Nitric Oxide: The medication increases Nitric Oxide which causes vasodilation of erectile tissues. Erectile tissues are found in the temples of the head, lips, nose and penis. Try taking tylenol (acetaminophen) with your vigra or Cialis or Levitra or switching brands.
Answered 6/30/2014
5.5k views
Vasodilation: Drugs like cialis/viagra/etc cause expansion of the blood vessels/arteries in the body (vasodilation) which can result in a vascular headache in some people. Perhaps taking the med after a meal will ameliorate this effect.
Answered 9/28/2016
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