Abstract:
:Although a significant proportion of patients receiving nitrates are elderly, surprisingly little published work is available describing the pharmacokinetics and pharmacodynamics of these agents in elderly patients. The lack of pharmacokinetic data is related to the difficulty in assaying nitrates and there are at present no definitive data describing the effect of aging on their bioavailability or elimination. A common finding in old age is of decreased hepatic first-pass metabolism. This would affect isosorbide-2-mononitrate and isosorbide-5-mononitrate less than isosorbide dinitrate and nitroglycerin (glyceryl trinitrate). Venous responsiveness to nitrates does not appear to alter with age, so that pharmacodynamic properties would not be expected to alter. However, decreased baroreflex function causes an increased tendency for posturally related side effects to occur. Mechanisms of tolerance are likely to be unaltered but any possible alteration in quantitative aspects of tolerance has not been studied. Nitrate therapy in the elderly would benefit from systematic investigation. At the moment, therapy needs to be titrated to the individual patient, with care taken to avoid age-related side effects by careful initiation of therapy and appropriate reviews of each patient.
journal_name
Drugs Agingjournal_title
Drugs & agingauthors
Kelly JG,O'Malley Kdoi
10.2165/00002512-199202010-00003subject
Has Abstractpub_date
1992-01-01 00:00:00pages
14-9issue
1eissn
1170-229Xissn
1179-1969journal_volume
2pub_type
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