Summary
Synopsis
Nilvadipine, a calcium antagonist of the dihydropyridine class, selectively blocks calcium channels in vascular smooth muscle. Compared with nifedipine, the prototype of the dihydropyridines, nilvadipine has a longer duration of action. The antihypertensive efficacy of nilvadipine appears to be comparable with that of nicardipine and nitrendipine, enalapril and captopril and hydrochlorothiazide/triamterene, although further clinical experience is required to establish the claimed advantages nilvadipine may have over the other dihydropyridine derivatives currently used to treat hypertension. Preliminary studies suggest that nilvadipine may also be useful in the treatment of patients with stable exertional or variant angina.
Studies conducted in Japan indicate that nilvadipine improves symptoms resulting from cerebral infarction in some patients, but further comparative studies are required to confirm these results.
The tolerability of nilvadipine appears to be comparable with that of nicardipine and better than that of nifedipine with respect to flushes, oedema and liver function abnormalities.
As is typical of calcium antagonists, there is no evidence of tolerance to the antihypertensive effects of nilvadipine. The drug is equally effective in treating hypertension in elderly and younger patients and does not appear to adversely affect glucose or lipid metabolism. Thus, provided its apparently good tolerability is confirmed by wider clinical experience, it should be a suitable alternative to other calcium antagonists when used alone or in conjunction with other drugs for the majority of patients with mild to moderate hypertension.
Pharmacodynamic Properties
Nilvadipine is a dihydropyridine calcium antagonist that selectively inhibits calcium-induced contraction of smooth muscle and has a longer duration of inhibitory action than nifedipine and nicardipine. The antihypertensive effects of nilvadipine have been demonstrated in healthy volunteers and in patients with hypertension. Heart rate is increased after single dose oral administration to healthy volunteers but is minimally affected during treatment of patients with essential hypertension. In patients with coronary heart disease, the decrease in blood pressure is accompanied by a decrease in vascular resistance and pulmonary artery wedge pressure and an increase in cardiac output. Nilvadipine selectively relaxes cerebral, coronary and vertebral arteries in vitro and attenuated infarcts produced by occlusion of cerebral arteries when administered to rats in vivo prior to occlusion. In a rat model of stroke, oral nilvadipine prevented neurological deficits and death at dosages lower than those required to decrease blood pressure. A single oral dose of nilvadipine increased cerebral blood flow in the affected side in patients with chronic cerebral infarction.
Oral administration of nilvadipine 8mg for periods of 12 weeks to 3 years did not influence glucose metabolism in patients with non-insulin-dependent diabetes mellitus or serum levels of aldosterone, adrenaline (epinephrine), noradrenaline (norepinephrine) or vasopressin in patients with hypertension. Similarly, nilvadipine either did not alter or tended to decrease serum levels of total cholesterol and low density lipoprotein (LDL) cholesterol and increase those of high density lipoprotein (HDL) cholesterol in patients with hypertension.
Nilvadipine has shown some antiatherogenic activity on animal models; however, the clinical significance of these findings is not known.
Pharmacokinetic Properties
There is a linear relationship between mean maximum plasma concentration (Cmax) of nilvadipine or area under the plasma concentration-time curve (AUC) and oral doses between 2 and 12mg in healthy volunteers. After oral administration of single doses of 4 and 8mg to Caucasian volunteers, Cmax values were 2 and 3.03 μg/L, respectively, while in Japanese volunteers, Cmax was 3.48 μg/L after a single 4mg dose and 6.69 μg/L after a 6mg dose. Following administration of nilvadipine 3 to 8mg 12-hourly for up to 21 days there was an increase in Cmax, AUC and trough plasma concentration compared with values after a single dose. Trough plasma concentrations also increased after repeated once-daily administration of a slow-release preparation. Nilvadipine undergoes considerable first-pass metabolism and absolute bioavailability has been estimated to be between 14 and 19%.
Apparent volume of distribution of nilvadipine was 24 L/kg after a single dose and 40 L/kg after repeated administration. Protein binding (determined by equilibrium dialysis) was about 98%, mainly to albumin. Nilvadipine is biotrans-formed to inactive metabolites, and the main metabolite, formed by oxidation of the dihydropyridine ring and subsequent cleavage of the methyl ester, accounted for up to 68% of the dose recovered in urine after repeated administration.
Elimination half-life in healthy volunteers, determined in studies employing a relatively short sampling time (24 to 32 hours), ranged from 9.76 to 18.2 hours. The pharmacokinetic properties of nilvadipine were not significantly influenced by renal impairment or age. There was an inverse relationship between Cmax and plasma albumin and a positive relationship between plasma nilvadipine concentration and the reduction in hepatic excretory capacity in patients with cirrhosis. The AUC in such patients tended to be higher than that in healthy volunteers.
