Transdermal device having a phase change material

A transdermal device contains a phase change material and another material. The transdermal device may also contain a drug, a pharmaceutical, or a medicament mixed with or disposed near the phase change material. The phase change material transitions from solid to liquid form when heated. The other material is disposed, suspended, or held in the phase change material when the phase change material is in its solid form. When heat is applied to the transdermal device, the phase change material changes to a liquid state and the material that is held or suspended in the phase change material is released. Advantageously, such materials may include substances such as pharmaceuticals that boost or supplement the effect produced by a drug delivered transdermally by the device, or drug antagonists.