A monolithic device for transdermal administration of an active pharmaceutical ingredient which is selected from propargylamines and rivastigmine and is liquid at 25.degree. C., has an adhesive matrix layer which includes the active ingredient in an acrylic polymer pressure sensitive adhesive without cross-linker agent containing a metal atom, the adhesive having a shear value of between 1.5 and 15 hours, and further includes a non-volatile coadjuvant selected from squalene and triethylcitrate present in the layer in an amount of 1 to 15 wt %. The combination provides good release of the drug in use, reduces loss of the drug during a drying step in manufacture, reduces chemical interaction of the layer with the drug and achieves low level of skin irritation.