Though some information charts say that it should be used with caution in patients with Diabetes,it refers to underlying conditions as
renal failure, hepatic impairment,IBS,stroke,clotting problems,asthma, allergies, CD/colitis,HTN,smoking,High LDL/HDL etc are present in your history.
So donot worry about anything.You can take the drug safely in lower doses to start with.
Also refer to page-http://www.ncbi.nlm.nih.gov/pubmed/304247 which talks about a case study.