Nyquil: NyQuil can cause upset stomach, nausea, nervousness, constipation and dry mouth nose and throat. Adding meclizine could worsen some of these symptoms. The symptoms should wear off soon. If the symptoms persist see or call your doctor. Serious side effects include mental and mood changes such as confusion and hallucinations, shaking and trouble urinating. Sometimes allergic reactions can occur
Answered 5/7/2016
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