What does cross-tolerance means?
Definition of cross-tolerance : tolerance or resistance to a drug that develops through continued use of another drug with similar pharmacological action.
What’s an example of cross-tolerance?
Sometimes cross-tolerance occurs between two drugs that do not share mechanisms of action or classification. For example, in rats some amphetamine-like stimulants have been shown to exhibit cross-tolerance with caffeine, though this effect was not observed with amphetamine itself.
What are the three types of tolerance to a drug?
Tolerance typically is divided into three functional categories (acute, rapid, and chronic), but determining precisely which molecular underpinning underlies which class of tolerance (or if they are exclusive) can be difficult.
What does tolerance mean in drugs?
Listen to pronunciation. (… TAH-leh-runts) A condition that occurs when the body gets used to a medicine so that either more medicine is needed or different medicine is needed.
Do opioids have cross tolerance?
Although μ opioids show cross-tolerance, this is often not complete. This is important, particularly when switching drugs in highly tolerant patients. The equianalgesic tables often used to compare doses among opioids were obtained primarily from naïve patients and fall short when used in tolerant patients.
Do Benzos cross tolerance?
There is cross tolerance between alcohol, the benzodiazepines, the barbiturates, the nonbenzodiazepine drugs, and corticosteroids, which all act by enhancing the GABAA receptor’s function via modulating the chloride ion channel function of the GABAA receptor.
What is cross tolerance in opioids?
Cross-tolerance is the principle underlying methadone substitution in the treatment of heroin addicts. Although methadone produces opioid effects in heroin-addicted subjects, euphoria and side effects are minimized by the tolerance produced by long-term heroin exposure.
What are the 2 types of tolerance?
There are two types of drug tolerance: physiological and behavioral.
What are the different kinds of tolerance?
A tolerance is an acceptable amount of dimensional variation that will still allow an object to function correctly. Three basic tolerances that occur most often on working drawings are: limit dimensions, unilateral, and bilateral tolerances.
What are the types of drug tolerance?
There are two types of drug tolerance: physiological and behavioral. Physical tolerance occurs at the cellular level. The body increases the rate at which the drug is broken down (metabolized).
What is behavioral tolerance?
Behavioral tolerance describes the diminution of a drug-induced disruption of a goal-oriented behavior that is dependent upon learning processes, i.e., performance of the behavior while intoxicated. Impact of Psychoactive Drugs. Behavioral Tolerance.
What is incomplete tolerance of opioids?
However, when switching to another opioid, clinicians need to assume that cross-tolerance is incomplete, which means that the starting dose of the new opioid must be reduced by at least 50% of the calculated equianalgesic dose to prevent overdosing.[12]