Pain medicine : the official journal of the American Academy of Pain Medicine
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Pain Med
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Two patients suffering from systemic sclerosis (SSc) were treated with the 25 micro/hr transdermal fentanyl patch for pain from either deltoid muscle tendinitis of the left arm or from ischemia of the left-hand thumb. When the medication was changed to either oral morphine or oral methadone, the effects did not correspond to the drug conversion table. These findings suggest that patients with SSc and other systemic skin diseases may be at risk for limited absorption of transdermal fentanyl. In contrast, no restriction of the absorption of transdermal testosterone was observed.