There are a variety of conventional and alternative ways to address ED, and a combination of treatments that address the factors contributing to the condition can help people address their symptoms. Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. Children younger than 1 year of age—Use and dose must be determined by your doctor. If you need emergency medical care for a heart problem, it is important that your doctor knows when you last took sildenafil. These drugs can augment erectile function and be used without ED medication or provide a more robust response with ED medication. Follow your doctor’s orders or the directions on the label.It depends on a few factors, including your age and why you’re taking it, since Viagra is not only used to treat ED. Your doctor will tell you how much you should take. For help with erections. AdMany Americans pay far too much for their prescriptions. We’re here to help. Compare pharmacy prices in your area, get the free coupon, & see how much you can save!5-Star Reviews · No Credit Card Required · Over 70k Pharmacies · Prescription DiscountsTypes: Sildenafil · Erection Problems · Erectile Dysfunction. 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.