What is multi-source drugs?

Answer 1

Drugs are classified as single or multi source. This refers to the number of manufacturers of the drug. Single source drugs become multi source when new drug patent expires. For example, a new drug released to marketplace is considered single source for the length of the patent. Only one maufacturer can produce it, so there is a "single source". The day the patent expires and multiple manufacterers are allowed to produce therapuetical equiviquent, drug becomes multi source as it is produced by more than one source. This applies to both brand and generic drugs. When generics are released to marketplace, the first generic is considered to "hold original patent" and therefore is allowed to price as a brand. All other generics thereafter for that drug are called "non-innovators" and price as true generics.