Abstract: A transdermal analgesic applicator configured to provide a visual signal subsequent sufficient absorption of an analgesic compound ensuing the transdermal analgesic applicator being applied to the skin of a patient. The transdermal analgesic applicator includes a first layer that is impermeable and has integrally formed therewith on at least a portion thereof a plurality of microcapsules containing a thermochromic dye mixture. The first layer having the portion of microcapsules presents a first color at ambient room temperature and a second color at temperature greater than the first temperature as a result of being placed on the skin of a patient. A second layer containing an analgesic compound is secured to the first layer. The first layer changes from the first color to the second color subsequent the first layer changing from the first temperature to the second temperature, which the rate of temperature change is approximately equivalent to the absorption rate of the analgesic compound.