I am a senior,I can use 25mg viagra,I have had what the ddoctor calls a small heart attack,I have a nitro patch on in the day time.What I want to know is if I take my patch off at night and do not put one on the next day that would leave me say 20-24 hours without the patch would I be able to use 25mg viagra for easy sex hope you can help me I am not ready to give up on good times yet Bill