I had rarp surgery in May 2025 and have been taking 5 mg cialis and daily a vacuum pump for penile rehab . Tried Trimix and had very painful reaction so switched to Bimix with good results. Started Bimix dosage of papaverine @ 30mg and phentolamine @ .5mg. At this dosage needed 45 units for usable erection. Urologist recommended changing dosage increasing the phentolamine to 1.5 mg. This increased dosage allowed me to get a usable erection with 15 units. Also, living in Tn had two pharmacy selections. Tried the pharmacy in Nashville and cost was $189 for one vile. Next refill ordered from pharmacy in Chattanooga and cost was $139 for 2 viles plus shipping! So good to work with urologist for best formula mix to minimize the number of units required and different pharmacy to get best price.