I think its very unlikely; once a drug is removed from the market its hard to get it back on without changing its composition.
Keep your eye open for new alternatives; the pain drug market is a huge one - the drugs available aren't particularly effective - and, as you might expect, research is continuing to find new alternatives.
You might also want to looking into stress reduction/mindfulness therapies such as MBSR which studies have shown can reduce pain levels in some people.
I did see this list of possible replacements for Darvocet:
`The best alternatives to darvocet are rated as following: ★★★★★ hydrocodone ★★★★ percocet ★★★★ lortab ★★★ vicodin ★★ tramadol ★★ codeine
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