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This medicine is used for Angina pectoris
and taking another tablet should not cause any problem as usually it is tolerated well but still over dose can cause following nauseavomiting
,pain, burning, numbness, or tingling in any part of the body.
If anything is there consult your Physician and get an ECG to see that everything is fine specially QT interval.Other medicine can be taken.
You should consult your treating doctor certainly.
Hope this helps.
Dr.Akhilesh Dubey M.D.