 [ Symptoms ] whait is the difference between 25 50 and 100mg viagra  i am 74 year old and i have erection problems i take 25mg viagra and it helps getting a strong erection but it doesnt last as soon as my partner stops stimulating me my penis loses its hardness could incrasing the dose to 50 or 100mg make a difference [ Disease ] maybe or you can try a different medication for erectile dysfunction ed before adjusting your dosage it is best to discuss this with your medical provider    someone who knows you and your medical history your medical provider may give the okay to try a higher dose to test your erectile sustainability or provide you with a trial of a different ed med to try when it comes to medication responses    any medication response    it often takes a trial of therapy