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APP 5 vs APP 6- which should I use?
Posted by Pam Bialiy on
The following article has been authored by John Heaney. Transdermal systems, or TDS, are often patches which when placed on the skin will deliver a drug over an extended period of time. Like any drug product, these need to be tested to ensure they are providing therapeutic benefit to the patients. In many cases, the best way to do this is performing a dissolution test using Apparatus 5, paddle over disk or watch glass, or Apparatus 6, the rotating cylinder. TDS are typically affixed to the apparatus using cellophane tape on the back (the part visible when the patch is...