Generally, the cost of generic ED medicines online is more than half the price of branded analogs. Lifestyle Changes It is possible to reduce the risk of erectile dysfunction through dietary changes, ceasing to smoke, and engaging in physical activity of any kind. Combining ED pills with these medications could potentially cause a dangerous decrease in blood pressure. Generic sildenafil may be ordered in packs of 14 and 28 tablets with a 50 mg dosage, while generic tadalafil is obtainable in packs of 9 and 18 tablets with a 10 mg dose. Seeking treatment for ED is essential for improving sexual health and overall well-being. It is important to consult a healthcare professional to determine the most suitable options. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes.In most males,* Viagra works within 1 hour after it’s taken. It’s possible that Viagra can begin working within 30 minutes of being taken. But other times, it may take up to 4 hours to start. Viagra should be taken at 25 mg per 48 hours in order to be used safely along with this drug, since ritonavir increases the concentration of Viagra. CYP3A4 inhibitors. Viagra should be taken at Side Effects. Dizziness, headache, flushing, or stomach upset may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may.