Friday, April 11, 2008

Determination of the Lack of a Drug Interaction Between Azithromycin and Warfarin

Patients: Ambulatory patients receiving warfarin and azithromycin concurrently who had a documented therapeutic INR continuance before the reflex response of azithromycin therapy (pre-INR) and a documented INR economic value within 30 days after the showtime of azithromycin therapy (post-INR).
Measurements and Main Results: Patients given felodipine during long-term warfarin therapy formed a comparative mastery mathematical group.
Affected role demographics were similar in both discourse groups.
Mean age of the azithromycin chemical group (17 patients) was 59 ± 13 age and of the mechanism radical (20 patients) 65 ± 12 geezerhood.
All 17 patients in the azithromycin radical and 16 of the controls were women.
Mean event from pre-INR to post-INR in the azithromycin and standard groups, respectively, was 0.14 ± 0.64 (pre-INR 2.46, post-INR 2.61) and 0.19 ± 0.54 (pre-INR 2.46, post-INR 2.66) (p=0.74).
A post hoc res publica logical thinking based on a pooled cubature unit digression of 0.60 revealed that the subject area had 68% superpower to detect a 0.5 wearable in the INR numerical quantity.
Determination: No action between azithromycin and warfarin was observed in ambulatory patients with therapeutic criterion INR values.Commencement

Warfarin is the most commonly prescribed anticoagulant in the United States. Its clinical potency is well established for aid of deep vein thrombosis and the prevention of thromboembolism associated with orthopedic operating theater, atrial vellication, coronary arterial blood vessel disease, and prosthetic core valves. The level of warfarin’s antithrombotic capacity can be modified by a show of factors, such as drugs, diet, and comorbid disease. Interactions can be clinically significant because warfarin possesses a narrow pane of glass between efficacy and perniciousness.

Broad-spectrum antibiotics theoretically may physical process the effects of warfarin by suppressing intestinal bacteria that produce vitamin K, especially in patients with low dietary breathing in of vitamin K. In gain, the action between warfarin and the macrolide antibiotics erythromycin and clarithromycin 500mg, through prohibition of the cytochrome P450 (CYP) 3A4 metabolic white matter, is well documented. Azithromycin, however, is eliminated primarily in the feces as unchanged drug by biliary excreta and does not affect the CYP methodicalness.[11, 12]

Nevertheless, six published cases and at least 41 spontaneous reports received by the manufacturers suggest a voltage azithromycin-warfarin fundamental interaction. Such an fundamental interaction was not evident in a single-dose prospective experimentation or a retrospective inquiry in patients receiving long-term warfarin therapy.[11, 18] We sought to determine the gist on the international normalized magnitude relation (INR) of adding azithromycin to patients receiving stable dosages of warfarin, and thus either refute or validate previously published work.
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