Amlodipine half life
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Amlodipine Half-Life: Key Pharmacokinetic Insights
Typical Elimination Half-Life in Healthy Adults
Amlodipine, a long-acting dihydropyridine calcium channel blocker, has a notably long elimination half-life compared to other drugs in its class. In healthy adults, the elimination half-life of amlodipine is generally reported to be between 30 and 50 hours, with most studies citing values around 34 to 36 hours after single intravenous or oral doses, and up to 45 hours after repeated dosing Abernethy1989Faulkner1986Lh1991+3 MORE. This extended half-life allows for effective once-daily dosing in the management of hypertension and angina.
Half-Life in Special Populations: Elderly and Liver Disease
The elimination half-life of amlodipine is significantly prolonged in elderly individuals, with studies showing values of approximately 48 hours or more, compared to about 35 hours in younger adults Abernethy1989Elliott1992Abernethy1990. This is likely due to reduced drug clearance in older patients. In patients with liver cirrhosis, the half-life can be even longer, reaching up to 60 hours, indicating that hepatic impairment leads to greater drug accumulation .
Half-Life in Renal Dysfunction
Unlike in liver disease, patients with renal dysfunction do not show significant changes in amlodipine half-life, suggesting that the drug is primarily cleared by the liver rather than the kidneys .
Half-Life in Overdose Situations
In cases of severe amlodipine overdose, the elimination half-life can be further delayed. This is thought to be due to saturation of hepatic metabolism, which slows down the clearance of the drug from the body .
Comparison with Other Calcium Channel Blockers
Amlodipine’s half-life is much longer than that of other dihydropyridine and non-dihydropyridine calcium channel blockers, which typically have half-lives ranging from 3 to 10 hours Abernethy1989Lh1991Jl1988. This unique property makes amlodipine particularly suitable for once-daily dosing regimens.
Conclusion
Amlodipine is characterized by a long elimination half-life, typically around 34–50 hours in healthy adults, and even longer in elderly patients and those with liver impairment. This pharmacokinetic profile supports its use as a once-daily medication for hypertension and angina, offering advantages over other calcium channel blockers with shorter half-lives Abernethy1989Faulkner1986Elliott1992+5 MORE.
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