N-acetylcysteine fails to attenuate haemodynamic tolerance to glyceryl trinitrate in healthy volunteers.

Abstract:

:1. The effects of chronic dosing with N-acetylcysteine (NAC), on nitrate-induced haemodynamic changes during the acute and chronic treatment of healthy volunteers with glyceryl trinitrate (GTN) patches (Transiderm nitro) has been investigated. 2. Seven volunteers were treated in a double-blind randomised crossover manner for two periods of 4 days with 20 mg of transdermal GTN/24 h together with NAC (200 mg three times daily) or matching placebo. There was a washout period of greater than 3 days between treatment periods. 3. Haemodynamic measurements (blood pressure (BP); heart rate (HR] at rest and following maximal treadmill exercise were performed before treatment and 4 h after starting treatment on days 1 and 4. 4. Significant haemodynamic changes as evidenced by a fall in BP and rise in HR, were seen on day 1 in both the NAC and placebo phases. By day 4 the haemodynamic changes had returned towards the pre-treatment values during both the NAC and placebo phases suggesting the development of tolerance in both treatment groups. 5. These findings suggest that concurrent administration of NAC fails to prevent the development of tolerance to GTN.

journal_name

Br J Clin Pharmacol

authors

Hogan JC,Lewis MJ,Henderson AH

doi

10.1111/j.1365-2125.1989.tb03522.x

subject

Has Abstract

pub_date

1989-10-01 00:00:00

pages

421-6

issue

4

eissn

0306-5251

issn

1365-2125

journal_volume

28

pub_type

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