The inability to obtain or sustain an erection strong enough for sexual engagement is the hallmark of ED. By investigating these possibilities, people can get the prescription drugs they need to treat their ED issues without having to pay a high price. Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. Instead of being used daily, Viagra should only be used as necessary. 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. For an extra fee, overnight shipping is available. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow.Fildena 25mg containing Sildenafil Citrate as its main constituent helps in relaxing the blood vessels for smooth blood flow into erectile tissues of male genital by inhibiting PDE-5 enzymes. This enzyme diminishes the blood flow in erectile tissues in male reproductive organ. After induction of c-GMP, nitric oxide inactivates the enzyme and. Common Viagra side effects may include: flushing (warmth, redness, or tingly feeling); headache, dizziness; abnormal vision (blurred vision, changes in color vision) runny or stuffy nose, nosebleeds; sleep problems (insomnia); muscle pain, back pain; or. upset stomach. This is not a complete list of side effects and others may occur.  · 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 taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed. Children—Use is not recommended.