Pfizer, the manufacturer of Viagra, offers a program that can help lower the cost of Viagra. For more information and to find out if you’re eligible for support, call or visit.The decision, Teva Canada Ltd. Sildenafil Viagra. This will increase the supply of blood to the lungs and reduce the workload of the heart. The patient addressed both questions at the final visit for the last 4 weeks of the study. Population pharmacokinetic data from patients in clinical trials also indicated a reduction in sildenafil clearance when it was co-administered with CYP3A4 inhibitors such as ketoconazole, erythromycin, or cimetidine [see Dosage and Administration 2. If you have an erection that lasts more than 4 hours, get medical help right away.The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing commitment to product quality and safety monitoring. Learn More. IF YOU CHOOSE BRAND-NAME VIAGRA, MAKE SURE YOU GET THE BRAND NAME. VIAGRA en Español. for Healthcare professionals: VIAGRA U.S. Physician Prescribing Information and U.S. Patient Product Information. How to take. Viagra vs. Cialis and other alternatives. Uses. FAQs. What to consider. Cost. Overdose. Ask your doctor. Q&A. Drug Images. What is Viagra? If you have erectile dysfunction (ED).Sildenafil at steady state, at a dose not approved for the treatment of erectile dysfunction 80 mg t. At the same time, on-treatment function was better in treated patients who were less impaired at baseline. You are encouraged to report adverse events related to Viatris products by calling U. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The frequency of patients reporting improvement of erections in response to a global question in four of the randomized, double-blind, parallel, placebo-controlled fixed dose studies patients of 12 to 24 weeks duration is shown in Figure 7. On 6 May , Pfizer , which manufactures Viagra, told the Associated Press they will begin selling the drug directly to people on its site. Sildenafil Viagra.