Pharmacokinetics of cetirizine in tear fluid after a single oral dose.

Abstract:

BACKGROUND:Antihistamines (histamine H(1) receptor antagonists) are effective and convenient drugs for the treatment of allergic conjunctivitis. Because of the short duration of action generally observed for drugs administered topically to the eye, the oral route is often preferred. However, the presence of a selective barrier between blood and ocular tissues, the so-called blood-ocular barrier, does not allow a priori assessment of the most suitable dosage for ocular therapy. OBJECTIVE:To investigate the tear concentrations of cetirizine, a second-generation antihistamine, over time following oral administration, and to study the relationship between plasma and tear fluid concentrations. DESIGN AND PARTICIPANTS:Pharmacokinetic study of a single oral dose of cetirizine 10mg in 40 patients treated for allergic conjunctivitis. METHODS:Patients received a single oral dose of cetirizine. Samples of blood and tear fluid were taken according to predefined sampling schedules and the concentrations of cetirizine were determined by a new high performance liquid chromatography method. RESULTS:Concentration-time profiles for cetirizine in serum and tear fluid were similar, although the mean maximum concentration in tear fluid was reached later than in serum (90 and 30 min, respectively). However, at 60 and 120 min the cetirizine concentration in tear fluid was 98 and 92% of the mean maximum concentration, respectively, showing a plateau region and indicating that the disposition rate for the tear fluid compartment was very similar to that for the blood compartment. CONCLUSION:Oral administration of cetirizine yields therapeutically effective concentrations of the drug at the anterior surface of the eye.

journal_name

Clin Pharmacokinet

authors

Grumetto L,Cennamo G,Del Prete A,La Rotonda MI,Barbato F

doi

10.2165/00003088-200241070-00006

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

525-31

issue

7

eissn

0312-5963

issn

1179-1926

pii

410706

journal_volume

41

pub_type

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