Make sure you have discussed any other medications you are currently taking or plan to take before starting sildenafil with your doctor and pharmacist. How should this medicine be used? The products discussed in this site may have different product labeling in different countries. This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids. Do not take a double dose to make up for a missed one. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire.AdFree 2-day Shipping On Millions of Items. No Membership Fee. Shop Now! AdPromescent® VitaFLUX is designed to support overall circulatory and sexual health. With powerful key amino acids like L-Arginine and L-Citrulline to increase overall health.  · Is Viagra prescribed in dosages of mg, mg, or mg? The highest recommended Viagra dose for treating erectile dysfunction (ED) is mg per day, according to the drug’s manufacturer.