Ask your health care provider any questions you may have about how to use Darvon. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Reilly cited ASHP policy, the scientific literature, resources such as the koper propoxyphene dar Criteria, and the Agency for Healthcare Research and Quality to state its case for the withdrawal of propoxyphene. Com provides free, accurate and independent advice on more than 24,000 prescription drugs, over-the-counter medicines natural products. Note hope they are successful in removing propoxyphene in all forms from the market. When combined with medications that possess anticholinergic activity, this effect on intestinal muscles may be accentuated leading to constipation.