How does Fioricet with Codeine interact with Fentanyl patches?

Duragesic (Fentanyl Transdermal) patches are used for Primary Chronic Pain; they last for up to 3 days depending on the patient and tolerance level. For example, I'm one of a small percentage of the population that only gets 48 hours from my patches, and that's due to my high tolerance level - I've been using them for 9 years.

Percocet (Oxycodone and Tylenol) is used for Breakthrough Pain - Breakthrough Pain is that pain which the patient feels after activity causes pain being controlled by the patches to exceed the pain controlling capability of the Fentanyl. Percocet, being an Acute pain drug, is used to compensate for the temporary increase in pain.

The combination of Fentanyl patches and Percocet is very common

• I myself have used the combination in varying strengths and doses

for a very long time. While I'm currently using the strongest doses available, at times I've had to increase my dosages and augment them with other opiates such as Demerol and MS Contin.