jaundice. But the psychoactive Indian variety — Cannabis indica as named by Lamarck in 1785 — was largely unknown to British physicians until the 1830s ^[1]. European awareness was filtered through travellers' accounts of bhang, ganja and charas in India and hashish in Egypt and Syria. Napoleon's troops famously encountered hashish in Egypt in 1798–1801, and French alienists, notably Jacques-Joseph Moreau, began experimenting with it as a model psychosis drug in the 1840s ^[2]. The British entry point was different: it came through colonial medicine in Bengal.

O'Shaughnessy and the 1839 Calcutta paper

William Brooke O'Shaughnessy, an Irish physician working at the Medical College of Calcutta, published On the Preparations of the Indian Hemp, or Gunjah in 1839 — the founding document of cannabis in Western medicine ^[3]. He reviewed Indian and Persian uses, ran dose-finding experiments on animals, and then trialled cannabis tincture and resin on patients with rheumatism, cholera, tetanus, hydrophobia (rabies), and infantile convulsions.

His tetanus and infant-convulsion cases were the most striking — he reported dramatic relief of spasms — and these results, more than anything else, persuaded British physicians to take the drug seriously ^[3]. O'Shaughnessy returned to Britain in the early 1840s carrying samples, and by 1843 commercial preparations were being sold by the pharmacist Peter Squire of Oxford Street as Squire's Extract ^[4].

What Victorian doctors actually prescribed it for

Between roughly 1840 and 1890, cannabis appeared in British and American medical journals as a treatment for a sprawling list of conditions. The best-evidenced uses in the period's own literature were:

• Migraine and neuralgia. John Russell Reynolds, physician to Queen Victoria's household, wrote in The Lancet in 1890 that 'Indian hemp, when pure and administered carefully, is one of the most valuable medicines we possess' — specifically for migraine, neuralgia, and senile insomnia ^[5]. He had used it for thirty years.
• Dysmenorrhoea (period pain). Reynolds and others recommended it; this is the source of the persistent claim that Queen Victoria was prescribed cannabis for menstrual cramps Disputed. Reynolds was her physician and did recommend cannabis for this indication in general, but no surviving prescription or court record confirms she personally received it ^[6].
• Tetanus and convulsive disorders, following O'Shaughnessy ^[3].
• Insomnia and 'delirium tremens' in alcohol withdrawal.
• Asthma (often smoked as part of compound 'asthma cigarettes', though stramonium was more common).

It was also tried, with poor results, for rabies, cholera, and the pain of terminal cancer ^[1][3].

Preparations and the standardisation problem

The standard Victorian preparations were Tinctura Cannabis Indicae (an alcoholic tincture of the resin), Extractum Cannabis (a semi-solid extract), and occasionally the crude resin itself. Doses listed in the British Pharmacopoeia of 1867 ranged from a few minims of tincture upward, titrated against effect ^[7].

The fatal practical problem — fatal to its clinical career, not to patients — was potency variation. Cannabis resin from different shipments, regions, and harvest years contained wildly different amounts of active material. Without any way to assay THC (which was not even identified until 1964 ^[8]), physicians could not predict whether a given dose would be subtherapeutic or produce frank intoxication. The Indian Hemp Drugs Commission Report of 1894, a 3,000-page British colonial inquiry, documented this variability extensively and concluded that moderate use was generally not harmful but that medical dosing was unreliable ^[9].

The decline, c. 1890–1930

Cannabis did not disappear from Victorian medicine because of moral panic — that came later, with the 1920s and 1930s prohibition wave. It declined for boring pharmacological reasons:

1. Aspirin (1899) displaced it for headache and neuralgia.
2. Injectable morphine and later barbiturates (1903 onward) offered reliable, titratable sedation and analgesia. Cannabis, being oil-soluble and orally erratic, could not compete.
3. Synthetic hypnotics like chloral hydrate (1869) and paraldehyde took over insomnia prescribing.

By the time the 1925 Geneva Convention added cannabis to the international drug control regime, it was already a marginal therapeutic agent in Britain ^[10]. It remained in the British Pharmacopoeia until 1932 and the US Pharmacopeia until 1942, but mostly as a legacy listing.

Myths and what the record actually says

A few common claims about Victorian cannabis deserve correction:

• 'Queen Victoria smoked cannabis for menstrual cramps.' Disputed She almost certainly did not smoke it. She may have received tincture from Reynolds, but there is no direct documentary evidence ^[6]. The claim is repeated endlessly online and traces back to inference, not record.
• 'Victorian cannabis was the same as modern weed.' No data The resin and tinctures used were whole-plant extracts of unknown cannabinoid ratios, often degraded by storage. Modern high-THC flower is not a like-for-like comparison.
• 'It was a wonder drug suppressed by Big Pharma.' Anecdote It was displaced by drugs that simply worked more reliably for the same indications. The later prohibition story is real but separate from the Victorian clinical decline.

The honest summary: cannabis had a genuine, roughly fifty-year run as a respectable Victorian medicine, championed by serious physicians, and was abandoned mainly because newer drugs were easier to dose.

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