Table of Contents

In 2024, the global market for erectile dysfunction (ED) medications is worth around $2.9 billion. It’s expected to grow steadily, with a projected annual growth rate of 6.53% from 2024 through 2034. Among these treatments, Viagra continues to lead the way.

Viagra’s success is a prime example of how medical breakthroughs sometimes happen by accident. Originally developed to treat a different condition, the drug ended up transforming the way doctors treat erectile dysfunction.

In this article, we’ll explore how Viagra was discovered, what it was meant to treat, the key studies that shaped its development, and how it became a global success story.

Key Takeaways

  • Viagra was not created for erectile dysfunction. It was originally developed by Pfizer to treat angina, a heart condition, by relaxing blood vessels to improve blood flow.
  • The discovery of Viagra’s true potential was accidental. Clinical trials aimed at heart relief unexpectedly revealed that the drug caused frequent erections in male participants.
  • Viagra’s launch filled a major gap in men’s health. Before its release, erectile dysfunction treatments were invasive and uncomfortable. Viagra introduced a simple, oral alternative.

What Was Viagra Originally Intended For?

In the mid-1980s, researchers at Pfizer’s lab in Sandwich, England, set out to develop a treatment for angina pectoris, a type of chest pain caused by reduced blood flow to the heart.

The goal was to create a drug that could dilate blood vessels, improve circulation, and relieve the chest pain that angina causes. Scientists believed that by relaxing the blood vessels, they could reduce the heart’s workload and increase oxygen supply.

By 1989, the Pfizer team had synthesized a compound called UK-92,480, which would later be known as sildenafil citrate.

This new molecule worked by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). Inhibiting PDE5 helps keep blood vessels relaxed and open, which was expected to be beneficial for people suffering from angina.

Who Invented Viagra?

Who Invented Viagra?

Scientists at Pfizer developed sildenafil, the active ingredient in Viagra. Key contributors included Dr. Nicholas Terrett and Dr. David Brown. Some sources also credit Peter Dunn and Albert Wood, though their roles are less clearly documented.

How Was Viagra Discovered?

In an interview with The Guardian, Dr. David Brown recalled that by 1993, the outlook for sildenafil wasn’t good. Pfizer had grown frustrated after years of investment without meaningful results. The company was ready to shut down the program entirely, seeing it as a failed effort.

As a final attempt, Brown and his team ran one last trial at a clinic in Merthyr Tydfil, a former coal-mining town in south Wales that had been hit hard by unemployment.

Volunteers were offered £300 to take part in the study, which involved staying overnight at the clinic for observation and blood sampling. The researchers hoped that increasing the dosage might finally produce better results for angina.

The following morning, participants were asked to complete a questionnaire that included a section on any unusual effects they had experienced. According to Brown, one man hesitantly mentioned experiencing spontaneous erections throughout the night. Other participants then reported similar effects.

Brown quickly realized the significance of what they had stumbled upon. The compound, intended to relax blood vessels around the heart, was also enhancing blood flow to the penis.

This side effect, while unrelated to angina, hinted at a completely different and potentially lucrative use–treating erectile dysfunction (ED).

In the early 1990s, ED was a condition with limited treatment options, often involving painful injections or awkward mechanical devices. A simple, oral medication that worked by enhancing natural physiological processes offered a groundbreaking alternative.

When Was Viagra Released?

When Was Viagra Released?

Recognizing the potential, Pfizer redirected its focus, conducting trials specifically targeting ED. The results were promising, leading to the US Food and Drug Administration (FDA) approving sildenafil for the treatment of erectile dysfunction on March 27, 1998.

It became the first oral treatment for ED, marketed under the brand name Viagra, offering a convenient and effective solution.

Viagra’s introduction was met with significant demand. Within its first year, it generated over $1 billion in sales, marking one of the most successful pharmaceutical launches in history.

The drug’s success reshaped public discourse around male sexual health and inspired the development of other PDE5 inhibitors like Cialis (tadalafil) and Levitra (vardenafil).

Beyond ED, sildenafil has been found useful in treating pulmonary arterial hypertension (PAH), a condition characterized by high blood pressure in the lungs’ arteries. In 2005, the FDA approved sildenafil under the brand name Revatio for this indication, showcasing the drug’s versatility.

Fun Fact: Viagra Goes Pop Culture

On July 25, 1999, popular TV show Sex and the City aired an episode titled “The Man, The Myth, The Viagra,” where Samantha Jones, one of the show’s boldest and most sexually liberated characters, dates an older man who uses the little blue pill.

