Salivary antipyrine half-life during injectable progestagen contraception.

Abstract:

:Antipyrine pharmacokinetics were studied in 6 healthy women before and 2, 8 and 12 weeks after administering the injectable progestagen (progestin), norethisterone (norethindrone) enanthate 200mg intramuscularly. Additionally, antipyrine kinetics in 5 women who had previously used the injectable contraceptive for 8 to 14 months were compared with values obtained in 14 non-users. Antipyrine was measured in saliva using a spectrophotometric method, following an oral dose of 18 mg/kg bodyweight. In the 6 women studied prospectively the mean salivary antipyrine half-life was 14.91 +/- 1.5 hours (SEM) before administering the injection, and 13.56 +/- 0.73 at 2 weeks, 15.13 +/- 1.86 at 8 weeks and 15.21 +/- 2.46 hours at 12 weeks after the injection. The mean antipyrine half-life in the 5 long term users of injectable progestagen was 14.21 +/- 2.53 hours compared with 13.66 +/- 0.98 hours in non-users. The results of this study suggest that - in contrast to published data on combined oral contraceptives - neither short nor long term use of parenteral norethisterone enanthate in Indian women is associated with significant alterations in antipyrine clearance.

journal_name

Clin Pharmacokinet

authors

Joshi JV,Gupta KC,Hazari KT,Gokral J,Pohujani S,Satoskar R

doi

10.2165/00003088-198611020-00007

subject

Has Abstract

pub_date

1986-03-01 00:00:00

pages

171-5

issue

2

eissn

0312-5963

issn

1179-1926

journal_volume

11

pub_type

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