Drugs online research references
Nippon Yakurigaku Zasshi. 1988 May;91(5):275-83.
[Effects of terazosin on the blood pressure responses to tilting in conscious animals: comparison with prazosin]
[Article in Japanese]
Bessho H, Hara Y, Kimura Y, Narimatsu A, Horii D, Tobe A.
Pharmaceuticals Laboratory, Mitsubishi Chemical Industries, Ltd., Yokohama, Japan.
Inhibitory effects of terazosin on the compensatory blood pressure responses to tilting were studied in conscious rabbits and spontaneously hypertensive rats (SHR). In rabbits, doses which reduced the mean blood pressure by 15 mmHg were 330 micrograms/kg, i.v., for terazosin and 42 micrograms/kg, i.v., for prazosin, while those which depressed the blood pressure responses to tilting by 30 mmHg were 180 micrograms/kg, i.v., for terazosin and 54 micrograms/kg, i.v., for prazosin. In SHR, almost equal decreases in the mean blood pressure (about 30%) were observed by 1 mg/kg prazosin, p.o., 20 mg/kg hexamethonium, i.p., 3 mg/kg hydralazine, p.o., or 3 mg/kg nicardipine, p.o. In these conditions, prazosin and hexamethonium markedly depressed the blood pressure responses to tilting, whereas hydralazine and nicardipine showed little effect. The results with these antihypertensive drugs closely paralleled the established orthostatic profiles seen clinically. In this SHR tilting model, when the mean blood pressure was reduced by 15%, prazosin significantly depressed the tilting reflexes; however, terazosin produced no depression. Considering the dose ratio of terazosin to prazosin for antihypertensive effects and inhibitory effects on the tilting reflexes, the orthostatic liability of terazosin was about 3 times as low as that of prazosin. On the basis of these results, it is expected that terazosin causes less orthostatic hypotension than prazosin in clinical use.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2900798&dopt=Abstract
Mil Med. 1999 Oct;164(10):740-5.
The incidence of active duty dental patients taking antihypertensive medications.
Hennessy BJ, Kerns DG, Davies WG.
Billy Johnson Dental Clinic, Fort Hood, TX 76544-5063, USA.
Hypertension affects 58 million Americans. Dentists frequently encounter patients who are using one or more antihypertensive medications. This study evaluates the incidence of active duty soldiers dispensed antihypertensive medications at a large military installation. Lisinopril was the most frequently prescribed antihypertensive medication during a 2-month period in 1997 and was followed by hydrochlorothiazide, amlodipine, propranolol, felodipine, verapamil, atenolol, diltiazem, terazosin, clonidine, nifedipine, and metoprolol. These 12 drugs accounted for 93.46% of all antihypertensive medications dispensed. In this study, the percentage of active duty soldiers dispensed any antihypertensive medication was 1.51% (30 different medications were dispensed); 0.16% of all soldiers younger than age 30 and 1.25% of all soldiers older than age 30 were prescribed 1 of the 12 most commonly prescribed antihypertensive agents. Considering the same top-12 antihypertensive agents, the percentage of male soldiers younger than 30 who received a prescription was 0.24% and the percentage of male soldiers older than 30 who received a prescription was 4.3%. The percentage for males older than 40 receiving 1 of the 12 medications listed above was 12.05%. Similarly, the percentages for females were 0.27% for younger than 30, 1.87% for older than 30, and 3.51% for older than 40. Active duty males older than age 30 were more than twice as likely to be prescribed an antihypertensive agent than females in the same age group. Male active duty soldiers older than age 40 were more than 50 times more likely to be prescribed an antihypertensive agent than active duty males younger than 30.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10544631&dopt=Abstract
J Hypertens Suppl. 1985 Dec;3 Suppl 3:S231-4.
Cardiovascular effects of short-term selective alpha 1-adrenergic blockade with terazosin in patients with essential hypertension.
Beretta-Piccoli C, Ferrier C, Weidmann P.
Ospedale Italiano, Viganello, Switzerland.
The effects of selective alpha 1-adrenergic blockade with the agent terazosin on blood pressure and cardiovascular pressor responsiveness as related to major pressor factors were assessed in 17 patients with mild to moderate essential hypertension (mean age +/- s.e.m. 48 +/- 2 years). As compared with a 2-week placebo period, terazosin, given during 8 weeks at a maximal daily dose of 10.5 +/- 1.7 mg, caused a fall of supine arterial pressure (from 153/103 +/- 3/2 to 143/96 +/- 4/2 mmHg; P < 0.05), and a marked blunting of cardiovascular pressor responsiveness to norepinephrine (NE) as judged from the pressor dose (from 0.43 +/- 0.05 to 12.74 +/- 2.93 mmol/kg per min, P < 0.05) and from the shift to the right (P < 0.01) of the correlation relating NE-induced increments of arterial pressure to the corresponding increases of plasma NE during NE infusion. Heart rate, body weight, exchangeable sodium, blood volume, NE plasma clearance, plasma epinephrine, renin, angiotensin (ANG) II and aldosterone levels, the relationships between the ANG II-induced increases in arterial pressure or plasma aldosterone and the concomitant increments of plasma ANG II during ANG II infusion as well as the heart rate responsiveness to isoproterenol did not change significantly after terazosin. The findings of the present study suggest that the fall of arterial pressure induced by selective alpha 1-adrenergic blockade in patients with essential hypertension is associated and probably explained by inhibition of alpha 1-mediated, noradrenergic-dependent vasoconstriction.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2908818&dopt=Abstract
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