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Doses of hydroxyzine hydrochloride used for sleep range from 25 to 100 mg. [15] [16] [17] As with other antihistamine sleep aids, hydroxyzine is usually only prescribed for short term or "as-needed" use since tolerance to the CNS (central nervous system) effects of hydroxyzine can develop in as little as a few days.
It was a combination of theophylline, ephedra, [1] and hydroxyzine, and taken by mouth. [ 2 ] [ 3 ] It is no longer manufactured in the US due to approval of ephedra being withdrawn by the FDA . [ citation needed ]
Vistaril (hydroxyzine) – an antihistamine for the treatment of itches and irritations, an antiemetic, as a weak analgesic, an opioid potentiator, and as an anxiolytic; Vyvanse (lisdexamfetamine) – a pro-drug stimulant used to treat attention deficit hyperactivity disorder and binge eating disorder; Vyvanse is converted into Dexedrine in vivo
This drug has been withdrawn from the market in most countries. Hydroxyzine and secobarbital lengthen the half-life of brallobarbital. Because of this long half-life, it has symptoms resembling a hangover on the next day.
“The effect of hydroxyzine has also been tested on the ability of humans in the registration and storage of memory, and was used in comparison with relatively safe drugs, such as hydroxyzine, to illustrate the effects of benzodiazepines, which are thought to have adverse effects on the capacity of memory storage.”
Clorazepate, like other benzodiazepines, is widely distributed and is highly bound to plasma proteins; clorazepate also crosses readily over the placenta and into breast milk. Peak plasma levels of the active metabolite desmethyl-diazepam are seen between 30 minutes and 2 hours after oral administration of clorazepate.
The other group comprises those that are metabolized through glucuronidation, such as lorazepam, oxazepam, and temazepam, and, in general, have few drug interactions. [ 82 ] Many drugs, including oral contraceptives , some antibiotics , antidepressants , and antifungal agents, inhibit cytochrome enzymes in the liver.
Benadryl is not approved by the US Food and Drug Administration for treating anxiety. [40] On the other hand, hydroxyzine, a first generation antihistamine that lacks significant anticholinergic effects may be used to treat anxiety, although benzodiazepines and antidepressants are considered more effective by most clinicians. [41]