Patients should always ask their doctors for medical advice about adverse events. The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color vision such as having a blue color tinge and blurred vision; stuffy or runny nose; back pain; muscle pain; nausea; dizziness; rash. A starting oral dose of 25 mg should be considered in those patients [see Dosage and Administration 2. At the same time, on-treatment function was better in treated patients who were less impaired at baseline. A stronger CYP3A4 inhibitor such as ketoconazole or itraconazole could be expected to have greater effect than that seen with saquinavir.Sildenafil citrate is a white to off-white crystalline powder with a solubility of mg/mL in water and a molecular weight of VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg and mg of sildenafil for oral administration. Walmart, actualmente, tiene el precio más bajo de las tres tiendas para Viagra en $ Walmart pone un precio al sildenafilo genérico a $, mucho más bajo que el medio nacional de $ Sobre Viagra y sildenafilo. Efek Samping dan Bahaya Viagra. Berikut adalah beberapa efek samping yang mungkin muncul setelah mengonsymsi Viagra: Pusing atau sakit kepala. Wajah, leher, atau dada terasa panas atau memerah (flushing) Sulit membedakan warna atau pandangan kabur. Mimisan, hidung tersumbat, atau justru meler.