Stimulating effects of H1-antagonists.
Whereas antihistamines are generally known for their sedative side effects, this review shows that several studies also found mild stimulating effects on performance for the H1-antagonists terfenadine, ebastine, fexofenadine and desloratadine. These stimulating effects were mostly demonstrated in tasks involving high levels of attention, e.g. divided attention tasks, vigilance tasks and driving tasks. The stimulating effects of these antihistamines were often dependent of the given dose; however the relation was not always linear. The mechanism responsible for the stimulating effects of these four antihistamines is still unclear, though it is hypothesized that it involves other neurotransmitters like dopamine and GABA, or that it acts through the H3 histamine receptor. Further research is needed to clarify the ambiguous role of histamine in processes of arousal. In addition, it would be useful to determine whether terfenadine, ebastine, fexofenadine and desloratadine can return allergic patient's performance back to their preclinical level.
Theunissen
Eef L
EL
Experimental Psychopharmacology Unit, Brain and Behavior Institute, Faculty of Psychology, Maastricht University, The Netherlands. e.theunissen@psychology.unimaas.nl
Vermeeren
Annemiek
A
Vuurman
Eric F P M
EF
Ramaekers
Johannes G
JG
D000818:Animals; D000697:Central Nervous System Stimulants; D018765:Dopamine Uptake Inhibitors / Q000494:pharmacology; D006633:Histamine Antagonists / Q000494:pharmacology; D006634:Histamine H1 Antagonists / Q000494:pharmacology*; D006801:Humans; D018100:Receptors, Histamine H3 / Q000187:drug effects; D005680:gamma-Aminobutyric Acid / Q000502:physiology
D000697:Central Nervous System Stimulants; D018765:Dopamine Uptake Inhibitors; D006633:Histamine Antagonists; D006634:Histamine H1 Antagonists; D018100:Receptors, Histamine H3; D005680:gamma-Aminobutyric Acid