Both Osteobiflex and Flexcarin are supplements and not true drugs..
As with all alternative medicines, there is no documentation to prove its efficacy or drug interactions. This means that there has been no extensive or valid studies done to prove its efficacy, it is an unproven medicine, and that is in fact why it is called a supplement and not a true drug. If its use had been proven, then it would have been a part of mainstream therapy.
According to studies which are however not truely independant studies, osteobiflex does not have any drug interaction with any drug, including the drugs that you are taking. Also, it has been used for a long time and no adverse effects have been reported till now.
So it is probably safe to take, but you should always consult your doctor before taking any new supplements.
You can look up here for an FDA article that deals on this:
http://www.fda.gov/oashi/aids/fdaguide.html
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