Which medicine is commonly used to treat headaches?

aspirin is the conventional name of the scientific name acetyl salisylic acid

The aspirin is a simple and wonderful thing .

I've got aspirin

Dorothy , Tylenol is the brand name for Paracetamol, also known as Acetaminophen.

But medically speaking I can't take aspirin but I use Tylenol.

Aspirin or Acetylsalacylic Acid is the modern, synthesized version whose origins lie in Willow bark which was used up to 2500 years ago.