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Cross-tolerance is a phenomenon that occurs when tolerance to the effects of a certain drug produces tolerance to another drug. It often happens between two drugs with similar functions or effects—for example, acting on the same cell receptor or affecting the transmission of certain neurotransmitters .
One may also develop drug tolerance to side effects, [7] in which case tolerance is a desirable characteristic. A medical intervention that has an objective to increase tolerance (e.g., allergen immunotherapy, in which one is exposed to larger and larger amounts of allergen to decrease one's allergic reactions) is called drug desensitization. [8]
The increased GABA inhibition on the neural systems caused by benzodiazepines is counteracted by the body's development of tolerance to the drug's effects; the development of tolerance occurs as a result of neuroadaptations, which result in decreased GABA activity and increased excitability of the glutamate system; these adaptations occur as a ...
The mechanism by which barbiturate tolerance develops is believed to be different from that of ethanol or benzodiazepines, even though these drugs have been shown to exhibit cross-tolerance with each other [5] and poly drug administration of barbiturates and alcohol used to be common.
An equianalgesic chart can be a useful tool, but the user must take care to correct for all relevant variables such as route of administration, cross tolerance, half-life and the bioavailability of a drug. [5] For example, the narcotic levorphanol is 4–8 times stronger than morphine, but also has a much longer half-life. Simply switching the ...
tolerance – the diminishing effect of a drug resulting from repeated administration at a given dose; ... may cross-react with a number of sympathomimetic drugs. [255]
Tolerance is a fundamental property of the immune system. Tolerance involves non-self discrimination which is the ability of the normal immune system to recognize and respond to foreign antigens, but not self antigens. Autoimmunity is evoked when this tolerance to self antigen is broken. [5] Tolerance within an individual is normally evoked as ...
Tolerance dissipates after a few days, so doses can be spaced several days apart to avoid the effect. [6] A cross-tolerance can develop between psilocybin and the pharmacologically similar LSD, [90] and between psilocybin and phenethylamines such as mescaline and DOM. [91] Repeated use of psilocybin does not lead to physical dependence. [2]