Cost: Branded Viagra is available starting at $ per dose. Generic Viagra is also available.If you are taking sildenafil for PAH, take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Continue to take sildenafil even if you feel well. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Do not take more or less of it or take it more often than prescribed by your doctor.How much does Sildenafil (Viagra) cost? To access savings, use a GoodRx coupon and pay just a fraction of the retail price. Viagra (brand) savings_outlined. GoodRx lowest price. $ Oval Tablet Imprinted With “” And “R”. Blue Oval And R – Sildenafil Citrate mg Tablet. View More expand_more. Viagra mg – Sildenafil Pills. To report any serious adverse events associated with the use of this drug. This drug is more popular than comparable drugs. It is available in generic and brand versions. The recommended dosage of Viagra for erectile dysfunction (ED) is 50 mg, taken as needed about 1 hour before sexual activity. You can take it 30 minutes to 4 hours before sexual activity. And you.Do not stop taking sildenafil without talking to your doctor. This site is intended only for U. Make sure you have discussed any other medications you are currently taking or plan to take before starting sildenafil with your doctor and pharmacist. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e.