Aspirin is a widely used pain reliever and anti-inflammatory drug. The question of who invented aspirin has been a topic of debate for a long time. However, the most widely accepted answer is that it was invented by a German chemist named Felix Hoffmann [3].

Hoffmann was working for the German pharmaceutical company Bayer in 1897 when he developed aspirin [3]. He synthesized acetylsalicylic acid, the active ingredient in aspirin, as a treatment for his father's arthritis [3]. Aspirin was the first non-opioid, non-steroidal anti-inflammatory drug (NSAID) to be discovered, and it quickly became popular for its pain-relieving properties [2].

Aspirin has been used for over a century to treat a variety of conditions, including pain, fever, and inflammation [2]. It has also been shown to have a preventative effect on heart disease and stroke [2]. Aspirin is now available over the counter in most countries and is one of the most widely used drugs in the world [1].

In conclusion, the most widely accepted answer to the question of who invented aspirin is Felix Hoffmann, a German chemist who developed the drug while working for the pharmaceutical company Bayer in 1897 [3]. Aspirin has been used for over a century to treat pain, fever, and inflammation, and it is one of the most widely used drugs in the world [1][2].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ASPIRIN
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1894700/
[3] https://www.bbvaopenmind.com/en/science/scientific-insights/felix-hoffmann-the-man-who-invented-aspirin-and-heroin/