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Notify your doctor if you take
caffeine or alcohol frequently, smoke, or if you use illegal drugs. These may
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In
case you experience a prolonged or painful erection for 4 hours or more,
contact your doctor without delay. This condition may require immediate medical treatment
to prevent tissue damage of the penis and potential permanent impotence.
If
you feel sudden loss of vision in one or both eyes, stay away from using it any
further and contact your doctor immediately.