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Common side effects of antihistamines are drowsiness, which is why you should never drive or operate heavy machinery when taking them, dizziness, restlessness, nervousness and upset stomach. Other side effects, which aren't as common are dry mouth, dry nose, irritability, difficulty urinating and blurred vision. In most cases, the side effects from antihistamines are barely noticeable. However, the real problem with taking these drugs is not so much from what they do to you, but from what they don't do.

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Janet Torp

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3y ago

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