Discuss louise's answer to: Prescription pain patches

Fentanyl transdermal patch (Durogesic/Duragesic/Matrifen) is used in chronic pain management. The patches work by releasing fentanyl into body fats, which then slowly release the drug into the bloodstream over 48 to 72 hours, allowing for long-lasting relief from pain. The patches are available in generic form and are available for lower costs. Fentanyl patches are manufactured in five patch sizes: 12 micrograms/hour, 25 µg/h, 50 µg/h, 75 µg/h, and 100 µg/h. Dosage is based on the size of the patch, since the transdermal absorption rate is generally constant at a constant skin temperature.

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