If your dose is different, do not change it unless your doctor tells you to do so. Visit Mayo Clinic Men’s Health to get started. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to take it. Your health information should remain between your provider and yourself. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. Most online providers require a picture of a valid ID, a selfie showing your face, and a recent blood pressure reading taken with a home blood pressure monitor or by a medical provider. Medicines that you take by mouth are called oral medicines.Best prices for generic viagra on the Internet! The safest way is to ask your physician to try an alternate prescription. Sildenafil 50mg Tablets are designed for men who are suffering from Erectile Dysfunction problems. Recall that it is necessary to strictly observe the rules for storing drugs in the refrigerator; some drugs cannot be frozen.  · Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. For non-prescription products, read the label or package ingredients carefully. Pediatric. Appropriate studies have not been performed on the . Sildenafil is used to treat erectile dysfunction (ED) and to reduce blood pressure in pulmonary arterial hypertension (PAH). It is taken when needed for ED and daily for PAH. A headache, stomach upsets, and flushing are the main side effects, and it should not be taken within 24 hours of a nitrate. 5. Tips.