(CBS/AP) As pharmaceutical companies are approaching the final stages of development for a new type of painkiller said to be 10 times stronger than Vicodin, addiction experts worry a new wave of abuse may soon follow.

Four companies have begun patient testing on the pills which contain a pure version of the highly addictive painkiller hydrocodone, and one of them - Zogenix of San Diego - plans to apply early next year to begin marketing its product, Zohydro.

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Critics are especially worried about Zohydro, a timed-release drug meant for managing moderate to severe pain, because abusers could crush it for an intense, immediate high.