Drug resistance is the reduction in effectiveness of a drug such as an antimicrobial, anthelmintic or an antineoplastic in curing a disease or condition. When the drug is not intended to kill or inhibit a pathogen, then the term is equivalent to dosage failure or drug tolerance. More commonly, the term is used in the context of resistance that pat...
Reduced effectiveness of a drug on a disease.
(from the article `malaria`) ...and coma—that frequently kills victims of P. falciparum malaria. Several strains of P. falciparum have developed that are resistant to some of the ...
The failure of cancer cells, viruses, or bacteria to respond to a drug used to kill or weaken them. The cells, viruses, or bacteria may be resistant to the drug at the beginning of treatment, or may become resistant after being exposed to the drug.
The ability of bacteria and other microorganisms to withstand a drug to which they were once sensitive (and were once stalled or killed outright). ... (12 Dec 1998) ... 
the ability of a microorganism to withstand the effects of a drug that are lethal to most members of its species.
the loss of drug effectiveness of a drug that had previously been able to control or kill an organism such as a virus.
The ability of a tumor cell to survive in the presence of drugs that are normally toxic.
Type: Term Definitions: 1. the capacity of disease-causing microorganisms to withstand exposure to drugs previously toxic to them; acquired either through spontaneous mutation or by gradual selection of relatively resistant strains after drug exposure. Pathogenic microorganisms resist antibiotics by various mechanisms, including the production of e...
Drug resistance: The ability of bacteria and other microorganisms to withstand a drug to which they were once sensitive and were once slowed in growth or killed outright.
ability of a microbe to persist and grow in the presence of an antimicrobial drug