Why is the patent period of drugs twenty years?

Not that the protection period of drugs is 20 years, but that of all invention patents is 20 years. To apply for a patent, a drug can only apply for invention, so the protection period is 20 years.

Then why is the protection period of the invention patent so long? Because there are provisions in the Paris Convention, the protection period of invention patents granted by member States shall not be less than 20 years.

Mainly from the definition of invention, invention is a relatively advanced scheme with a long life cycle. In addition, the inspection period of the invention is also long, so the period of gas protection should not be too short.