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. Author manuscript; available in PMC: 2017 Mar 16.
Published in final edited form as: Int J Pharm. 2016 Jan 16;500(0):255–267. doi: 10.1016/j.ijpharm.2016.01.031

Figure 1.

Figure 1

A select list of currently approved opioid analgesics drug products from Drugs@FDA database. Some of the products may not be available currently on the market. Left: number of approved products based on API; Middle: number of approved products based on route of administration; Right: List of dosage forms for oral route of administration. Last accessed on July 29th , 2014