Amlodipine assessments
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Amlodipine Assessments: Safety, Efficacy, and Pharmacokinetics
Safety Profile of Amlodipine
Amlodipine, a widely used calcium channel blocker, has been extensively studied for its safety profile. In a comprehensive analysis involving 4,227 subjects, amlodipine was found to have a slightly higher incidence of side effects compared to placebo, primarily due to edema, which was generally well tolerated. When compared to beta-blockers like atenolol and nadolol, amlodipine demonstrated a favorable safety profile, with fewer severe side effects reported . Additionally, amlodipine did not cause adverse changes in serum creatinine, urate, fasting glucose, cholesterol, or triglyceride levels, unlike hydrochlorothiazide and nadolol . It was also well tolerated by elderly patients and did not require dosage adjustments for renal impairment, although the dosage regimen for hepatic impairment remains undetermined .
Efficacy in Angina and Hypertension
Antianginal Efficacy
Amlodipine has shown significant efficacy in reducing the frequency of angina episodes and nitroglycerin consumption in patients with angina pectoris. In a double-blind crossover study, patients treated with amlodipine experienced a notable reduction in angina frequency and nitroglycerin use compared to placebo . Furthermore, amlodipine significantly increased peak oxygen consumption and endurance time during exercise tests, indicating improved exercise tolerance . In patients with vasospastic angina, amlodipine effectively reduced the rate of anginal episodes and nitroglycerin tablet consumption, with peripheral edema being the only notable adverse event .
Antihypertensive Efficacy
Amlodipine has been proven effective in lowering blood pressure in patients with mild to moderate hypertension. In a multicenter, placebo-controlled trial, different doses of amlodipine (1.25-10 mg) were evaluated, and significant reductions in both supine and standing blood pressures were observed, particularly in the medium and high-dose groups . Amlodipine was well tolerated, with a low incidence of mild to moderate side effects . Additionally, in elderly hypertensive patients, amlodipine significantly reduced blood pressure without affecting cerebral blood flow, as measured by single photon emission computed tomography .
Pharmacokinetics and Bioequivalence
Pharmacokinetic Properties
Amlodipine's pharmacokinetic properties have been studied in various populations. In a study involving healthy Korean male subjects, two formulations of amlodipine (amlodipine camsylate and amlodipine besylate) were found to be pharmacokinetically equivalent, with similar plasma concentration-time profiles and no significant differences in pharmacodynamic profiles . Similarly, in healthy Chinese male volunteers, a newly developed dispersible tablet formulation of amlodipine besylate was bioequivalent to an established branded formulation, with both formulations being well tolerated .
Sex Differences in Pharmacokinetics
A study assessing sex differences in the pharmacokinetics and pharmacodynamics of amlodipine found that while bioavailability was slightly higher in females, this was attributed to their lower body weight. No significant sex-related differences in drug clearance were observed, and both formulations were considered bioequivalent within each gender group .
Cardioprotective Effects
Amlodipine has demonstrated cardioprotective effects in ischemic-reperfused hearts. In animal models, amlodipine reduced myocardial oxygen consumption and coronary vascular resistance, decreased the development of ischemic contracture, and improved the return of contractile function after reperfusion. These effects suggest that amlodipine reduces myocardial ischemic injury by lowering myocardial oxygen demand and positively influencing transmembrane calcium fluxes during ischemia and reperfusion .
Conclusion
Amlodipine is a well-tolerated and effective calcium channel blocker for the treatment of hypertension and angina. It has a favorable safety profile, significant efficacy in reducing blood pressure and angina episodes, and demonstrates bioequivalence across different formulations and populations. Its cardioprotective effects further enhance its therapeutic value in managing cardiovascular conditions.
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