The question should not involve taking the nitro, but a clear description of the symptoms you are experiencing that prompt you to take the medication. Excessive use of nitro will not kill you, howeever the cells become acustomed to the substance and may not dilate as strongly. If you have unstable angina, use of nitro isd not contraindicated. Maybe yes, maybe no. The answer to your question depends on many factors, and only your cardiologist is qualified to ptrovide you with the answer you seek.
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