This is Dr. David
you should only get a prescription for viagra from your physcian
and your physician should make sure your heart and body are strong enough for sexual function
you should get blood test to check your testosterone levels to make sure they are normal levels for you.
Viagra can drop your blood pressure and cause headaches and dizziness as a side effect so you have to be careful when you take it that your blood pressure doesn't drop too much when you take blood pressure medications like lisinopril.
sexual activity can cause your PSA to temporarily become elevated. so make sure you avoid sex for 3-5 days prior to getting your PSA levels checked for your prostate cancer
most likely you will be able to take viagra without problems to help improve your erectile function
let me know if you have other questions.
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