If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Precautions It is important that you tell all of your doctors that you take sildenafil. These patients had erectile dysfunction at baseline that was characterized by median categorical scores of 2 a few times on principal IIEF questions. In a study of healthy male volunteers, co-administration of sildenafil at steady state 80 mg t. 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. Most will prescribe the 50mg tablet at first to patients who are just starting to take Viagra. It is not known if the medicine is safe for use in these patients.Most pharmacies in the UK, including Tesco and Boots, can now offer Viagra over-the-counter – called Viagra Connect. This is the same medication as prescription-only Viagra, but it is only available in the 50mg dose. Dr Fox is an online company that sells Viagra and other erectile dysfunction medication. They are a purely . Sildenafil (Viagra) is a medicine used to treat erectile dysfunction (ED, also called impotence). Sildenafil works by helping to relax the blood vessels in the penis, allowing more blood to flow in and cause an erection. You should take sildenafil about an hour before planned sexual activity, so it has time to work. Most men aged 18 and over can take sildenafil for erectile dysfunction. Most adults and children aged 1 year and over can take sildenafil for pulmonary hypertension. Who may not be able to take sildenafil. Sildenafil is not suitable for some people. To make sure it’s safe for you, speak to your doctor or pharmacist before taking sildenafil if you.