Counterfeit (fake) and substandard antimalarial drugs may contain no active ingredients, less than the required amount of active ingredients, or ingredients not described on the package label. Manufacturers of counterfeit drugs tend to copy more expensive brands of drugs and make them look like brand-name drugs. They may also repackage expired products and substitute a later expiration date, or they may package another drug or alternative substance as if it were an active product. Substandard drugs are made by manufacturers trying to avoid costly quality control and good manufacturing practices; these can result from deliberate or unintended lapses in the manufacturing process. These medicines may have too little or too much of the active ingredients and may not be absorbed properly by the body. If they are taken to treat an illness like malaria, they may be incompletely effective or altogether useless. A counterfeit or substandard treatment can prolong illness and increase the risk of severe disease or death. If substandard medicines are widely used, they can also select for drug-resistant parasites. Source: Centers for Disease Control. Read more about CDC Counterfeit and Substandard Antimalarial Drugs.