Although all of the patents for Darvon-N (propoxyphene napsylate) have expired, no generic version of this medication is available at this time. It is not exactly clear why no manufacturers have made a generic Darvon-N product. However, generic versions of regular Darvon are available that are fairly similar to Darvon-N and may be used interchangeably.
Can I Buy Generic Darvon-N?Darvon-N® (propoxyphene napsylate) is a prescription pain medication. Like many other pain relievers, it is a narcotic.
Brand-name Darvon-N is made by Xanodyne Pharmaceuticals, Inc. Although it is an older medication (and although the patents for Darvon-N have expired), no generic versions of this medication are available in the United States.
When Will Generic Darvon-N Be Available?This is a difficult question to answer. There are no legal reasons that a generic version of Darvon-N cannot be made. It is not clear why manufacturers have not chosen to make a generic version of this drug. Perhaps it would not be profitable for a manufacturer to go through the effort of formulating and seeking approval for a generic version of Darvon-N, especially since the medication has a relatively small market.
Is Propoxyphene a Generic Darvon-N?Although Darvon-N is not available in generic form, generic versions of regular Darvon® (propoxyphene hydrochloride) are available. In most situations, these products could be considered similar enough to Darvon-N to be used interchangeably, although a new prescription would be required before switching from Darvon-N to Darvon (or to a generic version of Darvon).
Darvon-N contains propoxyphene napsylate, compared to regular Darvon, which contains propoxyphene hydrochloride. There are a few important differences between the two forms of propoxyphene. Propoxyphene napsylate is less soluble in water, compared to the hydrochloride form, perhaps making it less prone to abuse by injection.