Can un-prescribed Viagra cause heart problems?

In a healthy male, un-prescribed Viagra isn’t likely to cause any cardiac issues. But in men with heart problems – particularly if they take drugs to treat those heart problems – taking un-prescribed Viagra can be disastrous. It’s been known since Viagra first entered the market that men who take nitrates and other medications for heart problems should not take Viagra because it can cause blood pressure to plummet, with the result being fainting, heart attack, or worse. In fact, a man who takes any medication (prescription or over-the-counter) regularly needs to know if and how those products interact with Viagra in order to avoid problems.