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Two likely things: You would feel very parched and dry, and you would be very sleepy and groggy. At best, it is not a good idea, and at worst, it is a potentially dangerous idea to take double doses of any medication - even the over-the-counter ones.

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12y ago
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12y ago

depends what it is your giving your child i wouldn't recommend you double your dose especially if its a child could do more harm than good if your child's been taking the medicine for more than a few days and he/her condition isn't any better then maybe you've got the diagnoses wrong and need to go back to the doctors.

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Q: What happens if you take a double dose of antihistamine?
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How many milligrams of antihistamine can a person take at one time?

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