For any old gent with a heart condition and carrying around nitroglycerine tablets "just in case," be aware that taking one of those while you are on Cialis or Viagra can drop your blood pressure dangerously (possibly fatally) low and there is not a thing the doctors can do to stop it or reverse it.
Yes...Nitro...or other Nitrates are very dangerous in combination with PDE5-Inhibitors, therefore it can happen, that the Joy-giving-ladies have finally a dead customers in their arms.
Well, if the Viagra or Cialis does the trick and the thrill brings on chest pains, man up and endure it and resist the urge to pop a nitro pill.