Some of the more common side effects linked to sildenafil include headache, facial flushing, a stuffy nose, visual changes or dizziness. Find out some of the pros and cons of these companies here. Why are there different Viagra dosages for ED? Online pharmacies such as GoodRx are also helping bring down the costs of erectile dysfunction medications. The Sildenafil 25mg dose can be a good starting point for men over the age of 65 with other medical conditions. The strongest dose of Cialis is 20mg while the strongest Viagra pill is mg. Is Viagra mg more effective?Sildenafil mg is the highest dosage on offer to treat ED. But don’t go thinking that you need the highest dose in order to have the hardest erections, because that isn’t how it . BlueChew vs. Hims: Chewable Viagra to Try in Medically reviewed by Alexandra Perez, PharmD, MBA, BCGP BlueChew and Hims both offer chewable versions of ED . What erectile dysfunction pills are available? In addition to Viagra, other ED drugs available in the United States include avanafil (Stendra), tadalafil (Cialis) and vardenafil .