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Yes, it would be OK to take the Atarax now. The recommended dose of Benadryl is for it to be taken every 4-6 hours, so at 5 hours, the level in the blood stream is low enough to allow either a repeat dose of the Benadryl or a dose of the Atarax.
Of course, the Atarax can be sedating, so there is the usual recommendation to be cautious about using the drug when you need to be alert, such as driving, at least until you know how it will affect you. So, if you are in a situation where you absolutely will need to drive in the next few hours, that may be an issue. But there is not an issue with the Benadryl dose that was taken 5 hours ago.
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