The History of acetaminophen (Tylenol)

The History of acetaminophen (Tylenol)

The history of the drug acetaminophen, sold widely under the brand name Tylenol, spans over a century, marked by its discovery, initial rejection, re-discovery as an active metabolite, and eventual rise to global prominence.

Here is an overview of the history of acetaminophen and the Tylenol brand:

1. Discovery and Early History of Acetaminophen

• 1878: Synthesis: Acetaminophen (also known as paracetamol outside the US and Japan) was first synthesized by Harmon Northrop Morse.
• 1886: Accidental Discovery: The discovery of its therapeutic properties was a serendipitous event involving its chemical precursor, acetanilide. Doctors in Germany, Arnold Cahn and Paul Hepp, were mistakenly given acetanilide instead of naphthalene while treating a patient for intestinal worms. They found that the compound had no effect on the worms but was a potent fever reducer. Acetanilide was then marketed as “Antifebrin.”
• 1887-1893: Alternative Compounds: Concerns over the side effects of acetanilide led to the investigation of related compounds.
  
  
  • Phenacetin was introduced in 1887.
    
    
  • Acetaminophen was used to treat pain and fever beginning in 1893. However, it was initially shelved due to a false claim of a potential side effect.
    
    
• 1940s: Re-Discovery: Research in the 1940s established that both acetanilide and phenacetin were metabolized in the body to become acetaminophen, revealing that acetaminophen was the actual active agent responsible for the pain and fever relief.

2. The Launch of Tylenol

• 1950s: Renewed Interest: With the re-discovery and confirmation of its efficacy and safety (particularly when compared to the side effects of aspirin), interest in acetaminophen grew.
• 1955: Tylenol is Introduced:McNeil Laboratories (which was later acquired by Johnson & Johnson in 1959) introduced Tylenol Elixir for Children.
  
  
  • It was the company’s first single-ingredient acetaminophen product.
  • It was initially sold as a prescription medicine.
    
    
  • The brand name Tylenol was derived from the chemical name for acetaminophen: N-aceTYL-p-aminophENOL (APAP).
    
    
  • It was marketed as a safe alternative to aspirin, especially for children, because of aspirin’s association with stomach irritation and a link to Reye’s Syndrome in children.
    
    
• 1960: Over-the-Counter (OTC) Status: Tylenol became available without a prescription, paving the way for its widespread use.
  
  

3. The 1982 Crisis and Its Aftermath

• 1982: The Chicago Tylenol Murders: This was a defining moment for the brand and the pharmaceutical industry. Seven people died in the Chicago area after ingesting Extra Strength Tylenol capsules that had been laced with potassium cyanide after the product left the factory.
  
  
• Crisis Response: Johnson & Johnson’s response to the crisis is widely considered a classic example of effective crisis management:
  
  
  • They initiated a massive nationwide recall of all 31 million bottles of Tylenol capsules, prioritizing public safety over immediate profits.
    
    
  • They worked with federal officials to introduce tamper-resistant packaging, including triple-sealed safety containers.
    
    
  • The company also introduced a new form of the pill, the “caplet” (a tablet coated in gelatin), which was more difficult to tamper with than the old capsules.
    
    
• Legacy: The event led to the 1983 “Tylenol Bill” (making product tampering a federal crime) and the 1989 FDA federal guidelines requiring tamper-proof packaging for all over-the-counter drugs. Tylenol’s decisive action helped it regain its pre-crisis market share within a year.
  
  

Today, acetaminophen (Tylenol) is one of the most widely used and recommended over-the-counter pain relievers and fever reducers globally.²¹