What is usualy the the starting dose for a fentanyl patch?

The lowest : Available dose form for Duragesic (fentanyl) is 12 microgram. The actual dose is usually based on prior oral morphine and congeners, and likel 25 or 50. These patches last 3 days, and short acting breakthrough products are also used together.

Varies: The dosing depends on how much opiate class drugs one is already taking. For those taking a relatively small amount and without evidence of tolerance, the starting dose is 25 mcg/hr. If one is taking higher doses of drugs such as oxycodone, morphine, hydromorphone or methadone, the starting dose could be 50, 75 or even 100 mcg/hr.