Zyrtec

Dennis Hammond

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Dec 9, 2025, 2:32:13 PM12/9/25

to 'Siegfried Othmer' via ISNR_Members_Forum

Does anyone know the effects of Zyrtec on the EEG?

Cory

Ed Hamlin

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Dec 9, 2025, 4:17:34 PM12/9/25

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Hi Cory,

I'm not sure about published work, but I have seen an increase in Theta activity - not as much as with first generation antihistamines, but still noticeable. Have others noticed this? Ed

On Tue, Dec 9, 2025 at 2:32 PM 'Dennis Hammond' via ISNR_Members_Forum <isnr_memb...@googlegroups.com> wrote:

Does anyone know the effects of Zyrtec on the EEG?

Cory

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David Cantor

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Dec 9, 2025, 4:33:03 PM12/9/25

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Yes it has sone sedative effects so increase in Theta has been noted with a decrease in beta and sometimes in alpha. ...there have been several studies to show this....thus it can offset benefits of ADHD meds or theta/beta training protocols.

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Michael Sitar

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Dec 9, 2025, 5:08:35 PM12/9/25

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Might need to clarify which type of Zyrtec.

Since there is Zyrtec antihistamine and

Zyrtec D which has a decongestant (pseudoephedrine) ... which appears to be stimulating ('may interfere with sleep')

m. sitar

On Tue, Dec 9, 2025, 2:32 PM 'Dennis Hammond' via ISNR_Members_Forum <isnr_memb...@googlegroups.com> wrote: