My doctor prescribed 20mg for my ED.. Being cautious, and having read how 5mg works so well for others, I cut my c20 pill in half.. Worked great, and with the high cost of the drug, this seems like a good idea.. I'll ask my Dr about trying 5mg (to save money) but for now, will cut my c20s into halves.. Just wish cutting them wasn't so fussy.. I do use a pill cutter.. Anyone else cutting 20mg pills?