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The drug's plasma half-life is about two hours. [27] After administration, the time for the drug to reach peak plasma concentrations is 2 to 3 hours. [17] The percentage of the drug that is protein bound is 98%. [17]
Most oral PPI preparations are enteric-coated, due to the rapid degradation of the drugs in the acidic conditions of the stomach. For example omeprazole is unstable in acid with a half-life of 2 min at pH 1–3, but is significantly more stable at pH 7 (half-life ca. 20 h).
In healthy humans, the half-life of PPIs is about 1 hour (9 hours for tenatoprazole), but the duration of acid inhibition is 48 hours because of irreversible binding to the H,K-ATPase. [82] All the PPIs except tenatoprazole are rapidly metabolized in the liver by CYP enzymes (mostly by CYP2C19 and 3A4). [ 82 ]
Absorption half-life 1 h, elimination half-life 12 h. Biological half-life ( elimination half-life , pharmacological half-life ) is the time taken for concentration of a biological substance (such as a medication ) to decrease from its maximum concentration ( C max ) to half of C max in the blood plasma .
Pharmacokinetics: . Process of the uptake of drugs by the body, the biotransformation they undergo, the distribution of the drugs and their metabolites in the tissues, and the elimination of the drugs and their metabolites from the body over a period of time.
The duration of action of a drug is the length of time that particular drug is effective. [5] Duration of action is a function of several parameters including plasma half-life, the time to equilibrate between plasma and target compartments, and the off rate of the drug from its biological target. [6]
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 ...
Onset of action is the duration of time it takes for a drug's effects to come to prominence upon administration. With oral administration , it typically ranges anywhere from 20 minutes to over an hour, depending on the drug in question.