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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for her symptoms.1/2 tsf is ok at this age.
Please do not repeat the dose before 6 hours as you have given benadryl.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish her healthy life.Regards.