Fentanyl

About Fentanyl

The patch is only for opioid-tolerant patients: people who have taken, for a week or longer, at least 60 mg of oral morphine a day, 30 mg of oxycodone, 8 mg of hydromorphone, 25 mg of oxymorphone, 60 mg of hydrocodone, 25 mcg per hour of fentanyl patches, or an equivalent dose of another opioid. It treats severe, persistent pain that needs an opioid when other options, including immediate-release opioids, cannot adequately treat it, and it is never used as needed, for short-term or mild pain, or for pain after surgery. Each patch is worn for 72 hours on flat, intact skin of the chest, back, side or upper arm; a few adults need a new patch every 48 hours.

Its boxed warnings cover addiction even at prescribed doses; slowed or stopped breathing; fatal overdose from accidental exposure to even one patch, especially in children; coma or death with benzodiazepines, alcohol or other sedatives; withdrawal in newborns after long use in pregnancy; overdose when medicines that block the liver enzyme CYP3A4 are added, or ones that speed it up are stopped; and overdose from heat. Heating pads, electric blankets, heat or tanning lamps, sunbathing, hot baths, saunas, hot tubs and heated water beds all raise the amount absorbed, so they are avoided, as is strenuous exercise that raises body temperature, and people with a fever are watched closely. It must not be used with significant breathing problems, acute or severe asthma without monitoring, or a blocked bowel. Nausea, vomiting, sleepiness, dizziness, trouble sleeping, constipation, heavy sweating, tiredness, feeling cold, poor appetite, headache and diarrhea are common.

As a Schedule II drug it cannot be refilled, and an unfilled electronic prescription can be transferred once. It falls under the Opioid Analgesic REMS: pharmacies can request prepaid mail-back envelopes for unused medicine, and prescribers are asked to discuss naloxone or nalmefene, which reverse an overdose; naloxone 4 mg nasal spray is sold without a prescription. Since 2025 the label stresses that higher doses carry more risk; after regular use the dose is tapered, not stopped suddenly. Makers stopped producing the fast-acting fentanyl absorbed through the lining of the mouth or nose (TIRF medicines such as Actiq and Fentora) in September 2024, and their REMS takes no new patients; hospital injections are not covered here.

Taking Fentanyl

How to take it

Apply each patch to flat, intact, non-irritated skin of the chest, back, side or upper arm and wear it for 72 hours, putting the next one on a different spot; for a young child or a person who might remove it, the upper back is preferred. Clip hair rather than shaving, clean the skin only with clear water, and never cut the patch.

If you miss a dose

Change patches on schedule. If one falls off, fold it sticky sides together, flush it and apply a new patch to a different site, as the label directs; never wear more patches than prescribed.

Storage

Store patches securely where children and others cannot find them. Right after removal, fold a used patch so the sticky sides stick together and flush it down the toilet; patches no longer needed are folded and flushed the same way, as the label directs.

Interactions to know about

Medicines that block CYP3A4, such as ritonavir, ketoconazole and erythromycin, raise fentanyl levels, and stopping rifampin, carbamazepine or phenytoin can do the same. Benzodiazepines, gabapentin, pregabalin, alcohol and other sedatives deepen its effect on breathing.

This summarizes the official prescribing information. Your prescriber’s and pharmacist’s instructions, and the leaflet that comes with your medicine, take priority.

Why the cash price for Fentanyl differs from pharmacy to pharmacy

With Duragesic discontinued, every patch is a generic, so quotes differ mainly by fee and markup. Pharmacies tend to stock only the common strengths, so an in-between strength such as 37.5 or 62.5 mcg per hour may need to be ordered, and quotes for it vary more.

Schedule II stock is ordered on a special DEA form, and wholesalers must flag unusual orders and may set their own ordering thresholds, so a pharmacy short of stock may fill only part of a prescription or turn it away.

Ways to pay less for Fentanyl without insurance

• Confirm the pharmacy has your patch strength before the prescription is sent; an unfilled electronic prescription can be transferred only once.
• If your dose is made of two patches of different strengths, ask the prescriber whether one patch of the combined strength would suit you, since each strength is priced separately.
• Ask for a partial fill if you may not need every patch; where state law allows, the rest can be collected within 30 days of the date written.
• Compare quotes from more than one pharmacy, since every patch is a generic and fees and markups differ.
• Upload the prescription to Script Unlock so licensed pharmacies can quote their cash price. You pay the pharmacy directly.

Questions to ask your pharmacist about Fentanyl

1. 1.Is my patch strength in stock, and can you fill the full quantity?
2. 2.Where should I put the patch, and what do I do if it falls off?
3. 3.Which of my medicines raise fentanyl levels or add to drowsiness?
4. 4.How do I dispose of used patches, and can I buy naloxone here?

Related medications