Biological drugs (sometimes known as "biologics" or "originators") are a type of medication that is derived primarily from biological sources. They are one of the most expensive drugs on the market due to their high cost and difficulty in development. Biosimilar drugs are similar to biologic medicines, but they are not an exact reproduction of the biologic and cannot be labelled a “generic” because of the natural variability involved in their development. The introduction of biosimilars was supposed to shake up the pharmaceutical industry, resulting in reduced prices and greater access to drugs. Market access, on the other hand, has been slower than many expected, with some claiming anti-competitive activities as a barrier to entry and expansion.