Yes, ED pills can cause side effects. Recent heart or blood vessel problems. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Payment options: Consider how you’d like to pay.Print Products and services Erectile dysfunction: Viagra and other oral medications By Mayo Clinic Staff Medicines that you take by mouth are called oral . Best Low Cost: GoodRx Fastest Delivery: Blink Health: Sesame Sign Up Now Key Specs Cost: Consultation prices vary based on the prescriber; $5 generic .  · Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be .