Synthroid and Anti-Histamines Reaction

[Andyb1205]

I take Reactine (also known as Zrtec or cetirizine) twice a day, in morning/afternoon and before bed for my allergies (pollen, dust). Is there any interaction between the two? I've started taking Synthroid before bed and would like to continue taking Reactine around then too.

Thanks

[greygoose]

You would need to leave at least two hours between the two.