Modern medicine often frames drugs as precision tools – engineered for a specific target, a specific disease, and a specific outcome. Yet history consistently shows us something different: once a compound enters the body, it rarely limits itself to a single pathway. Biology is interconnected, adaptive, and often far more creative than our original intentions.
This reality has given rise to one of the most powerful – and underappreciated – approaches in medicine: drug repurposing. Rather than starting from scratch, repurposing asks a simple but profound question: what else does this molecule do?
Food as the first repurposed medicineLong before pharmaceuticals, humans were already repurposing substances without realizing it. Many foods were consumed for flavor, sustenance, or tradition, only later to be understood as biologically active compounds.
Food as the first repurposed medicine
Long before pharmaceuticals, humans were already repurposing substances without realizing it. Many foods were consumed for flavor, sustenance, or tradition, only later to be understood as biologically active compounds.
These discoveries didn’t change how long humans had used these foods – they changed how we understood them.
The same principle applies to medications.
Here are a few examples of well-established drug repurposing. Each of these stories reinforces the same idea: a drug’s first use is not necessarily its most important one.
- Aspirin
Here are a few examples of well-established drug repurposing. Each of these stories reinforces the same idea: a drug’s first use is not necessarily its most important one.
- Minoxidil
Developed as an oral drug for high blood pressure and ulcers, clinicians noticed unexpected hair growth. This observation led to its widespread topical use for hair loss.
- Metformin
Originally created from the Galega officinalis plant (French lilac) to lower blood sugar in diabetes, metformin was later shown to influence cellular energy sensing and insulin signaling.
- Sildenafil (Viagra)
Initially developed for angina and hypertension, sildenafil failed at its original goal but revealed a powerful effect on blood vessel dilation: for erectile dysfunction and pulmonary hypertension.
- Statins
First derived from the Penicillium citrinum fungi microorganisms and intended to lower cholesterol, statins were later shown to reduce inflammation and stabilize arterial plaques.
- Ketamine
Long used as a general anesthetic, Ketamine was discovered to have rapid antidepressant effects.
