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Updated November 28, 2012

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Short-acting is a term used to describe a drug or other therapeutic agent that is quickly effective and has a short period of effectiveness, requiring repeated doses. Short-acting pain medications generally start working very soon after you take them. Examples of short-acting pain medications some people with back pain take are morphine or codeine.

Related: Choose an Effective Pain Medication for Your Neck Or Back Pain

Morphine and codeine are examples of short-acting pain medications.
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