12. When is it safe to use sildenafil with nitrates?

A. Nitrates can be used 24 hours after sildenafil

B. Nitrates are safe to use simultaneously with sildenafil

C. Nitrates can be used 12 hours after sildenafil

D. NItrates are safe to use simultaneously with sildenafil as long as an alpha blocker is not also being used.

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