possible allergic reaction to med

I have been taking Norvasc, 10 mg per day for about a month.  I have been experiencing confusion, slurred speech, dimmed vision, malaise and edema in my legs.  Could I be allergic to the Norvasc.  I am also taking numerous other meds,, but these symptoms had not become apparent til recently.

[Cleveland Clinic]

The lower extremity edema and maybe the malaise can be attributed to the norvasc.  I am not sure about the dimmed vision, confusion and slurred speech.  That's more concerning for a TIA.  You should have this worked up further by a general internist or a cardiologist.  Probably an US of the carotid arteries should be done first to make sure there are no blockages there.