There may be a danger in high doses. Some of the side effects include anxiety, restlessness, rapid heart beat, and potential heart palpitations. Some people could have elevated blood pressure.
Yes, i sometimes take this for hayfever and travel sickness and it does make me drowsy
I keeps me awake... usually for most of the night. I take it in the morning and it still bothers me at night but it works for me and my allergies!
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