Tolerance to the sedative effects of antihistamines can develop quickly.

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The difference between them is really blurred." "Under some circumstances, the nonsedating formulas do cause sedation and in some cases, these sedating formulas do not," he tells Web MD.

"In some studies we reviewed, some people actually experienced more sedation with the newer, nonsedating formulas than with the older, sedating products.

Bender, Ph D, of National Jewish Medical and Research Center in Denver.

"The first-generation antihistamines are more sedating, but the distinction isn't as black-and-white as the marketing of the newer products may lead you to believe.

Most of the studies reviewed used doses that were twice the recommended amount -- 50 milligrams -- of diphenhydramine, the active ingredient in Benadryl and other first-generation "sedating" allergy medications.

"We're not saying that there's not a difference," says lead researcher Bruce G.Vitabiotics Beaming Baby Nelsons Baylis and Harding Jungle Formula Odaban Driclor Anhydrol Forte Perspirex Lemsip Beechams Tixylix Vicks Benylin Regaine Alpecin Florisene Nourkrin Alli Adios Zotrim Canesten Daktacort Daktarin Lamisil Mycota Curanail Nurofen Solpadeine Calpol Anadin Niquitin Minis Nicorette Nicotinell Niquitin Crafe Away Exorex Eumovate Epaderm EMLA Cream Bio-Oil Imodium Infacol Metanium Zovirax Anusol Germoloids Phenergan Stud 100 We are a responsible online chemist and offer an efficient, confidential service.All of our items are delivered in plain, sealed boxes or padded envelopes, with no advertising outside whatsoever.Always read the label and all product packaging before use.The dozens of types of allergy medication found at your local pharmacy can be overwhelming, but fear not.Anyway I'd like to know which of them (regardless as their branding as 'antihistamines') has the strongest affiliations with these receptors known for producing hypnotic properties.