Timing of losartan and amlodipine administration
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Timing of Losartan and Amlodipine Administration: Pharmacokinetics and Food Effects
Food Intake and Drug Absorption: Losartan and Amlodipine
The timing of losartan and amlodipine administration in relation to meals can affect their pharmacokinetics. When a fixed-dose combination tablet containing amlodipine and losartan was taken with food, there was no significant change in the overall exposure (AUC) for amlodipine and losartan, but the active metabolite of losartan (EXP3174) showed a 19.1% reduction in AUC. Additionally, the peak concentrations (Cmax) of amlodipine, losartan, and EXP3174 were reduced by 11.4%, 20.0%, and 41.4% respectively, and the time to reach peak concentration (Tmax) for losartan and EXP3174 was delayed by 1.3 and 1.8 hours. Based on these findings, it is suggested that the combination tablet should be taken either 1 hour before or 2 hours after a meal to optimize absorption, especially for losartan’s active metabolite.
Once-Daily Dosing and Missed Doses
Both losartan and amlodipine are typically administered once daily. In older hypertensive patients, amlodipine provided greater and more sustained blood pressure reduction compared to losartan, even after two missed doses. After a 2-day drug holiday, patients on amlodipine maintained lower blood pressure levels than those on losartan, particularly for systolic blood pressure. This suggests that amlodipine may offer more consistent blood pressure control if doses are occasionally missed.
Early and Long-Term Administration Benefits
Starting losartan or amlodipine at the onset of prehypertension can prevent progression to hypertension. Early and long-term administration of losartan (16 weeks) was more effective than short-term use (6 weeks) and also more effective than amlodipine in reducing blood pressure, improving vascular remodeling, and enhancing vascular function. These benefits are likely due to losartan’s effects on the renin–angiotensin–aldosterone system, which amlodipine does not influence.
Combination Therapy and Blood Pressure Control
Combination therapy with losartan and amlodipine is effective for reducing 24-hour brachial and central blood pressure, especially in patients with advanced arterial stiffness. This combination shows dominant efficacy compared to other combinations, such as losartan with hydrochlorothiazide, in these patients.
Pharmacokinetic Equivalence of Fixed-Dose Combinations
Fixed-dose combinations of amlodipine and losartan (with or without other agents) have pharmacokinetic profiles equivalent to those of the individual drugs taken separately. This means that the timing of administration for the combination tablet can follow the same recommendations as for the individual drugs, with attention to food effects as noted above578.
Conclusion
For optimal absorption, losartan and amlodipine—especially when taken as a combination tablet—should be administered 1 hour before or 2 hours after meals, due to food’s impact on losartan’s active metabolite. Both drugs are effective as once-daily treatments, but amlodipine may provide more stable blood pressure control if doses are missed. Early and long-term administration of losartan offers additional vascular benefits, and combination therapy is particularly effective in patients with arterial stiffness. Fixed-dose combinations are pharmacokinetically equivalent to separate dosing, simplifying administration timing recommendations.
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