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...s. According to Hisamitsu, approximately 20 billion Salonpas [[transdermal patches]] have been sold in last 20 years.<ref>Hisamitsu Pharmaceutical Co., Inc. C ...detail/118028?contextCategoryId=6962 |accessdate=2010-03-05}}</ref> Unlike patches containing [[fentanyl]], topical analgesics containing menthol, methyl sali

...g [[counterirritant]]s, which are used to treat mild to moderate pain, and patches containing [[fentanyl]], a narcotic used to relieve moderate to severe pain ==Counterirritant patches==

..., from [[ethanol]]ic solution) 35-40% (sublingual, high-dose tablet) ~50% (transdermal) ~50% (intranasal) ...ministration = [[sublingual]], [[intramuscular|IM]], [[intravenous|IV]], [[transdermal]], [[intranasal]]

...enous, subcutaneous, intranasal, rectal, sublingual, transmucosal, buccal, transdermal (experimental) ...nding to have hallucinations from [[fentanyl]] administered through dermal patches and other dosage forms.

| bioavailability = 92% (transdermal)<br />89% (intranasal)<br />50% (buccal)<br />33% (ingestion) ...mination_half-life = (IV)= 2.5 minutes <br /> Intranasal = 6.5 mins <br /> Transdermal = 7 hours (range 3–12 h)

...t Corp for the relief of chronic pain, and has the advantage over fentanyl patches such as [[Duragesic]] of only needing to be applied once per week.