Known for her confidence and unapologetic attitude toward sex, Samantha later tries Viagra herself in the following season to enhance her own experiences.

The storyline helped bring Viagra into mainstream conversations and highlighted that sexual health isn’t just a men’s issue.

Wrap-up

Viagra was originally developed to treat angina by improving blood flow to the heart. Although it didn’t work well for that purpose, researchers discovered it unexpectedly caused erections.

This led Pfizer to shift focus and test it for erectile dysfunction instead. After successful trials, the FDA approved Viagra in 1998, making it the first oral ED medication. It quickly became a blockbuster drug and changed how sexual health was treated.

What to Read Next

Don’t miss these related reads:

    • Viagra and Alcohol: Understand how alcohol affects Viagra’s effectiveness, potential side effects, and what doctors recommend.
    • Cialis vs. Viagra: A side-by-side comparison of two top ED medications, see how they differ in onset, duration, effectiveness, and more.

Frequently Asked Questions

Viagra is primarily manufactured by Pfizer at its production facilities, with major sites located in the United States and Ireland. The plant in Ringaskiddy, Ireland, has been one of the most recognized sources for producing the active ingredient sildenafil.

Viagra was originally created to treat angina, a form of chest pain caused by reduced blood flow to the heart. Researchers were aiming to develop a medication that could widen blood vessels and improve circulation.

Pfizer is the original developer and patent holder of Viagra. While the main patent has expired, allowing for generic versions, Pfizer still sells Viagra under its brand name in various markets.

Viagra was approved by the FDA in March 1998. It has been available for prescription use for over 25 years.

Scientists at Pfizer accidentally discovered Viagra’s effects on erectile function while testing a compound called sildenafil for heart-related chest pain. During clinical trials, male participants reported improved erections, redirecting its development toward erectile dysfunction treatment.

Before Viagra became available in 1998, men with erectile dysfunction often relied on treatments like penile injections (e.g., alprostadil), vacuum erection devices (pumps), penile implants, and psychological counseling. Some also tried herbal remedies and off-label medications, but these were typically less effective and not always safe.

Related Articles

Sources

Erectile Dysfunction Drugs Market Size, Share & Trends Analysis Report by product (Viagra, Cialis, Levitra/Staxyn), by mode of administration (Oral, Injectable), by region, and segment Forecasts, 2025 – 2030. (n.d.). https://www.grandviewresearch.com/industry-analysis/erectile-dysfunction-drugs-market

BioSpace. (2024, July 15). Erectile Dysfunction market to reach USD 3.9 billion by 2034, driven by product innovations and expanding treatment awareness. https://www.biospace.com/erectile-dysfunction-market-to-reach-usd-3-9-billion-by-2034-driven-by-product-innovations-and-expanding-treatment-awareness

Wilson, J. (2013, March 27). Viagra: The little blue pill that could. CNN. https://edition.cnn.com/2013/03/27/health/viagra-anniversary-timeline/index.html

Devlin, H. (2023, December 2). ‘It wouldn’t exist’: Viagra inventor tells how Welsh miners began its rise. The Guardian. https://www.theguardian.com/lifeandstyle/2023/dec/02/viagra-inventor-welsh-miners-began-rise-dr-david-brown

Kenny, U. (2002, March 31). Drug innovators: Dr Nick Terret and Dr Ian Osterloh, Viagra. The Guardian. https://www.theguardian.com/theobserver/2002/mar/31/features.magazine37

Shead, S. (2018, July 26). Viagra inventor raises $10m to find medicines for rare diseases with AI. Forbes. https://www.forbes.com/sites/samshead/2018/07/26/viagra-inventor-raises-10m-to-find-medicines-for-rare-diseases-with-ai/

Smith, B. P., & Babos, M. (2023, February 14). Sildenafil. StatPearls – NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK558978/

Nocera, J. (2017, December 6). Viagra History from sex icon to generic drug. Bloomberg.com. https://www.bloomberg.com/view/articles/2017-12-06/viagra-history-from-sex-icon-to-generic-drug?embedded-checkout=true

Lovelace, B., Jr. (2019, May 15). How Viagra revolutionized the erectile dysfunction market. CNBC. https://www.cnbc.com/2019/05/10/how-viagra-revolutionized-the-erectile-dysfunction-market.html

Osterloh, I. H. (2004). The discovery and development of Viagra® (sildenafil citrate). In Birkhäuser Basel eBooks (pp. 1–13). https://doi.org/10.1007/978-3-0348-7945-3_1