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I would like to know if it is possible to have a bad reaction to taking antihistamines, such as Reactine?

Yes, it is possible to have a bad reaction to antihistamines such as Reactine. Some people may be sensitive to these medications and may experience a reaction with other antihistamines as well. However, there are options like Aerius™ that may have a lower risk of causing a reaction. It is worth trying to see if it works for you.