Increased INR with anticoagulants (e.g. warfarin). May decrease effect of diuretics and antihypertensive agents. Concomitant use with ACE inhibitor or angiotensin II antagonist may further deteriorate renal function. May increase rate of gastrointestinal ulceration with concomitant low dose acetylsalicylic acid. Increased plasma concentrations of ethinylestradiol, lithium, methotrexate, and other drugs metabolised by human sulfotransferases (e.g. oral salbutamol, minoxidil). Decreased plasma concentrations with rifampicin.
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