Localized, sustained-release drug delivery uses membrane "envelope".
D003692:Delayed-Action Preparations; D006801:Humans; D008567:Membranes, Artificial; D008733:Methoxyflurane / Q000008:administration & dosage; D012995:Solubility
D003692:Delayed-Action Preparations; D008567:Membranes, Artificial; D008733:Methoxyflurane