Effect of low dose oral pill on haemostatic parameters in a set of Pakistani population

Nasir Ali Afsar, Qamaruddin Barakzai, Salman Naseem Adil

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1 Citation (Scopus)


Objective: To observe the adverse effects of low dose combination contraceptive pills on blood coagulation in a set of local population. Methods: Between December 2002 to December 2003 a comparative cross-sectional study was conducted at the Department of Pharmacology, Ziauddin Medical University, Karachi and Aga Khan University Hospital, Karachi. Fifty women of reproductive age were divided in two equal groups; one being the users of combination oral contraceptive pills (ethinyl estradiol and levonorgestrel) and the other being matching controls not taking any hormonal contraceptives. We studied, CBC, PT and INR, APTT, BT and platelet aggregation against ADP, collagen, epinephrine and ristocetin. Results: PT, INR, and platelet aggregation response to ADP, collagen, epinephrine, and ristocetin were not significantly different among the groups. However, APTT was shortened in users of contraceptives (p = 0.003). Conclusion: The referred oral contraceptive is associated with enhanced activity of intrinsic pathway of secondary haemostasis.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalJournal of the Pakistan Medical Association
Issue number5
Publication statusPublished - May 2008


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