A positive correlation between plasma nilvadipine concentration and antihypertensive effect was reported in elderly and younger patients with hypertension treated with nilvadipine 4 to 30mg daily for up to 28 days.
Therapeutic Efficacy
Noncomparative trials conducted mainly in Japanese patients with essential hypertension have reported that nilvadipine administered at a dosage of usually 4 to 8mg daily in 2 divided doses decreased mean systolic and diastolic blood pressure by about 8 to 14%. Antihypertensive efficacy appeared to be similar when nilvadipine was administered twice or 3 times daily as a standard-release product or once daily in sustained-release form.
In comparisons with the other dihydropyridine calcium antagonists nifedipine, nicardipine and nitrendipine, or captopril or enalapril, nilvadipine produced a similar decrease in blood pressure. Based on the median 24-hour blood pressure profile, the duration of action of nilvadipine was longer than that of nitrendipine. There appears to be no association between patient age and blood pressure reduction, although pretreatment blood pressure and the decrease achieved with nilvadipine were positively correlated.
In patients with blood pressure not adequately controlled by metoprolol 100 to 120mg daily, the addition of nilvadipine decreased mean arterial blood pressure by ≥13mm Hg or to ≤149/89mm Hg in 73% of patients. Similarly, combined treatment with nilvadipine plus hydrochlorothiazide/triamterene decreased diastolic blood pressure to>-90mm Hg in 70 to 80.6% of patients unresponsive to either drug alone, while a combination of nilvadipine and enalapril reduced blood pressure to this level in 53 to 58% of patients unresponsive to monotherapy with either drug.
Studies in which nilvadipine was administered for periods of up to 3 years have revealed no evidence that tolerance develops to the antihypertensive effect of the drug. The level of blood pressure achieved after 2 weeks of treatment with nilvadipine was maintained for the duration of the studies. In one uncontrolled study, treatment with nilvadipine for 6 to 12 months improved the quality of life in elderly patients with essential hypertension.
The clinical efficacy of nilvadipine has also been studied in patients with neurological sequelae resulting from cerebral infarct that had occurred at least 1 month before starting treatment. Symptomatic improvement was rarely marked, but was regarded as moderate in 20 to 55.6% of patients. There were no significant differences in efficacy between nilvadipine 4mg and nicardipine 60mg daily and greater improvement was seen in subjective and psychological symptoms than in neurological symptoms and ability to perform daily activities. Further comparative studies are required to determine the usefulness of nilvadipine in this clinical situation where unequivocal evidence of efficacy is difficult to establish.
Results of preliminary studies in patients with stable angina pectoris indicated that nilvadipine 4mg 3 times daily tended to be more effective than a low dose of diltiazem (30mg 3 times daily) in improving exercise performance and less effective than nifedipine 30mg daily in improving anginal symptoms. However, there were no significant differences between nilvadipine and the comparators in other criteria of efficacy. Preliminary studies suggest that nilvadipine may also be useful for the treatment of variant angina.
Tolerability
The adverse effects associated with nilvadipine, as with other calcium antagonists, result from its vasodilator effects and most commonly include flushes, headache, tachycardia, oedema, dizziness, nausea and sleep disturbances. Such effects are usually of mild to moderate severity and occur early in the course of treatment. The overall incidence of adverse effects was similar with nilvadipine 8 to 16mg daily and nifedipine 30 to 60mg daily, although the incidence of flushes, oedema and increases in serum alanine aminotransferase levels and the withdrawal rate were significantly higher with nifedipine than nilvadipine. In other clinical trials the tolerability of nilvadipine was comparable to that of metoprolol, nitrendipine, nicardipine and hydrochlorothiazide/triamterene, although enalapril appeared to be better tolerated than nilvadipine. Withdrawal of nilvadipine treatment because of adverse effects was usually necessary in about 1 to 5% of patients. Because adverse effect data were obtainable from only a small number of comparative clinical trials, the tolerability of nilvadipine relative to that of other calcium antagonists remains unclear.
Dosage and Administration
Nilvadipine is available as a standard-release film-coated tablet in Japan and as a sustained-release formulation in Europe. The recommended dosage in the treatment of hypertension is 4 to 8mg daily administered once daily as a sustained-release formulation or in 2 divided doses as a standard-release preparation. Dosage should be determined individually and adjusted to a maximum of 16mg daily in patients whose blood pressure is not adequately controlled at the lower dosage.
In Japan, nilvadipine is used to treat patients with sequelae of cerebral infarction. In this clinical situation the recommended dosage is 2mg twice daily, which may be increased to 4mg twice daily if necessary.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF03258534.
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Brogden, R.N., McTavish, D. Nilvadipine. Drugs & Aging 6, 150–171 (1995). https://doi.org/10.2165/00002512-199506020-00007
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DOI: https://doi.org/10.2165/00002512-199506020-00007