Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Sildenafil comes as a tablet and suspension liquid to take by mouth. The online ED space has become crowded with telehealth platforms offering end-to-end ED treatment, from prescription all the way through delivery. The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. What should I do if I forget a dose?CR Best Buy Drugs recommends you review your medications with your doctor or pharmacist because antidepressants, blood pressure medicines, heartburn . AdDon’t go to the pharmacy without checking prices at GoodRx® first. No commitment or fees. Find the lowest price in your neighborhood & use our free coupons to save up to 80%Service catalog: Prescription Coupons, Prescription Discounts, Online Doctor Visits.  · a light-headed feeling, like you might pass out. Common sildenafil side effects may include: flushing (warmth, redness, or tingly feeling); headache, dizziness; heartburn, nausea, or upset stomach. abnormal vision (blurred vision, changes in color vision) runny or stuffy nose, nosebleeds; sleep problems (insomnia); or.