patch

patch

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A transdermal patch is a medicated adhesive patch that is placed on the skin to deliver a specific dose of medication through the skin and into the bloodstream. An advantage of a transdermal drug delivery route over other types of medication delivery (such as oral, topical, intravenous, or intramuscular) is that the patch provides a controlled release of the medication into the patient, usually through either a porous membrane covering a reservoir of medication or through body heat melting thin layers of medication embedded in the adhesive. The main disadvantage to transdermal delivery systems stems from the fact that the skin is a very effective barrier; as a result, only medications whose molecules are small enough to penetrate the skin can be delivered by this method. The first commercially available prescription patch was approved by the U.S. Food and Drug Administration in December 1979. These patches administered scopolamine for motion sickness.
In order to overcome restriction from the skin, researchers have developed microneedle transdermal patches (MNPs), which consist of an array of microneedles, which allows a more versatile range of compounds or molecules to be passed through the skin without having to micronize the medication beforehand. MNPs offer the advantage of controlled release of medication and simple application without medical professional assistance required. With advanced MNPs technology, drug delivery can be specified for local usage, for example skin whitener MNPs that are applied to the face. Many types of MNPs have been developed to penetrate tissues other than skin, such as internal tissues of the mouth and digestive tract. These promote faster and more direct delivery of the molecule to the targeted area.

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