What was the first commercially available semisynthetic morphine derivative?

• A. Hydromorphone
• B. Acetylmorphine
• C. Oxycodone
• D. Ethyl ether derivative; introduced as a cough sedative in 1898

Answer: (D)

Semisynthetic means chemists start with a natural product and modify it to make a new compound. Morphine was chemically altered by adding acetyl groups to produce diacetylmorphine, also known as heroin. This derivative was the first morphine-based drug to be marketed commercially, introduced by Bayer in 1898 as a cough suppressant. The acetyl groups increase lipid solubility, so the molecule crosses the blood–brain barrier quickly and produces a rapid, potent effect, which is why heroin became widely used (and later recognized for its high addictive potential).

Other options are later derivatives or not the classic first semisynthetic morphine derivative: hydromorphone and oxycodone are modifications developed after heroin, and the “ethyl ether derivative” doesn’t correspond to a recognized marketed morphine derivative from that era.