Sildenafil Tablet – Uses, Side Effects, and More Common Brand (S): Viagra Generic Name (S): sildenafil Uses Sildenafil is used to treat male sexual function problems (impotence or.Kidney disease, severe or Liver disease, severe—Use with caution. This medicine also works best when you take it an hour before sex on an empty stomach. Use only the brand of this medicine that your doctor prescribed. Check with your doctor immediately if any of the following side effects occur: Less common burning feeling in the chest or stomach burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feelings cloudy or bloody urine. Children younger than 1 year of age—Use and dose must be determined by your doctor.The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with ED. With ED, you. Viagra comes as tablets that are taken by mouth. In most cases, it should be taken about an hour before sexual activity, but it can be taken 30 minutes to 4 hours beforehand. Viagra is.Often, these are prescribed for chest pain called angina. Your doctor may adjust your dose as needed and tolerated. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. However the dose is usually not more than 40 mg 3 times a day. May make this condition worse. You can take this medicine with or without food 30 minutes before sex, depending on the dose. Avanafil Stendra.