You can take it in a small dose daily or in a larger dose as needed. They’re often the first line of treatment for trouble getting or keeping an erection, called erectile dysfunction ED. What you can do Take these steps to prepare for your appointment: Ask what you need to do ahead of time. Do not take it more than once a day. Alternative medicine Before using any supplement, check with your doctor to make sure it’s safe for you — especially if you have chronic health conditions. Lifestyle changes that can improve your sex life Before you start comparing ED meds , you may want to consider making small lifestyle changes to improve your erections. Dosage and strength for pulmonary hypertension Sildenafil tablets for pulmonary hypertension come in 10mg and 20mg strengths.Your doctor can prescribe VIAGRA if he or she thinks it’s right for you. VIAGRA OFFERS SAVINGS TO PATIENTS. If eligible, patients may save 50% on up to 12 prescriptions of brand-name VIAGRA annually–and could save up to $4, a year.* VIAGRA does not protect against sexually transmitted diseases, including HIV. The most common side. Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour. General information about the safe and effective use of VIAGRA. Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use VIAGRA for a condition for which it was not prescribed. Do not give VIAGRA to other people, even if they have the same symptoms that you have. It may .