Warfarin has a narrow therapeutic range and care is required with all concomitant therapy. The individual product information for any new concomitant therapy should be consulted for specific guidance on warfarin dose adjustment and therapeutic monitoring. Warfarin and its interactions with foods, herbs and other dietary supplements 434 Expert Opin. Drug Saf. (2006) 5(3) 10-hydroxywarfarin and 4′-hydroxywarfarin (minor pathway). Consider the benefits and risks before neuraxial intervention in patients anticoagulated or to be anticoagulated for thromboprophylaxis. Epidural or spinal hematomas that may result in long-term or permanent paralysis may occur in patients who are anticoagulated and are receiving neuraxial anesthesia or undergoing spinal puncture. The issue of herb-drug interactions looms large over the practice of herbal medicine. Up to now there have been very few incidents recorded of herb-drug interactions, but since the first such reports emerged a decade ago, a concern has been raised: that we know so little about herbs and their potential for interaction with drugs that these. Colesevelam is contraindicated in patients with GI obstruction because the drug causes constipation. Colesevelam is not recommended in patients with severe gastrointestinal motility disorders (e.g., ileus), gastroparesis, or previous major gastrointestinal surgery. Glucosamine (C 6 H 13 NO 5) is an amino sugar and a prominent precursor in the biochemical synthesis of glycosylated proteins and lipids. Glucosamine is part of the structure of the polysaccharides, chitosan, and chitin. Uses & Effectiveness? Possibly Effective for. Osteoarthritis. There is evidence that taking stinging nettle by mouth or applying it to the skin might reduce pain in people with osteoarthritis. Green tea interaction with blood thinners. Does it counteract the effects of blood-thinners like warfarin (Coumadin) and clopidogrel (Plavix)? ConsumerLab's answer explains. Most adverse events reported with warfarin are a result of over anticoagulation therefore it is important that the need for therapy is reviewed on a regular basis and therapy discontinued when no longer required. Use. Chondroitin sulfate has been studied for the treatment of arthritis; however, information on its effectiveness is conflicting. It is commonly given in combination with other agents, such as glucosamine sulfate or glucosamine hydrochloride.