One example is the common allergy drug diphenhydramine (also known by the brand name Benadryl). Though it eases allergy symptoms, it also suppresses the activity of the body chemical acetylcholine, and that leads to drowsiness and a host of other side effects, including dry mouth.
Intermediate care provides basic medical care. Skilled care provides more intensive medical care. Individuals are attended by professional nurses operating under the direction of physicians. They may be freestanding or part of a senior community, and are licensed by state and local health agencies.
Tertiary care is more specialized than care that is one rung above primary care - or specialist (secondary) level care. So, for example, if the specialist is an orthopedic generalist, then the tertiary care is specialized hand surgery.