Thanks for writing to us.
You have been diagnosed to have Mitral Valve prolapse
and you are facing a problem of sustaining erection during intercourse.
Your erectile problem is not related to Mitral valve prolapse and could be due to anxiety
Do you have any symptoms due to mitral valve prolapse especially breathlessness on exertion.?
Are you taking any drugs that contain Nitrates for mitral valve prolapse.?
As regards taking Viagra
for erection, there is no harm in taking it provided you are not taking any drugs that contain Nitrates.
Please consult your Physician before you plan to start taking it.
Please feel free to ask if you have any more questions.
I shall be pleased to address the same .Thanks with Regards.