Difenidol hydrochloride tablets do not treat insomnia. This drug is not a sleeping pill, it is an anti-dizziness and anti-emetic drug. It is indicated for the treatment of motion sickness and can also be used for the treatment of vertigo from various causes. The object of treatment refers to patients with dizziness accompanied by pronounced rotation of visual objects, a sense of tilting of the body when closing the eyes, and pronounced hallucinations of their own motion relative to external objects, which are well treated with oral difenidol. This drug can improve the blood supply to the vertebral basilar artery and regulate the function of the vestibular nerve, so that the vertigo can be relieved, and it can also play an antiemetic role to a certain extent. However, the side effects of this drug are also greater, especially in the elderly population is more obvious, often causing dry mouth, drowsiness, drowsiness, so some people may take it mistakenly thought to be able to treat insomnia, mainly related to its drowsiness side effects, in clinical use it can not be used to treat insomnia.