The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. The mean steady state volume of distribution Vss for sildenafil is L, indicating distribution into the tissues. When taken at the correct time and paired with sexual stimulation, the erection lasts long enough for successful intercourse. Keep from freezing. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. The changes from baseline in scoring on the two end point questions frequency of successful penetration during sexual activity and maintenance of erections after penetration were highly statistically significantly in favor of VIAGRA. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.20 mg sildenafil oral tablet from $ for 10 tablets 25 mg sildenafil oral tablet from $ for 30 tablets 50 mg sildenafil oral tablet from $ for 15 tablets mg . The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS Eligible patients may save on their VIAGRA® (sildenafil citrate) prescription with the VIAGRA savings card.  · The effects may be increased because of slower removal of the medicine from the body. Leukemia (blood related cancer) or. Multiple myeloma (blood related cancer) or. Sickle-cell anemia (blood disorder)—Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur.