Which of the following may be prescribed as a sleep aid?

Question

Quizplus · Accepted Answer

The sedative effect of antihistamines is thought to be caused by penetration of the agents into the brain,where inhibition of histamine N-methyltransferase and blockage of central histaminergic receptors occurs.There is also antagonism of other central nervous system receptors,such as serotonin and acetylcholine.The effect of drowsiness with the classic (older)antihistamines can be a major hazard if alertness is required,such as in operating heavy machinery (e.g. ,a car)or monitoring a patient.This effect can be so pronounced that diphenhydramine hydrochloride is added to acetaminophen in Tylenol PM,a compound described as a nonprescription sleep aid.

Which of the Following May Be Prescribed as a Sleep